Team:Paris Bettencourt/Notebook/Eliminate Smell

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Revision as of 09:20, 10 September 2014

Eliminate Smell



Notebook

June

June 11th

Goal: Design plasmids that express agaA construct

Procedure:

Using Geneious, we first created the agaA construct:

  • Promoter BBa_J23108 from the Anderson's promoter collection
  • RBS from the RBS Calculator of Salis lab specific for E coli
  • BioBrick Prefix + Scar from the iGEM Parts webpage
  • agaA sequence codon optimized for E coli 12 (IDT online tool). We checked with Generious that there were no restriction sites for EcoRI, SpeI, ZbaI and PstI.
  • Histidine tag: 6 Histidines in C-terminal were added
  • Stop codon
  • BioBrick scar + BioBrick suffix from the iGEM Parts webpage


To amplify this construct, we created two oligos:

NameSequence (5'->3')NotesBinding position
oPB.001TATAGAATTCGCGGCCGCTTCTAGAGTGACAGCTAGCTCAGTCCTAGGagaA forward for BioBrick vector1->23
oPB.002-BAD PRIMERGAAGCATCATCACCATCACCACTGATACTAGTAGCGGCCGCTGCAGTTAagaA REVERSE for BioBrick vector- NOT REVERSED1272->1296
oPB.005TTAACTGCAGCGGCCGCTACTAGTATCAGTGGTGATGGTGATGATGCTTCagaA reverse for BioBrick vector1272->1296

* We noticed the 16/06/2014 that oPB.002 was NOT reversed and we designed oPB.005


Tip: When creating oligos: we add 4 nt at the beginning and the end composed by AT, to make sure the enzyme will bind properly.


We chose two backbones for the construct:

  • pSB1C3 from the iGEM Parts to create a BioBrick.
  • pEC-XC99E, a E coli-C glutamicum shuttle plasmid

We designed two plasmids:

1. pPB.001: Biobrick submission of agaA expression construct


1) Plasmid pSB1C3: High copy BioBrick assembly plasmid. Constitutive expression. To use in E coli


2) agaA construct

2.pPB.002:agaA expression construct. Shuttle vector E coli-C glutamicum

1) Plasmid pEC-XC99E modified: Ptrc (IPTG inducible promoter) and lacI will be removed by PCR. Primers will be oPB.003 -that includes a PstI site- and oPB.004 -that includes a XbaI site.

oPB.003 5'-CTGCAGATGCAAGCTTGGCTGTTTTGGCG-3' PstI site + agaA forward for pEC-XC99E
oPB.004 5'-TCTAGACACCACCCTGAATTGACTCTCTTC-3' XbaI site + aga reverse for pEC-XC99E

2) agaA construct

June 16th

Goal: Design new reverse oligo for Biobrick construction

Procedure:

We noticed oPB.002 was NOT reverse and therefore could not be used. We created oPB.005 instead:

oPB.005 5'-TTAACTGCAGCGGCCGCTACTAGTATCAGTGGTGATGGTGATGATGCTTC-3' agaA reverse for BioBrick vector
1272->1296
June 23rd

Goal: PCR agaA gBlock with oPB.001 and oPB.005

Procedure:
We are going to PCR using the DreamTaq polymerase protocol the agaA gBlock with the forward primer oPB.001 and the reverse primer oPB.005. These two oligos include the BioBrick prefix and suffix. The aim is to add the prefix and suffix to the agaA sequence and amplify it.

We will set the parameters in the machine and run the reaction overnight.

June 24th

Goal: PCR purification of the gBlock

Procedure:

We will purify the PCR product -agaA gBlock that contains prefix-agaA-suffix- obtained on June 23rd following the QIAquick PCR purification kit standard protocol .

We will run a 1% agarose gel with the purified DNA following the standard protocol . Gels were made by Ihab and Antonio the 23rd of June following the same protocol.

Results
After running the gel, we exposed it in UV light. We could see the Gene Ruler, but there was no band in our sample.

