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From 2014.igem.org

BYU 2014 Notebook Edit May June

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1 May 2014

Aiia: Today a plasmid prep of the Aiia plasmid was performed following the Denville SpinSmart Plasmid Purification protocol.

Alpha Amylase: Today sewing PCR was performed on the alpha amylase forward primer pieces. In order to PCR with the overlap extension primers that contain our signal sequence we will need to PCR with just the forward and reverse with the signal sequence and no template so that we have a combined forward primer to use. Then we will use that combined primer as a forward primer in a normal Q5 PCR reaction with the template. The only difference is that 2 uL of each primer should be used (the forward signaling sequence primer and the reverse signaling sequence primer). (JB)

2 May 2014

Today we ran our sewing PCR products on agarose gel and each got a product around 150 base pairs as it should have if the reaction worked properly. We then set up the next reaction with the newly sewn forward primers with the signaling sequence and the reverse primers for each gene as well as the template. We have a 5 uL control for each and then a reaction for each of the parts (including the two Amylase parts we are testing). The tube labeled Amy1 is pIG 92 and the tube labeled Amy2 is pIG98.

5 May 2014

Today we ran the gel of our PCR products of the enzyme plasmids with our sewn forward and regular reverse primers.

Aiia had a product that was around 2500 bp, where is should have only been around 800 so we need to figure out if it amplified the whole plasmid.

DispB showed smearing so either we need to play with the annealing temperatures because the primers are either not attaching at this temperature we used or the plasmid needs to be purified more.

Amy2 was the best band. This was from PIG98. We will need to digest this and the backbone and run it on low melt gel.

Left: Gel image of the sewing PCR reaction

Right: Gel image of finished gene+signaling sequence PCR products (Lane order: 5 kb ladder, Aiia, Amylase1/pIG92, DispersinB, Amylase2/pIG98)

6 May 2014

Alpha Amylase: Today I purified the PCR product from the Alpha Amylase pIG98 plasmid (Amylase2) since it appeared to have the more solid band of the two on the gel. I then prepped a vector and insert digest from the purified PCR product and the iGem backbone. Thursday I will run it out on a low melt gel in order to perform a ligation of the two together. (JB)

8 May 2014

Alpha Amylase: Today I ran the low melt gel of the psb1c3 backbone and AA insert. It turned out well and I was able to see that a segment corresponding to the length of the RFP gene was separated from the plasmid. I followed our standard ligation procedure and will allow it sit overnight in order to get a better ligation. Tomorrow I will transform it into E. coli. (JB)

10 May 2014

Alpha Amylase: Today the Alpha Amylase insert was ligated into the iGem plasmid vector and this was then transformed in DH5α following the standard procedures for ligation and transformation. (JB)

13 May 2014

Alpha Amylase: The E. coli that I transformed last weekend turned out really well. There were a lot of colonies covering the entire plate and only a few red colonies (where the RFP gene had not been excised meaning the insert did not properly work in these colonies). Today I picked eight colonies from the plate and mixed each colony that I picked into 50 uL of ddH2O, then wiped that pick on a new plate in its designated spot (numbered 1-8 to correspond with the tubes). I then boiled the tubes and the DNA acquired from these tubes will serve as template for colony PCR. I then prepped RedTAQ PCR and placed each template in its respective tube along with a control. I will run these on gel tomorrow to test the colonies in order to discover whether or not the insertion/transformation worked. I followed the standard RedTAQ procedure for the colony PCR and used 2 uL of boiled colonies as template. (JB)

14 May 2014

I ran the gel from the RedTAQ PCR yesterday and there were no bands from any of the boiled samples or control so I re-prepped a new batch of PCR and ran it. I will run the gel tomorrow. However, all of the swabs of the colonies on the plate produced good streaks. (JB)

15 May 2014

Alpha Amylase: Below is the image from the gel run to verify the presence of the Alpha Amylase plasmid in the colonies. Again, no bands showed up indicating Alpha Amylase. Today I retransformed the Alpha Amylase ligation into E. coli so that I can make more colonies. I will need to then repeat the steps of colony PCR. Desi suggested picking from 16 colonies this time for a better chance of getting a colony that will work. She also suggested using a positive control alongside the negative control, which would be the plasmid with alpha Amylase itself. This will help ensure that all the reagents are working. (JB)

