Week from August 3rd, to August 9th, 2009

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August, 3rd

• This week we planned to continue the assembly of the synthetic ethanologenic operon.

• We received DH5alpha, XL1-Blue and DB3.1 competent cells from Bologna iGEM Team. Thank you!!

• We performed 2 screenings for the 7 samples of B3 and for the 7 samples of B4:

• SCREENING 1 - Ojective: check the presence of non-ligated plasmids. We planned not to digest with standard enzymes because the resulting fragments would result either too small or too big. Insert excision would generate a possible 129pb fragment, while vector linearization would generate possible 3Kb or 5Kb fragments. We used ApE to decide the best enzymes to cut. Digestion with XhoI-PstI (6 ul of DNA, final volume 20ul).

• Gel results:
  • Only B3-1 and B3-5 showed the bands with expected length for the correct plasmid.
  • All B4 samples showed the bands with expected lengths!

• SCREENING 2 - Ojective: check the presence of the right insert length for B3 samples, because there was the possibility that B1 vector (pSB1A2) ligated in B0015 vector (pSB1AK3) as an insert. If so, no XbaI site is present in the final plasmid, while correct ligations should show a ~1900bp fragment as an insert. Digestion with XbaI-PstI (2 ul of DNA, final volume 20ul). We decided to perform the reaction for all B3 samples, even if only two were good.

• Gel results: B3-1 and B3-5 showed the expected bands for pSB1AK3 (~3200 bp) and B1-B0015 ligated insert (~1900bp).

• We sent the following purified DNA samples to BMR Genomics for sequencing:
  • B3-1
  • B3-5
  • B4-2
  • B4-4

• LB agar plates + Kan preparation.

August, 4th

August, 5th

August, 6th

• We received Ethanol Assay Kit and Lactose Assay Kit from BioVision.

August, 7th

• Miniprep for:

• We stored purified DNA at -20°C and next week we will perform digestion for these 12 samples, in order to: i) finish the assembly of the ethanologenic operon, ii) re-assemble A11, which sequence analysis showed a deletion and iii) build up an inducible lysis device.

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