We think that PCR did not work. Things to change:
  • Use fusion polymerase, as it is more reliable than the DreamTaq we used. DreamTaq is more for colony PCR.
  • Final concentration of 200 uL, to have more DNA
  • When PCR does not work we look at:
    • Annealing temperature: we start typically at 52ºC and can go down to 50ºC.
    • DMSO concentration: typically 3%. Avoids missmatching
    • Extension time, according to the manufacturer

Goal:PCR agaA gBlock with oPB.001 and oPB.005

Procedure:

We are going to PCR using the Fusion Polymerase for the agaA gBlock with the forward primer oPB.001 and the reverse primer oPB.005. These two oligos include the BioBrick prefix and suffix. The aim is to add the prefix and suffix to the agaA sequence and amplify it.

June 25th

Goal: PCR purification of the gBlock

Procedure:

We will purify the PCR product -agaA gBlock that contains prefix-agaA-suffix- obtained on June 24th following the QIAquick PCR purification kit standard protocol .

We will run a 1% agarose gel with the purified DNA following the standard protocol . Gels were made by Ihab and Antonio the 23rd of June following the same protocol.
Results:


- 1st raw: Gene Ruler 100 kb + 1uL Loading Dye
- 2nd and 3rd raw: purified PCR products + 1 uL of Loading Dye per 5 uL of sample. We saw the samples did not sink properly in the hole, so we tried using more Loading Dye (raw 2 is tube A, raw 3 is tube B)
- 4th and 5th raw: 2 uL of Loading Dye for 5uL of sample (raw 4 is tube A, raw B is tube B)

We can see our construct around the 300 bp line, so we know is the gBlock.

Me measured the DNA in the samples using the Nanodrop.
- Tube A: 100 ng/uL
- Tube B: 55 ng/uL. This is a little low. It is an unexpected result considering that we pepared both tubes at the same time and following the same protocol.

June 26th

Goal: Obtain pPB.001 (agaA gBlock digestion + ligation)

Procedure:

We will digest the purified agaA gBlock following the Thermo Fast Digestion Protocol for enzimes EcoRI and PstI. Then we will ligate it with the linearized vector pSB1C3. We want to obtain pPB.001 and transform E coli.

Digestion

1) We will use tube A (100 ng/uL). We added 20 uL of water + 5 uL Buffer + 20 uL DNA + 2.5 uL EcoRI + 2.5 uL PstI. We digested longer than indicated, around 40 minutes, as we have used these enzymes before and work better this way.

2) Then we put it at 37ºC at the Isotemp for 5 min.

3) We will repeat for PSB1C3

These tubes were called Digested gBlock and Digested PSB1C3

Purification

4) We will purify both tubes using the QIAquick kit .

These tubes were called Dig + Pur gBlock and Dig + Pur PSB1C3

Ligation

Following the Thermo T4 DNA Ligase protocol . Instead of leaving the tube at 22ºC for 10 min, we left it at room temperature for 45 min.

5) We will make a ligation. We will make a 1:3 proportion for the gBlock:vector. We added 3,3 uL of the linearized vector [25 ng/mL] and 2,5 uL of the insert DNA [100 ng/mL].

Purification

6) We will purify the product using the QIAquick kit .

This tube was called pPB.001

Goal: Transform E coli with pPB.001

Procedure:

We will transform competent E coli that were previously made by Jake following his own protocol. We will use pPB.001 .
We will follow this Heat Shock protocol .
We will plate them in LBA+Cm. We will add 250 uL of Cm for 250 mL of LBA.

Results:

No colonies grew after 12h. We will leave them in the incubator some more time and repeat the Heat Shock in the meanwhile


June 27th

Goal: E coli transformation with pPB.001

Procedure:
Because the plates cultured on June 26th have no colonies after 12h, we have decided to repeat the heat shock transformation. The mistake might be that we are using Cloroamphenicol, and we did not recover them for enough time. We recovered them during 50 min in the thermocycler.

Today we have repeated the same Heat Shock protocol , but we have recovered them during 2h in the incubator. The cells used were a new stock from Jake's competent E coli. The plasmid used is pPB.001 .

Then we will plate them in LBA+Cm

Results:
We still have no colonies in the plates.
What might not work:
- Enzimes (EcoRI and PstI) work, as Ihab and Antonio have tested them. However I am cutting a linearized plasmid, so if their efficiency is not very high, they might not work for me.
- Ligase.
- Transformation. I doubt it
- Primers are not well designed

June 29th

Goal: Start culture to extract plasmid

Procedure:

We will start a culture to extract the plasmid PSB6A1 (Matt's stock, 2013). The aim is to cut a circularized plasmid with EcoRI and PstI and check their efficiency.