19 May 2014

Alpha Amylase: Some good news finally - I froze down my DH5α + ligation transformation from last time so I was able to save some time and just replate some of that. Tomorrow I will pick from colonies and do a 16-colony PCR to see if the gene was inserted into the DH5α. Dr. Grose said it was likely issues with PCR that caused the lack of bands last time since many of the colonies were no longer red last time which indicates that the transformation did work. (JB)

20 May 2014

Alpha Amylase: The E. coli colonies from yesterday turned out really well. There were not as many colonies as last time but there was only one colony that I could see that was a pinkish color. I prepped colony PCR from 16 different colonies which I labelled on the plate. I then used those picks as template and streaked them in their respective quadrants. I will run the 16 colonies and control tomorrow on gel after PCR. (JB)

21 May 2014

Alpha Amylase: The colony picks all grew up well overnight. Colony 13’s PCR tube burned out - I think the cap had been mashed up a bit when I was trying to put the lid on so it probably did not close all the way.

No bands with PCR again. Desi suggested running a positive control this next time. This will consist of the Alpha Amylase plasmid with the Amylase reverse and Amylase forward signaling sequence if it has Alpha Amylase in it. If not I will need to grab another forward from the registry. (JB)

22 May 2014

Alpha Amylase: I will be using BI259 as an Alpha Amylase forward for a positive control.

Today I repeated the setup for colony PCR. As template I just reused colonies 1-8 that I had picked and streaked the other day. I made sure everything was thoroughly mixed together this time and that the polymerase was added only shortly before the PCR cycles were begun. I also created a positive control using the PIG98 plasmid and the BI259 forward primer. This primer was used in all the mixes for this round in order to determine if the Alpha Amylase was successfully transformed into the DH5α. (JB)

26 May 2014

Alpha Amylase: I ran the PCR from last week on gel. Same thing happened as before where there were no bands on the template runs. There was faint banding on the positive control so we know the reaction is working at least in a weak manner. There also appears to be multiple bands in the positive control. I will need to discuss this all with Desi tomorrow during class in order to determine what is going on. (JB)

27 May 2014

Alpha Amylase: Since the RedTAQ did not work again so we ran Taq and RedTaq PCR side by side from templates 9-16 from my colony plate in order to see if the RedTAQ polymerase is faulty. And it worked with regular TAQ polymerase! Now I will start overnights from two of the colony streaks, do a plasmid prep tomorrow, sequence it, and then I can start mutagenesis! I started overnights from colonies 13 and 15 (gel positions 5 and 7 respectively on the lower well row). (JB)

28 May 2014

Alpha Amylase: Today I worked on the plasmid prep from my transformed Alpha Amylase gene with signaling sequence. I also prepped for sequencing tomorrow. Below are what each PCR tube contains:

1. Colony 13 Plasmid + AA w/ SS F

2. Colony 13 Plasmid + AA R

3. Colony 13 Plasmid + psB1C3 F (307)

4. Colony 13 Plasmid + psB1C3 R (308)

5. Colony 15 Plasmid + AA w/ SS F

6. Colony 15 Plasmid + AA R

7. Colony 15 Plasmid + psB1C3 F (307)

8. Colony 15 Plasmid + psB1C3 R (308)

For sequencing prep, add 2 uL plasmid and 1 uL either forward or reverse primer to PCR tube and enter it on the sequencing spreadsheet downstairs in Dr. Grose's main lab, then put the tubes in the sequencing tube holder in the order you entered them in in the spreadsheet. (JB)

29 May 2014

Today a majority of the time was spent going over the grant proposal for SYNENERGENE.

3 June 2014

Alpha Amylase: It appears the cloning sites hybridized together and there is no amylase found in the plasmid. We talked to Skip about what to do and he suggested re-digesting the pSB1C3 vector and adding phosphatase to the digest in order to prevent the Xba and Spe sites from hybridizing again.

Procedure:

Prep vector digest as normal, allow to incubate for 1 hr at 37 deg.

