Team:Paris Bettencourt/Notebook/Foot Odor

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Notebook

June

23-06-2014
Goal: To obtain single colonies of both Wt and mutant B.Subtilis

We received the wt (1A1) and mutant BKE24040 (isovalerate dehydrogenase beta KO), BKE24050 (isovalerate dehydrogenase alpha KO), BKE24080 (Leucine dehydrogenase KO) from BGSC on 23-06-2014. The wt strain (1A1) was on a paper strip. We received 3 strips from BGSC (Bacillus genetic stock centre). Where as the mutant strains arrived on perti-plates.

Procedure

We plated two strips in two different LBA plates. The plates were free from antibiotics. We placed the strips gently on the LBA and added 1 drop of sterile H2O. After few seconds we streaked the paper strip on the LBA and discarded the strip. The LBA plates were incubated at 37° C. We took single colony from the mutant B.subtilis petri-plates and streaked them on LBA+EM petri plates.

Results

Good growth of both the wt and mutant B.subtilis were observed followed by the overnight incubation

24-06-2014
To obtain single colonies of Wt b.Subtilis from 23-06-14 plate
Procedure

we took a single colony and streaked it on a new LBA with and w/o Erythromycin.

Results

No colonies in LBA + EM. Colonies observed in LBA w/o EM

27-06-2014
To prepare LBA and LB broth for B.Subtilis mutants
Procedure

We added 2.5 ul of the EM (20mg/ml) to 50ml of LB broth. We added 25 ul of EM to 250 ml of LBA and prepared the plates & stored them at 4° C.

30-06-2014
Goal: To prepare 10% glycerol stock of wt and mutant (BKE24040, BKE24050, BKE24080) B.Subtilis
Procedure

We inoculated Single colony of both wt (1A1) and mutant (BKE24040, BKE24050, BKE24080) in 5ml of LB broth supplemented w/o EM for wt and with EM for mutants. Incubated the colonies @ 37°C overnight. After the overnight incubation the tubes were stirred well. 750 ul of the culture is transferred to cryogenic tube and 750 ul of 60% glycerol is added to the culture to obtain 10% glycerol stock.

EntryStrainResistanceSourceStrainGlycerol Stock Label
sPB.011BKE24040EMBGSCB.subtilis with 2-oxoisovalerate dehydrogenase beta subunit knockoutG.11
sPB.012BKE24050EMBGSCB.subtilis with 2-oxoisovalerate dehydrogenase alpha subunit knockoutG.12
sPB.013BKE24080EMBGSCB.subtilis with leucine dehydrogenase knockoutG.13
sPB.0141A1-BGSCB.subtilis wt strainG.14

The cryo tubes were stored at -20°C.


July

15-07-14
To perform colony PCR on mutant & wt B.subtilis to confirm the knock out of gene of our interest and also to confirm the presence of ERM cassette in the loci of the knocked out genes

Work plan:

BKDA alpha

Primer category

F

R

Deletion Strain

WT

Control primer

oPB.023

oPB.025

2944 bp (A)

2920 bp (B)

Deletion primer

oPB.023

oPB.029

2230 bp (1)

No Band (2)

Deletion primer (cassette reversed)

oPB.029

oPB.025

1653 bp (DP1)

No Band (DP2)

BKDA beta

Primer category

F

R

Deletion Strain

WT

Control primer

oPB.026

oPB.028

2869 bp (C)

2836 bp (D)

Deletion primer

oPB.026

oPB.029

1629 bp (3)

No Band (4)

Deletion primer (cassette reversed)

oPB.029

oPB.028

2179 bp (DP3)

No Band (DP4)

BCD

Primer category

F

R

Deletion Strain

WT

Control primer

oPB.020

oPB.022

2636 bp (E)

2714 bp (F)

Deletion primer

oPB.020

oPB.029

1529 bp (5)

No Band (6)

Deletion primer (cassette reversed)

oPB.029

oPB.022

2046 bp (DP5)

No Band (DP6)

Reaction mix:

Reagent

Volume (uL)

20X

NF         ddH2O

236

5x Phusion HF Buffer

80

10 mM dNTPs

8

DMSO

12

DNA Template

1

Phusion Polymerase

4

PCR NEB Phusion DNA polymerase (thermocycler parameters)

Status

Temperature (°C)

Time (sec)

Process

Start

98

30

Melt

Melt

98

10

x35 Cycles

Anneal

52

30

x35 Cycles

Extend

72

90

x35 Cycles

Finish

72

300

Extend

Store

10

Store

Procedure

After the PCR the reaction mix in the tubes were loaded on individual well. The 1X agarose gel was used for the electrophoresis. The 1kb plus ladder (thermo fisher inc.) was used for comparing the bands.