We cultured the cells in LBA+Amp at 37ºC

June 30th

Goal: Miniprep to extract a plasmid (unfinished)

Procedure:

We started a culture on June 29th. We will make a mini prep following the Mini Prep protocol. The aim is to extract the plasmid PSB6A1 to cut it with EcoRI and PstI and see the efficiency of the cut.


Results:

We have found out that Antonio and Ihab have already tested PstI and EcoRI. They seem to work quite specifically .

Also, they haven't managed to construct the plasmid, or do the Golden Gate assembly . We believe this is due to the Ligase and/or the Ligation buffer.

Therefore, we will use a new enzyme and buffer, ligate and transform.

Most enzymes from last year do not seem to work. We shoud not use them and wait for the new ones.

July

July 1st
Goal: PCR purification of the gBlock

Procedure:


July 1st

** pEC-XC99E plasmids (Cm) from the Beilfield iGEM team arrived today. We stored them at 37ºC and Pierre-Luc will make a miniprep tomorrow **
Goal: Obtain pPB.001

Procedure:

We will use the digested agaA gBlock and PSB1C3 obtained on June 26th .

Ligation

We will use a new Ligase from Promega (Jake's stock) for this experiment, as the former one (from iGEM's 2013 stock, Thermo) did not seem to work.

We will follow the Promega T4 DNA Ligase protocol. It is recommended to leave the tubes at room temperature for 3h but instead we did it for 2h.

We will make a 1:3 proportion for the gBlock:vector. We added 3,3 uL of the linearized vector [25 ng/mL] and 2,5 uL of the insert DNA [100 ng/mL].

Purification

We will purify the product using the QIAquick kit .

Tip: It is better to purify with water, as the Ligase might be sensitive to the Elution Buffer (EB), that has a lot of salts on it. Last time (June 26th), we did use the EB Buffer.

This tube was called pPB.001


Goal: Transform E coli with pPB.001

Procedure:

We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use pPB.001 .
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm. We will add 250 uL of Cm for 250 mL of LBA.

Results:

We are still not able to transform the cells. We went back to check the primers, and the oPB.001 that we have in the database and the one we commanded are not the same.

We will re-do this process with the good oPB.001 when it arrives. At least now we have learnt all the techniques. Always re-check your plasmids, many times.


July 2nd
Goal: Miniprep to extract pSEVA351 + Glycerol stock

Procedure:

We recieved a tube that contains pSEVA351 (sent by the CSIC).We cultured it the night before, and extract a colony. We put a mixture of this colony + 5ml of LB medium in 2 different tubes.

We will let it grow overnight at 37ºC.
- Tube 1: miniprep following the standard protocol. This tube will be pSEVA351 and it is in my own stock.
- Tube 2 : glycerol stock: 250 uL of glycerol 60% + 750 uL of the culture. We will have both a -20ºC and -80ºC stock.

This is the vector we will use to construct pPB.003 .

July 11th
Goal: PCR of agaA gBlock with oPB.001 and oPB.005

Procedure:

We are going to PCR using the

Fusion Polymerase

for the agaA gBlock with the forward primer

oPB.001

(the good one this time!) and the reverse primer

oPB.005.

These two oligos include the BioBrick prefix and suffix. The aim is to add the prefix and suffix to the agaA sequence and amplify it.


July 12th and 13th
Goal: PCR purification of the gBlock

Procedure:

We will purify the PCR product -agaA gBlock that contains prefix-agaA-suffix- obtained on July 11th following the QIAquick PCR purification kit standard protocol .

We will run a 1% agarose gel at 50V with the purified DNA following the standard protocol .

The gel was put in a solution of Ethidium Bromide for 10 minutes.
Results:


-

1st raw:

Ready-to-use Gene Ruler (includes Loading Dye) 100 kb (5 uL)*

- 2nd raw: 5 uL purified PCR products + 1 uL of Loading Dye per 5 uL of sample (PCR product obtained the 11th of July and purified the 12th of July).

