Team:Illinois/Antibody Receptor Tyrosine Kinase Fusion Notebook

From 2008.igem.org

Revision as of 20:00, 25 October 2008

July 1, 2008

Made Yeast Media

YPD Medium, per liter:

10g yeast extract

20g peptone

20g dextrose

20g agar(only for plates)

1. Dextrose filter sterilized, the rest autoclaved

2. Weigh nutrients into flask double the volume you want to make, and stir to dissolve

3. Dextrose added to autoclaved media to equivalent of 20 g/L

4. Liquid media placed on bench, plate media placed in 65 degree water bath approximately 5 minutes

5. Poured into plates and allowed to solidify

July 17, 2008

E.Coli Media

LB medium, per liter

10g tryptone

5g yeast extract

5g NaCl

1 mL 1N NaOH

15g (agar for plates)

1. Antibody DNA resuspended in TE buffer, 0.1 μg/μL

2. 5mL LB inoculated with single colony DH5a pro

3. Incubated at 37 degrees overnight

July 18, 2008

We made competent cells to use for transformations.

Procedure:

1. 3mL overnight culture of DH5a pro

2. Inoculated into 35mL of LB

3. OD600 checked, want 0.2-0.3

4. Place culture on ice for 3 minutes

5. Spin at 10,000 rpm for 7 minutes, discard supernatant

6. Resuspend in 10 mL cold 30 mM CaCl2, spin as before

7. Resuspend in 3 ml cold 30 mM Cacl2, incubated on ice overnight

7. Glycerol added to 10%, cells in freezer

July 19, 2008

Transformation: We received the synthesized TE33 antibody genes from IDT on plasmids. We transformed these plasmids into DH5a cells and plated on LB+amp to screen for transformants.

1. Cells put on ice 30 min with 1μL plasmid(100ng)

2. Heat Shock for 2 minutes at 42 degrees

3. Ice for 8 minutes

4. Add cells to 1ml LB

5. Grow for 1 hour

6. Plate 100 to 200 μL on LB amp, grow overnight

July 21, 2008

Observations:

There were plenty of transformants on the plates. 5ml of LB+amp was inoculated for plasmid extraction the next day.

July 22, 2008

Mini spin prep kit was used to extract the plasmids carrying the TE33 light and heavy chains. From these plasmids we can run PCRs to amplify the regions of the antibody chains.

DNA eluted in 100μL H2O and frozen.

July 29, 2008

All primers brought to standard concentration, 30mM

33.3μL H2O added per mole of primer

July 30, 2008

Assembly PCR: The antibody genes synthesized by IDT contained the entire antigen binding fragments of the light and heavy chain, but to construct a single chain antibody we only need the variable regions of these genes. This PCR will amplify just those sections of the gene and will leave both the light and heavy chain fragments with complementary ends that can be assembled in a following PCR.

Master mix already contains MgCl2; should have added extra to some tubes.

PCR program

1. 94 degrees 5 min
2. 94 degrees 1 min
3. 50 degrees 1 min
4. 72 degrees 1 min
5. GOTO 2. 29 cycles
6. HOLD at 4 degrees

1.5% agarose gel made, 0.75g agarose in 50ml 0.5X TBE w/10ul EtBr.

20ul of PCR produts loaded on gel w/4ul 6X loading buffer, run at 200V for about half an hour.

All lanes had lots of DNA at ~375bp which is the expected length, PCR worked.

July 31, 2008

Another PCR to asemble the TE33 heavy and light chain fragments from yesterday. The complementary region codes for a flexible glycine-serine linker that will join the two halves of the single chain antibody.

PCR program

1. 94 degrees 5 min
2. 94 degrees 1 min
3. 50 degrees 1 min
4. 72 degrees 1 min
5. GOTO 2. 29 cycles
6. 72 degrees 5 min
7. HOLD at 4 degrees

Products run on a 1.5% agarose gel, no products in the expected 700-800bp range.

August 1, 2008

PCR troubleshooting of yesterday's reaction: use gradient for annealing temp (40-65 degrees), use more template, leave out end primers

Four series of reactions using a gradient annealing temp were run in addition to a fifth series omitting the end primers.

Annealing temps: 40, 43.8, 50, 54, 60, and 64 degrees

PCR program

1. 94 degrees 5 min
2. 94 degrees 1 min
3. annealing step 1 min
4. 72 degrees 1 min
5. GOTO 2. 29 cycles
6. HOLD at 4 degrees

PCR products run on 1.5% agarose gel at 200V for ~20 minutes, then 240V for ~20 minutes.

Products in the 700-800bp range in all lanes. Perhaps it worked because of using a differnt product from the 7-30 PCR. We now have the DNA for our single chain antibody.