Results



30-07-14
To prepare a 100X synthetic sweat master mix
Procedure

Mix the chemicals mentioned in the table below and mix them properly to have a homogeneous mixture

Quantity

unit

Chemical

2.6

g/L

L-Leucine

0.3

g/L

L-Cysteine

30.3

g/L

L-Serine

8.1

g/L

L-Alanine

0.1

g/L

L-Arginine

4.3

g/L

L-Histidine

6.6

g/L

L-Threonine

3.2

g/L

L-Valine

2

g/L

L-Isoleucine

1.19

g/L

L-Lysine

2.1

g/L

L-Phenylalanine

3.4

g/L

L-Tyrosine

2.2

g/L

L-Asparagine

2.3

g/L

L-Glutamic acid

0.7

g/L

L-Methionine

0.3

g/L

L-Glutamine

5.5

g/L

L-Aspartic acid

8.6

g/L

L-Ornithine

7.3

g/L

L-Citrulline

0.1

g/L

L-Ascorbic acid

18

g/L

D-Glucose

0.4

g/L

Creatinine

5.5

g/L

Sodium pyruvate

12

g/L

Potassium hydrogen carbonate

0.2

g/L

NaH2PO4

5.7

g/L

Calcium sulfate

SHAKE THE VESSEL WELL BEFORE USE

Take 1.39 g/l of the above master mix and dissolve it in double distilled water. Add the fatty acids as per the requirement of your experiment. The pH of the synthetic sweat could be adjusted with the aid of NaoH (use the pH meter).

Note: Autoclave the glass vessel with 15g/L of agar to prepare the LBA+ synthetic sweat plates. If not autoclave the vessel without the agar for preparing the broth.

August

11-08-2014
To produce synthetic sweat without Fatty acids
Procedure

we are going to take 0.051 g (since the master mix was 100X) of the synthetic sweat master mix and dissolve it in one liter of distilled water. The PH of the synthetic sweat was adjusted to 6.5 with aid of Hcl and NaoH. The vessel was autoclaved and stored at 4° C for future use.

25-08-14
Smell test of WT and Mutant
Goal: Measure the smell intensity of WT versus mutant
Protocole: from LB Plate of 1A1, BCD, BKDAa, BKDAb: start 5ml liquid culture (times two).
(Media preparation: M9 minimal media, with glucose as carbon source. Add tryptophan to each of the culture.)
Put one colony with a loop in each tube, culture the tubes overnight at 37°c (150 rpm).
Then we do the same, expect that we add leucine to the mdeia (500µl of 1% Leucine into 4500µl of M9) We repeat the experience twice.


Next day, after 20 hours of culture, we take the OD: Exp01
1A1= 0.180
1A1+Leu= 0.264
BCD= 0.047
BCD+Leu = 0.472
BKDAa= 0.084
BKDAa+Leu= 0.128
BKDAb= 0.088
BKDAb+Leu= 0.114

Exp02
1A1= 0.422
1A1+Leu= 0.505
BCD=0.305
BCD+Leu =0.304
BKDAa=0.322
BKDAa+Leu=0.707
BKDAb=0.179
BKDAb+Leu=0.160

We use the tubes from the exp02 and start with three members of the team. We ask the volunteer to smell the samples (choosen randomly) and to rate the intensity between 0 and 5.

Results:
1A1= 4/3/2
1A1+Leu= 1/3/4
BCD=1/3/1
BCD+Leu =2/2/0.5
BKDAa=1/3/1
BKDAa+Leu=1/2/3
BKDAb=Not grown enough
BKDAb+Leu=Not grown enough
At 22 hours of growth, we take again the OD Exp01
1A1= 0.266
1A1+Leu= 0.414
BCD= 0.195
BCD+Leu = 0.129
BKDAa= 0.059
BKDAa+Leu= 0.109
BKDAb= 0.122
BKDAb+Leu= 0.124

Exp02
1A1= 0.464
1A1+Leu= 0.508
BCD=0.388
BCD+Leu =0.332
BKDAa=0.328
BKDAa+Leu=0.711
We do then the smell test again (on exp02 tubes expect BKDAB from exp01 on 5 volunteers. We ask the participants to grade the intensity from 0 to 10.) 1A1= 5/7/2/4/2
1A1+Leu= 5/4/2/7/4
BCD=2/3/4/2/3.5
BCD+Leu =2/3/4/1/6
BKDAa=3/6/2/2/3
BKDAa+Leu=2/4/3/1/0
BKDAb=2/5/2/5/3
BKDAb+Leu=3/4/5/7/1.5

19-08-14
To access the capability of the wt and mutant (BKE24040, BKE24050, BKE24080) B.Subtilis to grow in synthetic sweat
Procedure

We inoculated Single colony of both wt (1A1) and mutant (BKE24040, BKE24050, BKE24080) in 5ml of synthetic sweat supplemented w/o EM for wt and with EM for mutants. Incubated the colonies @ 37°C overnight.

Results

No growth observed for both wt and mutant B.subtilis

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Centre for Research and Interdisciplinarity (CRI)
Faculty of Medicine Cochin Port-Royal, South wing, 2nd floor
Paris Descartes University
24, rue du Faubourg Saint Jacques
75014 Paris, France
+33 1 44 41 25 22/25
paris-bettencourt-igem@googlegroups.com
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