This is strange. I am confident that my PCR product is fine. I will repeat it with a different Gene


-

1st raw:

Ready-to-use Gene Ruler (includes Loading Dye) 100 kb (5 uL)*

- 2nd raw: 4uL Gene Ruler + 1 uL Loading Dye 100 kb*
- 3rd raw: 5 uL purified PCR products + 1 uL of Loading Dye per 5 uL of sample (PCR product obtained the 11th of July and purified the 12th of July).

*We used these two because Ready-to-Use seems not to work fine.

We see that it was the 'Ready-to-Use Gene Ruler' that did not work properly. Our PCR worked fine and our construct is about 300 bp. Even if this is not at all a good image, as we are only trying to check if the PCR runned properly I will not repeat it. We saw in the other gel that there is a clear band. In this gel we can see that this band is 300 bp.


Goal:Obtain pPB.001

Procedure:

We will digest the purified agaA gBlock following the Thermo Fast Digestion Protocol for enzimes EcoRI and PstI. Then we will ligate it with the linearized vector pSB1C3. We want to obtain pPB.001 and transform E coli.

We measured the purified aga gBlock in the nanodrop, the concentration was 50 ng/mL. This is low. I do not know if it is low because I am measuring the purification product instead of the direct PCR product.

Digestion

1) We added 20 uL of water + 5 uL Buffer + 20 uL DNA + 2.5 uL EcoRI + 2.5 uL PstI.

2) Then we put it at 37ºC at the Isotemp for 5 min.

This tubes was named Digested agaA gBlock


Purification

4) We will purify the tube using the QIAquick kit .

This tube was called Dig + Pur agaA gBlock

Ligation

We ligated Dig+Pur PSB1C3 (June 26th) and Dig+Pur agaA gBlock (July 12th)

Following the Thermo T4 DNA Ligase protocol . Instead of leaving the tube at 22ºC for 10 min, we left it at room temperature for 45 min.

5) We will make a ligation. We will make a 1:3 proportion for the gBlock:vector. We added 3,3 uL of the linearized vector [25 ng/mL] and 7 uL of the insert DNA [50 ng/mL].

The protocol says to leave the ligation for 10 min, but we left if for 20 min at room temperature. The tube is called Ligation pPB.001.


Goal: Transform E coli with pPB.001

Procedure:

We will transform competent E coli that were previously made by Jake following his own protocol. We will use pPB.001.

We will follow this Heat Shock protocol . We made two transformations (two tubes following the same protocol)
We will plate one of the tubes in an LBA+Cm plate. We will leave the other tube in the incubator overnight and plate it the day after. For each tube, we always plate 20 uL in one plate and 200 uL in another one.

Results:

On July 13th we can see what seems a colony in one of the plates. We will see tomorrow.

On July 14th we see colonies.


July 14th
Goal:Culture Corynebacterium glutamicum and Corynebacterium striatum

Procedure:

We will open the flask that arrived and culture Corynebacterium in Tryptophan Soy liquid medium at 37ºC overnight. After, we will plate them and culture single colonies to make competent cells and transform them. Corynebacterium glutamicum is sPB.006 and Corynebacterium striatum is sPB.007.


Goal:Obtain pPB.001 (Digest pSEVA351 + ligate with agaA gBlock)

Procedure:


We will digest pSEVA351 following the Thermo Fast Digestion Protocol for enzimes EcoRI and PstI. Then we will ligate it with the agaA gBlock. We want to obtain pPB.003 and transform Corynebacterium glutamicum and Corynebacterium striatum.

We measured the purified aga gBlock in the nanodrop, the concentration was 50 ng/mL. This is low. I do not know if it is low because I am measuring the purification product instead of the direct PCR product.

Digestion

1) We added 20 uL of water + 5 uL Buffer + 20 uL DNA + 2.5 uL EcoRI + 2.5 uL PstI.

2) Then we put it at 37ºC at the Isotemp for 5 min.

This tube was named Digested pSEVA351


Purification

4) We will purify the tube using the QIAquick kit .

This tube was called Dig + Pur pSEVA351

Ligation

We ligated Dig+Pur agaA gBlock (July 12th) and Dig+Pur pSEVA351(July 14th)

Following the Thermo T4 DNA Ligase protocol . Instead of leaving the tube at 22ºC for 10 min, we left it at room temperature for 45 min.