Add 1 uL phosphatase (CIP) and allow to incubate for 30 mins at 37 deg

Run on low melt gel and purify

Also, a possible issue that may have occurred is the primers in the colony PCR were binding to the amylase that is naturally occurring in E. coli and that may be why we saw bands in there. In order to try and solve this we are going to redo colony PCR using the plasmid specific primers instead. This way, if our modified plasmid was successfully transformed into the E. coli we will be able to determine this. (JB)

4 June 2014

Alpha Amylase: Ran the gel from yesterdays PCR of the transformed E. coli colonies with the Amylase plasmid using the plasmid primers. All of the colonies were showing 400 bp fragments which means the primers were just cutting out the plasmid in that region and there was no amylase there. This means that most likely last time the PCR results were in fact showing amylase but that which naturally is produced by E. coli and not from the transformation. Today I did a plasmid prep from the E. coli DH5α with pSB1C3 transformed into it. 100 uL were eluted and we performed a nano-drop to determine the concentration of the elution. The concentration was 154.4 ug/uL which is average. I then performed a restriction digest of the vector and changed the recipe to use 30 uL of vector and 12 uL of ddH2O since the concentration of the vector was just average. At 1 hr into the digest, CIP will be added, then after 90 minutes of digest the vector solution will be run on low melt gel and isolated. Then all of this will be ligated and we will be able to transform this into DH5α tomorrow. (JB)

5 June 2014

Alpha Amylase: Today I transformed the ligation into DH5α. I found out that I mis-prepared my ligation mix yesterday though so I re-prepped a new ligation mix, let it sit for about an hour, and then transformed this into DH5α as well. Both are labeled and we will see which turns out. (JB)

9 June 2014

Alpha Amylase: Plates from over the weekend of the transformed DH5α turned out okay. The 1st ligation (not 100% according to recipe) showed a good amount of colonies and there were several pink colonies. The 2nd, correct ligation only had 5-10 colonies but none of them were pink. I ran PCR on a selection of colonies from both ligation transformations and here are the gel results:

Gel well order: 5 kb ladder, negative control, positive control, colonies 1-4 from first ligation, colonies 5-8 from second ligation.

Expected band would be around 2000 bps (1500 bps Alpha Amylase + 100 bps signaling sequence + 200 bps + 200 bps from plasmid primers) and colonies 6 and 8 appear to be the correct length and very strong. I will send these two colonies for sequencing. (JB)

10 June 2014

Alpha Amylase: Labeling of PCR tubes for sequencing:

AA6a: Colony 6 Plasmid + Alpha Amylase with forward signaling sequence primer

AA6b: Colony 6 Plasmid + Alpha Amylase reverse primer

AA6c: Colony 6 Plasmid + psB1C3 forward primer (307)

AA6d: Colony 6 Plasmid + psB1C3 reverse primer (308)

AA8a: Colony 8 Plasmid + Alpha Amylase with forward signaling sequence primer

AA8b: Colony 8 Plasmid + Alpha Amylase reverse primer

AA8c: Colony 8 Plasmid + psB1C3 forward primer (307)

AA8d: Colony 8 Plasmid + psB1C3 reverse primer (308)

I added 2 uL plasmid and 1 uL either forward or reverse primer to each PCR tube.

Tubes were sent for sequencing today. (JB)

12 June 2014

Alpha Amylase: Sequencing looked fairly good. Need to be sure to pipette carefully the full 2 uL of plasmid and 1 uL of primer, make sure no drops left on side of tube or in pipette cap. We will have to see this next round of sequencing if there were in fact no unintentional mutations. (JB)

17 June 2014

Alpha Amylase: Plating of the transformation of Alpha Amylase mutant showed no colonies. Today I am going to plate the other 450 uL of the previous transformation and re-transform DH5α with 5 uL of Alpha Amylase mutant product this time and then plate all 550 uL of the transformation.

Below are pictures of my colonies and transformation plate that I used in preparation for mutagenesis. The four colonies on the bottom are the colonies that were used. (JB)

18 June 2014

Alpha Amylase: There were not any colonies on either of the transformed mutation plates. (JB)