Team:Stanford/Notebook/Lab Work/Week 5

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7/26 Monday

Alex's Notebook

Get picture from gel imager. Run the gel. Gel extract. Ligate. Transform. Plate. Both BW and DH5alpha. Order:  Heat shock cells  EcoRI-HF  T4 Ligase  MinElute tubes (?)

PCR: RBS’s  100 ng template  .5 ul primers (200 nM). Also try 2 (800 nM).

Promoters Try varying concentrations for NC and C  20 uM primer solution, 50 ul tot. vol. Want: 100, 200, 300, 400, 500 nM conc.  Use: .25, .5, .75, 1, and 1.25 uL primers and 4.5, 4, 3.5, 3, and 2.5 uL H2O.  Try 200, 400, 1000 (2.5 uL), and 2000 (5 uL) first

Try 2+3, then +1+4, one PCR purified and other not.  20 uM primer solution, 50 ul tot. vol.

 40 sm, 2+3, PCR purify, transfer. 5 uL each primer. SHOULD NOT WORK!!!  40 sm, 2+3, direct transfer.  40 sm, 1+4+2+3. 4 uL primer 1, 4 uL primer 4, and 2 of template (transfer).  40 sm, 1+4+2+3. 4 uL primer 1, 4 uL primer 4, and 2 of template (transfer).

 45 sm, 2+3, PCR purify, transfer. 2.5 uL each primer.  45 sm, 2+3, direct transfer.  45 sm, 1+4+2+3. 2 uL primer 1, 2 uL primer 4, and 1 of template (transfer).  45 sm, 1+4+2+3. 2 uL primer 1, 2 uL primer 4, and 1 of template (transfer).

 From best of these reactions, take .5 of P1 and P4 with .1 PCR purified template.  Use YA, 30 cycles.

Laura's Notebook

helped Francisco aliquot competent cells (thaw main tube- 1 mL- on ice, transfer 50 uL to each of 20 pre-chilled 0.5 mL microfuge tubes)

7/27 Tuesday

Alex's Notebook

Continue w/ PCR.  100 seems okay. Nothing from 107, since sequence is messed up. I5 and F26 look ok. I0500 (1255 bp) Good F2620 (1106 bp) Good enough.

J100 (98 vs 62 bp) Good enough. J107 (98 bp) Nothing.

AfsS C (123 bp) Good AfsS NC (104 bp) Good

 Next steps:  PCR purify (regular and MinElute). Nanodrop.  RD: E/P. Spacer should be enough.  Heat inactivate (80 C for 20 min, 75 C for 20 min for Klenow), RD cleanup. Nanodrop.  Ligate. Ratios: 20 uL total: 1 uL ligase, 2 uL buffer, 8 uL, 8 uL insert, 375 ng vector.  Heat inactivate (65 C for 20 min.) and transform.

 New scheme for AfsS assembly:  1+2, 3+4, gel electrophoresis to get rid of primers. Use -------------- for primer concentration.  Gel extract wanted product. Mix in a single reaction. Use same as above.

Check plates.  Some grew. Culture O/N and do colony PCR.  Focus on parts needed.  RD today. All parts. Get extra RD enzyme (BglI). Control: 1A2 @ EcoRI, and use blunting enzyme from Ryan.  100 uL total: 24 uL DNA, 52 uL H2O, 10 uL BSA, 10 uL NEB buffer (check which to use), 4 uL enzymes.  Gel electrophoresis and extract.  Ligate and heat inactivate (as above). Transform.  Use brown stripe or use new ligase buffer. NEED MORE LIGASE!!!  1.5 uL DNA, incubate on ice.

Prepare more electro-competent cells. Use DH5 alpha 21. Check for space in the incubator.

Laura's Notebook

redo failed ligation: vary vector/insert ratios

	prior recipe	ligation 1	ligation 2	ligation 3
water	none	11.0	7.0	none
vector	5.0	2.0	2.0	2.0
insert	12.0	4.0	8.0	15.0
10X buffer	2.0	2.0	2.0	2.0
ligase	1.0	1.0	1.0	1.0

• vector=B1006 linearized (cut with EcoRI, XbaI; inserts=GFP or RFP cut with EcoRI, SpeI (6 ligations set up)
• Francisco transformed these

7/28 Wednesday

Alex's Notebook

Cultivate cells. PCR 1,2 and 3,4. Gel, gel extract.