5) We will make a ligation. We will make a 1:3 proportion for the gBlock:vector. We added 3,3 uL of the linearized vector [25 ng/mL] and 7 uL of the insert DNA [50 ng/mL].

The protocol says to leave the ligation for 10 min, but we left if for 20 min at room temperature. The tube is called Ligation pPB.003.

July 16th
Goal: Colony PCR: Check pPB.001 transformation

Procedure:

Yesterday July 15th Juanma runned a colony PCR with oPB.001 and oPB.005 using the

Phusion Polymerase protocol

. Today we will run a 1% agarose gel with the purified DNA following the

standard protocol

.


Results:

There are no bands on the gel. This might happen with Colony PCR. To double-check, we will do a MiniPrep to extract pPB.001 and run a PCR with oPB.001 and oPB.005.
Goal:Make competent Corynebacterium

Procedure:

We will use the eppendorf protocol ( https://docs.google.com/file/d/0By8yVXC0fFVRMTlDd3BxQXM2Y1U/edit ) for making competent cells, but when growing them overnight, we will follow Haynes and Britz protocol (The effect of growth conditions of Corynebacterium glutamicum on the transformation frequency obtained by electroporation). We did this because its been proven that adding glycine to the medium overnight increases the electrotransformation efficiency. This is the different part of the protocol:

Procedure:
Cells were grown for approximately 18 h at 30ºC in a rotary shaker at 200 r.p.m. in 400 ml LB supplemented with kanamycin (50 pg ml-l) and glycine (2.5%).


July 17th
Goal:Check transformation of E coli with pPB.001 (MiniPrep + PCR + Gel)

Procedure:

MiniPrep
We will extract pPB.001 by making a MiniPrep of the 8 colonies following the standard protocol.

PCR
We will run a PCR with oPB.001 and oPB.005 following the Phusion Polymerase protocol . And we will run a 1% agarose gel with the purified DNA following the standard protocol .

Results:

Again, no bands.


Goal:Make competent Corynebacterium + Transform Corynebacterium with pSEVA

Procedure:

We will use the eppenforf protocol (https://docs.google.com/file/d/0By8yVXC0fFVRMTlDd3BxQXM2Y1U/edit)


Results:

There are a lot of colonies for sPB.007. In both plates. We will check that there is an insert. for that, we have started a culture (July 20th) and we will PCR it tomorrow.


July 18th
Goal:Check transformation of E coli with pPB.001

Procedure:

Using the MiniPrep we got on July 17th, we will do a digestion analysis: (Jake's recipe)
- 5 uL plasmid
- 2 uL Fast Digest Green (has LD in it)
- 1 uL NotI or EcoRI+PstI. We used EcoRI+PstI as it was impossible to find NotI.
- 13uL of H2O

(Final volume of 20 uL)

We will incubate for 15-30 min at 37ºC. Then we will run 10 uL (our Fast Digest Green buffer already has Loadyng Dye in it, so no need to add more) in an agarose 1% gel.

Results:

The gel is empty. We cannot even see the vector.


July 20th
Goal: Ligate pPB.001 + E coli transformation

Procedure:

Ligation
We will use the digested agaA gBlock and PSB1C3 obtained on June 26th .

We will follow the Thermo T4 DNA Ligase protocol . I think last ligation did not work because it was too hot in the lab. This time, I will leave the ligation product for 30 min in the dark room (20ºC).

E coli transformation
We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use pPB.001 obtained today.
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm.


Results:

There were no colonies 48h after.


August


August 1st
Goal: Check E coli transformation with pPB.001 (miniprep + digestion)

Procedure:

Ligation
We will use the digested agaA gBlock and PSB1C3 obtained on June 26th .

We will follow the Thermo T4 DNA Ligase protocol . I think last ligation did not work because it was too hot in the lab. This time, I will leave the ligation product for 30 min in the dark room (20ºC).

E coli transformation
We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use pPB.001 obtained today.
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm.


Results:

There are colonies on the plate. We will culture, miniprep and digest them.


August 5th
Goal: Check E coli transformation with pPB.001 and Corynebacterium transformation with pSEVA +

Procedure:

MiniPrep
We will extract pPB.001 by making a MiniPrep of the 8 colonies + the new E coli transformation (July 20th) + Corynebacterium transformed with pSEVA following the standard protocol.

