Inoculation of strains obtained from Dr. Christopher Hayes

Inoculated overnight cultures of:

• EPI100 w/ EC93 cosmid
• X90 w/ EC869 cosmid
• ATCC 13048

Conditions:

• 10mL LB
• 10uL ampicillin
• 37 C for 16h shaking

Isolation of template DNA

Miniprep of EC93 and EC869

• EC93 #1: 145.42 ng/μL
• EC93 #2: 198.85 ng/μL
• EC869 #1: 90.81 ng/μL
• EC869 #2: 45.95 ng/μL

gDNA isolation of ATCC 13048

• 34.87 ng/μL

Gibson primers designed for EBL1 and EBL2 toxin switched constructs in pSB1C3 and pSC101

PCR of Gibson fragments for EBL1 and EBL2 in pSB1C3

50uL rxn:

• 2.5 uL F primer
• 2.5 uL R primer
• 25 uL Q5 2X MM
• 19 uL dH2O

Fragments:

• EBL1 in pSB1C3 frag 2
• EBL2 in pSB1C3 frag 2
• EBL2 in pSB1C3 frag 3

Cycling conditions:

• 98C -- 30s

• 98C -- 10s
• TmC -- 30s
• 72C -- ext time

• 72C -- 2min

28 cycles

Troubleshooting PCR of Gibson fragments

• try using KAPA Hifi instead of Q5
• add more template gDNA (1ng, 10ng, 35ng, 70ng)

25uL rxn:

• 0.75 uL F primer
• 0.75 uL R primer
• 12.5 uL KAPA Hifi 2X MM
• dH2O up to 25 uL

Fragments:

• EBL1 in pSB1C3 frag 2 (Tm = 66C, ext time = 140s)
• EBL2 in pSB1C3 frag 2 (Tm = 65C, ext time = 88s)
• EBL2 in pSB1C3 frag 3 (Tm = 65C, ext time = 180s)

Cycling conditions:

• 98C -- 30s
• 98C -- 10s
• TmC -- 30s
• 72C -- ext time
• 72C -- 2min

28 cycles



ladder; EBL2 frag 2; EBL1 frag 2; EBL2 frag 3

Plate Making and Transformation of O3-33 WT

Goals for today: We have a vector of O333 from Neil King contained in a pET vector, the goal for today is to transform this vector, grow it tomorrow and PCR it for a large number of copies to work with and creation of a biobrick. Primers will need to be designed including the T7 promoter to terminator, with iGEM prefix and suffix.

Made plates

• 12.5g LB

• 7.5 Bacto Agar

• 500mL dH2O

• 500uL Kanomycin (50mg/mL)

• 20 minutes autoclave

• 4 hours total time to solidify

=> 32 plates total

Transformation

• 30uL iGEM electrocompetent cells

• 1uL O333 vector 1:100 dilution

• 970uL SOC save

• 45 minutes incubation @ 800rpm/37C

• 1 and 1:10 dilution plating

=> 3 transformations total

=> arc time: 5.5s, 5.6s, 5.6s

**Plates in 37C inoculation from 6:40pm

Conclusions: Transformations had a consistent arc time. Tomorrow morning plates will be checked for colonies and grown.

Transformed O3-33 WT

Recap from previous day: No colonies were shown from any of the transformations. Competent cells may have been of low quality (relatively long arc times).

Goals: Today, commercial electro-competent cells are going to be transformed, and different concentrations of DNA will be tested for transformation as well.

Transformation:

• 3x 25uL commercial electrocompetent cells

• 1uL of 1:5, 1:50, 1:100 serial dilutions of plasmid from Neil King

• 970uL SOC save

• 60 minutes save (800rpm @ 37C), then additional 50 minutes at 37C incubator (no shaking) as I was waiting for plating beads to be autoclaved and cooled

• 1 and 1:10 dilution platings

=> 1:5 DNA: 5.1s arc time

=> 1:50 DNA: 5.0s arc time

=> 1:100 DNA: 4.8s arc time

**Plates in 37C incubation from 4:10pm

Conclusions: Same as yesterday, though today arc times were slightly better. Unfortunately, my timing was off for plating because I was waiting to autoclave new beads (thanks for sharing, grad students!), so when I plated the transformants smelled pretty awful. Hopefully that doesn’t make too much of a difference.

Innoculation of transformed colonies

Recap from previous day: Colonies on all transformations were successful. Interestingly, the 1:50 dilution of DNA produced the largest number of colonies. All plates were very full, with the 1x plating dilutions being entirely unusable due to how covered they were. This may also be due to the long saving time from yesterday.

I decided to pick colonies from the 10x plating dilution of the 1:50 transformation.

Goals: The only thing I’ll really be able to do is pick colonies and grow them overnight for tomorrow.

Inoculation:

• Autoclaved culture tubes

• 2 isolated colonies picked

• 5mL LB per culture tube

**Tubes in 37C incubator from 3:30pm

Conclusions: The commercial cells were far more successful than our old cells. I used two colonies, which may not end up perfect, so I’ve stored the plate in a 4C cooler. Tomorrow, I’ll store the cells and/or miniprep and possibly make glycerol stocks of them, though I don’t have primers to sequence or PCR them beyond that.