Laura's Lab Notebook

miniprepped (ProMega kit): GFP and B1006 terminator (RFP didn't grow) NanoDrop data:

sample	260/280	260/230	ng/uL
B1006	1.61	0.95	49.4
GFP	1.83	1.22	96.4

ran 2% diagnostic gel, 75V, 1 hour

• order: 100bp ladder, RSID1C PCR product, GFP digestion, RFP digestion, terminator digestion
• all samples: 1 uL sample + 1 uL loading dye

ran 2% gel for gel extraction, 75V, 1 hour

• order: 100bp ladder, GFP digestion, RFP digestion
• 10 uL loading dye added to 50 uL digestions, 40 uL loaded on gel

gel extraction of GFP, RFP digestion products (Qiagen kit)

	tube (g)	tube + slice (g)	gel slice (g)	uL QG
GFP	1.01	1.03	0.02	60
RFP	1.01	1.03	0.02	60

ran 2% diagnostic gel of gel purified GFP and RFP digests

• order: 100bp ladder, GFP, RFP
• 1 uL sample + 1 uL dye + 4 uL H2O

B1006 terminator NanoDrop data (diluted 50:50 with H2O)

260/280	260/230	ng/uL
1.47	1.39	10.4

• = 20.8 ng/uL in original sample

Digest concentrations still very low... set up larger overnight cultures- 9 mL cultures, 2 cultures each part:

• B1006 (terminator)
• GFP
• RFP
• pBAD (I0500)
• pLUX (F2620)

7/29 Thursday

Alex's Notebook

Transform using ccdb vector w/ new ligase and ligase buffer. Final PCR assembly 1,2+3,4. Failure.

Laura's Notebook

Miniprepped (ProMega kit): RFP, GFP, B1006 terminator, F2620 (pBAD didn't grow)

• all 18 mL (2- 9mL cultures) combined into one miniprep for each
• Francisco did nanodrop: he has concentration data

set up digestions for both types of ligations (two-part and 3a protocol)

1. RFP and GFP: cut with EcoRI, SpeI (2 digestions each)
2. B1006 terminator: cut with EcoRI 2 hours, heat kill 80oC 20 minutes, then add XbaI overnight
3. B1006: cut with XbaI and SpeI
4. 4C5 backbone: cut with EcoRI, PstI

• for two part ligations: use GFP or RFP from #1, terminator from #2 (2 ligations- one for GFP, one for RFP)
• for 3a ligation: use GFP or RFP from #1, terminator from #3, 4C5 backbone from #4 (2 ligations- one for GFP, one for RFP)

Meeting with Rayka- suggestions for Friday's (tomorrow's) meeting:

• include a brief review/overview of project for clarification
  • basic schematics of the two sides of the project
  • details of each, including the devices we plan to build
  • ligation schemes in visuals
  • for digital, analog: 1. overall plan 2. ligation scheme (home slide) 3. troubleshooting/challenges (including potential solutions)

suggestion for ligations: add ATP (is most likely to go bad in buffer) include plans for next week: minimum and ideal agenda again after lab stuff Twitter slide: change title to Gold Medal Requirements (add Facebook?) Lab Logistics: suggestions to collaborate in lab more efficiently

7/30 Friday

Laura's Notebook

9am iGEM meeting

in attendance: team (Chris, Karina, Alex, Francisco, Laura), Christina, Ryan, Rayka, Anusuya, Graham

Things to accomplish/address by next week:

• potential names of circuits (Laura, Rayka)
• flow cytometry: Does Scanford work for E. Coli? (Chris, Graham)
• get ligations to work! (everyone)
  • make sure DNA concentration is high enough
  • when looking at gel to estimate concentration, look directly at gel (not at image on computer screen)
  • use fresh ligase buffer (or add ATP)
  • get successful ligation to use as positive control (from Ryan?)
• get RSID1C PCR working
  • check concentration of primers: mix well, make new working stock
  • double check annealing temperatures, correct sequences
• 4 piece PCR (Alex)- order as 2 pieces?
• circuit diagrams, including levels of abstraction, consistent formats
• Twitter:
  • list/group
  • record audio (in as many languages as possible)