In the nanodrop, we saw that the yield for the 8 colonies was way too low (10 ug/mL) so we discarded them. We will continue with the E coli transformed on July 20th (37 ug/mL) + Corynebacterium transformed with pSEVA (117 ug/mL).

Digest
Using the MiniPrep we got on July 17th, we will do a digestion analysis: (Jake's recipe)
- 5 uL plasmid (for the Ecoli we used 10 uL and added less water)
- 2 uL Fast Digest Green (has LD in it)
- 1 uL NotI or EcoRI+PstI. We used EcoRI+PstI
- 13uL of H2O

(Final volume of 20 uL)

We will incubate for 15-30 min at 37ºC. Then we will run 10 uL (our Fast Digest Green buffer already has Loadyng Dye in it, so no need to add more) in an agarose 1% gel.

Results:


-

1st raw:

Gene Ruler 100 kb + 1uL Loading Dye

- 2nd raw: Corynebacterium striatum transformed with pSEVA
- 3st raw: E coli transformed with pPB.001. However it weights 5000 kb. We go back to our protocol of August 1st and in fact what we have here is E coli transformed with pSEVA.


Conclusions:

Looking at this gel:
- We should not have used the 100 kb rule but the 1 kb
- Corynebacterium has not been transformed
- When we run at 100 V, the gel looks worse

Goal: Corynebacterium striatum transformation with pSEVA

Procedure:

We will use the eppenforf protocol (https://docs.google.com/file/d/0By8yVXC0fFVRMTlDd3BxQXM2Y1U/edit)


Results:

There are a lot of colonies in the plate. We will strike them to pick single colonies and check the transformation.


August6th
Goal: pPB.001 ligation

Procedure:

We are going to check our ligation product in a gel to see what is going on. Last time, the problem is that I used pSEVA to transform.

Ligation
We will use the digested agaA gBlock and pSB1C3.

We will follow the Thermo T4 DNA Ligase protocol .

We runned 5 uL of the digestion product in a 1% agarose gel. We used 2 uL to transform E coli. The rest of the tube was kept at 4ºC. If the transformation goes wrong, we will use it tomorrow to transform again.


Goal: Transform E coli with pPB.001

Procedure:

We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use pPB.001 .
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm. We will add 250 uL of Cm for 250 mL of LBA.


Results:

There are colonies in the plate. We made a sub culture to pick single colonies on August 6th. On August 7th we made a liquid culture to then miniprep it and check the transformation.


August 7th
Goal:Obtain pPB.001 (agaA gBlock digestion + ligation)

Procedure:

We will digest the purified agaA gBlock following the Thermo Fast Digestion Protocol for enzimes EcoRI and PstI. Then we will ligate it with the linearized vector pSB1C3. We want to obtain pPB.001 and transform E coli.

Digestion

1) We are using the agaA working stock. We added 20 uL of water + 5 uL Buffer + 20 uL DNA + 2.5 uL EcoRI + 2.5 uL PstI.

2) Then we put it at 37ºC at the Isotemp for 1h30 (instead of 5 min).

3) We will repeat for PSB1C3, using the 'plasmid DNA' protocol.

These tubes were called Digested gBlock and Digested PSB1C3

Purification

4) We will purify both tubes using the QIAquick kit .

These tubes were called Dig + Pur gBlock and Dig + Pur PSB1C3

Ligation

Following the Thermo T4 DNA Ligase protocol . Instead of leaving the tube at 22ºC for 10 min, we left it at room temperature for 45 min.

5) We will make a ligation. We will make a 1:3 proportion for the gBlock:vector. We added 3,3 uL of the linearized vector [25 ng/mL] and 2,5 uL of the insert DNA [100 ng/mL].

Purification

6) We will purify the product using the QIAquick kit .

This tube was called pPB.001


Results:

In the nanodrop, we have seen that the concentration of both our vector and insert is 2 ng/mL. This is very low for ligation. This might be the reason why ligation does not work: not enough DNA.

Next step:
- Take PSB1C3 from the BioBrick parts, clone it into E coli
- Miniprep
- Use this PSB1C3 to obtain pPB.001

Goal:Check transformation in Corynebacterium

Procedure:

We picked 2 single colonies and incubated them in LB at 37ºC overnight.