August 6, 2008

1.5% agarose gel of 8-1 PCR products run to cut out bands. Products A1, B1, C1, and E1 used. We will use this purified DNA for making biobricks and future PCRs to assemble our antibody-receptor fusion.

Bands around 800bp cut out for all lanes and invitrogen gel extraction kit used to collect DNA in 50ul H2O.

September 5, 2008

Flk-1 clones from [http://www.atcc.org/ATCCAdvancedCatalogSearch/ProductDetails/tabid/452/Default.aspx?ATCCNum=MGC-18600&Template=mgcMouseClones ATCC] streaked onto LB+amp and incubated at 37 degrees.

Flk-1 is a mouse gene coding for a vascular endothelial growth factor receptor, a tyrosine kinase receptor. We chose this particular receptor because it is well characterized and because it appears to activate simply through dimerization. This is important because if ligand binding caused a conformational change that helped to activate the receptor it is unlikely that dimerization caused by the single-chain antibody binding cholera toxin would create a similar conformational change.

September 6, 2008

Colonies picked from flk-1 plate and inoculated into 5ml LB+amp, grown at 37 degrees.

Freeze-dried e. coli with YCp50-poly from [http://www.atcc.org/ATCCAdvancedCatalogSearch/ProductDetails/tabid/452/Default.aspx?ATCCNum=87555&Template=vectors ATCC] resuspended in 5ml LB, grown at 37 degrees.

September 7, 2008

Mini spin prep of flk-1 and YCp50-poly cells, plasmids stored in 50ul H2O.

September 25, 2008

Biobricks

Bricks to be made: H chain, L chain, SCA, flk-1

PCR program

1. 94 degrees 4 min
2. 94 degrees 1 min
3. 50 degrees 1 min
4. 72 degrees 3 min
5. GOTO 2. 29 cycles
6. HOLD at 4 degrees

September 26, 2008

• product from yesterday run on 1% gel, 200V for ~30 minutes
• mostly good results, small amound of DNA for flk-1
• lanes 1,2,6,8,12,14,16,18 cut out and purified with invitrogen gel extraction kit, eluted in 50ul H2O

PCR to assemble SCA-flk-1 fusion and increase flk-1 yield

PCR program

1. 94 degrees 4 min
2. 94 degrees 1 min
3. 50 degrees 1 min
4. 72 degrees 3 min
5. GOTO 2. 29 cycles
6. HOLD at 4 degrees

September 27, 2008

• 0.8% agarose gel run of products from yesterday, 200V for ~45 minutes

• first 8 reactions may have worked but bands not great, assembly reactions did not work

September 28, 2008

0.8% gel run of yesterday's products, 150 V, 38 min, 200 V, 10 min

September 30, 2008

p1010 plasmid for biobicks cut out of plate 1003, well 4A; soacked in 5uL warm TE (50°C) for ~20 min, heat shocked at 50°C for 60s, placed on ice 2 min, 200uL LB added, incubated at 37°C, 1 hour, plated on LB + Amp and incubated overnight.

Restriction digest of our biobricks 18uL H2O 2uL 10x buffer Z 1uL EcoRI and PstI 1,2,4 uL DNA (H chain, L chain, SCA, flk)

p1010 transformatoin was stupid, transformed another plasmid instead, 1008, 1C

Run for 39 cycles

October 2, 2008

PCR products run on 0.8% gel, 200V, ~40min Same results as always

pSB1A3 & pSB1A7 cut out of registry and transformed Plated on LB+Amp

October 3, 2008

PCR from yesterday may have kind of worked, just not a lot of product, running another gel to find out

Transformation failed, transforming w/ RDR plasmid to test transformation protocol

Hard to tell if PCR products are correct length, so-so bands

October 8, 2008

Transformations to get plasmids 1003:2F, 1008:10D, 1008:1C, 1008:6G

October 10, 2008

DNA purification using S prime PerfectPrep(TM) Spin Mini kit on transformed bacteria from 10/8/2008

October 14, 2008

Transformation using plasmid from 10/10/2008

October 16, 2008

Transformation failed, duh top 10 50uL cells transformed with 1003:10D, 1003:2F, plasmid from 10/10/2008, and pUC19 control

PCR to make ARTK fusion

October 17, 2008

Transformation failed. 1% gel of yesterday's PCR run, 200V, ~40min, no bands

October 18, 2008

Using phusion to get ARTK

October 21, 2008

Made 500ml LB media 500mL DI water 5g Tryptone 2.5g Yeast Extract 2.5g NaCl Autoclaved on liquid setting, 15 min.

Frozen stocks of pSB1A7 and pSB1A3 from iGEM used to innoculate LB+Amp cultures for plasmid prep.

October 22, 2008

Cultures from yesterday used for plasmid prep (minispin kit)

restriction digests

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