Goal:Glycerol stock for E coli with pSEVA

Procedure:

We added 750 uL of culture and 250 uL of Glycerol 60% and stock them in the common box at -20ºC and some other tubes at -80ºC.


August 8th, 10th and 11th
Goal:Check Corynebacterium transformation with pSEVA

Procedure:

MiniPrep
We will extract pPB.001 by making a MiniPrep of 2 colonies of Corynebacterium transformed with pSEVA following the standard protocol.

In the nanodrop, we saw that the yield for colony 1 was 80 ng/uL and colony 2 had 170 ng/uL

Digest
Using the MiniPrep we got on July 17th, we will do a digestion analysis: (Jake's recipe)
- 5 uL plasmid (for the colony 1 we used 10 uL and added less water)
- 2 uL Fast Digest Green (has LD in it)
- 1 uL NotI (we have checked that it makes two cuts in pSEVA, so we will see two bands)
- 13uL of H2O

(Final volume of 20 uL)

We will incubate for 15-30 min at 37ºC. Then we will run 10 uL (our Fast Digest Green buffer already has Loadyng Dye in it, so no need to add more) in an agarose 1% gel.

Goal: Obtain PSB1C3 and clone it in E coli

Procedure:

We will take PSB1C3 from the DNA Kit Plate and clone it into E coli. Then, we will make a culture, grow it overnight and miniprep it tomorrow. This was, we will obtain PSB1C3 in a much higher concentration than we had in the linearized version.

It is on the Spring 2014 Plate 4, 4B

DNA Kit Plate Instructions

Before you use the DNA in the Distribution Kit Plates, be sure to test the efficiency of your competent cells with the Transformation Efficiency Kit.

To use the DNA in the Distribution Kit, follow these instructions:
Note: There is an estimated 2-3ng of DNA in each well, following this protocol, assume that you are transforming with 200-300pg/ul

  1. With a pipette tip, punch a hole through the foil cover into the corresponding well of the part that you want. Make sure you have properly oriented the plate . Do not remove the foil cover, as it could lead to cross contamination between the wells.
  2. Pipette 10uL of dH2O (distilled water) into the well. Pipette up and down a few times and let sit for 5 minutes to make sure the dried DNA is fully resuspended. We recommend that you do not use TE to resuspend the dried DNA.
  3. Transform 1ul of the resuspended DNA into your desired competent cells, plate your transformation with the appropriate antibiotic* and grow overnight.
  4. Pick a single colony and inoculate broth (again, with the correct antibiotic) and grow for 16 hours.
  5. Use the resulting culture to miniprep the DNA AND make your own glycerol stock (for further instruction on making a glycerol see this page). We recommend using the miniprepped DNA to run QC tests, such as restriction digests and sequencing.

* To know which antibiotics to use, look at the plasmid that the part is in. The naming scheme for plasmids is specifically designed to indicate antibiotic resistance.

Note: There is not enough DNA in each well to perform anything but transformations


Transformation

We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use PSB1C3 obtained today from the DNA Kit Plate.
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm. We will add 250 uL of Cm for 250 mL of LBA. I forgot to do it on the afternoon, so I did it on the 9th and the 10th I started a culture for miniprep.


Results:

div> I have too many colonies and they do not look red, just redish. So two things:
- Strike a sample in another plate to see single colonies (August 10th) - Plate 1
- Do a new transformation (August 10th) - Plate 2

August 11th - We see colonies in both plates, but in Plate 1 they are bigger and express very intensly RFP. So we took a colony from this plate to miniprep and extract PSB1C3.

August 12th
Goal:pPB.001 with new PBS1C3

Procedure:

Today is fun day.

1) Miniprep E coli culture
We will extract PSB1C3 by making a MiniPrep of the colony of E coli we transformed following the standard protocol.

In the nanodrop, we saw that the yield was 253,3 ng/uL

2) Digest PBS1C3
We will digest the purified agaA gBlock following the Thermo Fast Digestion Protocol for enzimes EcoRI and PstI. Then we will ligate it with the linearized vector pSB1C3. We want to obtain pPB.001 and transform E coli.

We digested two tubes. We used the protocol for Genomic DNA because it has worked for some colleagues that are doing the same, and I would like to have a big amount of final volume.

We will digest for 2h. We added 20 uL of PSB1C3 (we wanted to have 5 ug), so we used 10 uL less of water.

We called these tubes Dig PSB1C3.

3) Purify PBS1C3 with sticky ends in a gel
We run an agarose gel at 1%, cut the region of PSB1C3 and make a gel purification using the kit.

4) Ligate PSB1C3 with the gBlock
Following the Thermo T4 DNA Ligase protocol . Instead of leaving the tube at 22ºC for 10 min, we left it at room temperature for 45 min.

We will make a ligation. We will make a 1:3 proportion for the gBlock:vector. We added 6,6 uL of the PSB1C3 vector [11.3 ng/uL] and 2,5 uL of the insert DNA [100 ng/uL].

5) Purification
We will purify the product using the QIAquick kit .

This tube was called pPB.001

6) Transform pPB.001 in E coli
We will transform competent NEB turbo E coli made following the standard protocol . In step 5, we did not incubate them for 4 hours, but only until the density was optimal (around 30-45 min).

We will use pPB.001 obtained today.
We will follow this Heat Shock protocol .

Tip (From Matt): At the last step when we recover the cells, plate most of the 200 uL and leave the rest recovering overnight. Then plate them the next day.
We will plate them in LBA+Cm. We will add 250 uL of Cm for 250 mL of LBA.


Results:

No colonies were seen 12h after. We will incubate more time. So we will (August 13th):
- We will repeat the heat shock transformation with the ligation product that was left at 4ºC
- We will run a gel with the ligation product

August 15th and 16th

Because we cannot see any colonies on August 14th, we will:
- We will repeat the heat shock transformation with the ligation product that was left at 4ºC
- We will run a gel with the ligation product

If it does not work, we should try electroporation.

Goal:Check E coli transformation with pPB.001

Procedure:

MiniPrep
We will extract pPB.001 by making a MiniPrep following the standard protocol.

In the nanodrop, we saw that the yield was10 ug/mL.

Digest
Using the MiniPrep we got on August 13th, we will do a digestion analysis: (Jake's recipe)
- 5 uL plasmid (for the Ecoli we used 10 uL and added less water)
- 2 uL Fast Digest Green (has LD in it)
- 1 uL NotI or EcoRI+PstI. We used EcoRI+PstI as it was impossible to find NotI.
- 13uL of H2O

(Final volume of 20 uL)

We will incubate for 15-30 min at 37ºC. Then we will run 10 uL (our Fast Digest Green buffer already has Loadyng Dye in it, so no need to add more) in an agarose 1% gel.

Results:

We can see the pSB1C3 but not agaA. We are going to make a culture of the second plate we plated, and try again with more colonies tomorrow.


August 17th
Goal:Check E coli transformation with pPB.001

Procedure:

MiniPrep
We will extract pPB.001 by making a MiniPrep of 8 colonies of the second plate we plated (we left a part of our liagation at 4ºC overnight and then transformed E coli) following the standard protocol.


Digest
Using the MiniPrep we got on August 13th, we will do a digestion analysis: (Jake's recipe)
- 5 uL plasmid
- 2 uL Fast Digest Green (has LD in it)
- 1 uL NotI or EcoRI+PstI. We used EcoRI+PstI
- 13uL of H2O

(Final volume of 20 uL)

We will incubate for 15-30 min at 37ºC. Then we will run 10 uL (our Fast Digest Green buffer already has Loadyng Dye in it, so no need to add more) in an agarose 1% gel.

PCR
We also made a PCR to see the gBlock. We followed Jake's protocl for the Fusion Polymerase with the forward primer oPB.001 and the reverse primer oPB.005.


Results:

-We cannot see anything in the analysis by digestion.

-The gel of the PCR confirms the presence of our gBlock with agaA



- 1st raw: Gene Ruler 100 kbPlus + 1uL Loading Dye
- 2nd raw: Colonies from the second transformation (Ligation was left overnight at 4ºC). There are 7 single colonies that were miniprep. We PCR with oPB.001 and oPB.005 (for the gBlock that contains agaA). The gBlock has been amplified, we can see a band around 350bp.

The transformation has been successfull! We will make a liquid culture to make a glycerol stock tomorrow and send a sample to sequence to GATC.

September

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October

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