Team:Illinois/Antibody Receptor Tyrosine Kinase Fusion Notebook

From 2008.igem.org

(Difference between revisions)
(→September 27, 2008)
Line 473: Line 473:
[[Image:9_27_08.jpg|none]]
[[Image:9_27_08.jpg|none]]
-
* The first 8 reactions may have worked.  The band around 4500bp is the proper length for the full length flk-1 gene, but again it is not very bright.
+
* The first 8 reactions may have worked.  The band around 4500bp is the proper length for the full length flk-1 gene, but again it is not very bright.  Also, the different length flk-1 fragmetns all seem to be running at approximately the same size on the gel.
== September 28, 2008 ==
== September 28, 2008 ==

Revision as of 03:56, 28 October 2008

RTKnotebookpic.png

Home Team Project Notebook Research Articles Parts Protocols Pictures

Contents

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)
  • Procedure:
  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
  8. 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.
tube 1 2 3 4 5 6 7 8
Antibody chain H H L L H H L L
DNA source mini-prep synthesized IDT genes
template 0.5ul
primers 1ul of appropriate forward and reverse primer
MgCl2 3ul 5ul 3ul 5ul 3ul 5ul 3ul 5ul
master mix 20ul
H20 to 50ul total volume
  • 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.
07-30-08 AbFrag Gel1.jpg


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.
tube 1 2 3 4
template from 7-30 PCR 2+3 2+7 6+7 1+8
template 0.5ul of both heavy and light chains
primers 1ul of appropriate forward and reverse primer
MgCl2 0ul 0ul 3ul 3ul
master mix 20ul
H20 to 50ul total volume
  • 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.
7 31 08 assembly.jpg


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.
reaction series A B C D E
template (5+7) from 7-30 PCR 0.5ul 1ul 1.5ul 2ul 1ul
primers 1ul of forward and reverse primers (omitted in E series)
master mix 20ul
H20 to 50ul total volume
  • 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.
8 1 08 assembly gradient.jpg


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 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 ATCC resuspended in 5ml LB, grown at 37 degrees.
  • YCp50-poly is the yeast/E. coli shuttle vector we chose to place our receptor gene on. It allows for selection using ampicilin in E. coli and media lacking uracil in yeast.


September 7, 2008

  • Mini spin prep of flk-1 and YCp50-poly cells, plasmids stored in 50ul H2O.
  • We now have purified supplies of the plasmid carrying the flk-1 gene and our shuttle vector.


September 25, 2008

  • Making biobricks
  • Here we ran PCRs to include the biobrick prefix and suffix sequences into the genes for the TE33 heavy and light chains, the single-chain antibody, and flk-1. PCRs were also run to amplify various lengths of the flk-1 gene. We want to investigate whether certain sections of the extracellular domain of flk-1 contribute to dimerization activity, or if much of the extracellular domain can be replaced by the single-chain antibody. Flk-1 links 1, 2, and 3 delete 222, 420, and 660 amino acids from the N terminus of flk-1 respectively. These deletions were chosen to conserve varying numbers of immunoglobulin domains found in the extracellular portion of flk-1. Structural information can be found here.


tube 1 2 3 4 5 6 7 8
0.5uL template H chain L chain SCA SCA SCA SCA flk-1 flk-1
IDT IDT A B C E A B
primers 1uL forward & reverse for all
mastermix 8.25uL for all
H2O 39.25uL for all
tube 9 10 11 12 13 14
0.5uL template SCA w/ link SCA w/ link SCA w/ link SCA w/ link flk link 1 flk link 1
A B C E A B
primers 1uL forward & reverse for all
mastermix 8.25uL for all
H2O 39.25uL for all
tube 15 16 17 18
0.5uL template flk link 2 flk link 2 flk link 3 flk link 3
A B A B
primers 1uL forward & reverse for all
mastermix 8.25uL for all
H2O 39.25uL for all
  • 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
  • The results were mostly as expected. The biobricks for the light and heavy antibody chains, and the single chain antibody were of the expected lengths. The amount of DNA for flk-1 based of products seems to be low, and it is hard to tell if the bands are of the proper size because they are larger than the lader that was used.
  • Lanes 1,2,6,8,12,14,16,18 were cut out and purified with invitrogen gel extraction kit, eluted in 50ul H2O.


9 26 08 biobricks.jpg


9 26 08 biobricks (2).jpg
  • Although it is unclear whether the flk-1 PCRs worked, we will continue on and run a PCR to assemble the the single-chain antibody with the flk-1 fragments. We will be using a similar strategy as we used to assemble the single-chain antibody: the ends of each fragment will have complementary sequences which will anneal and amplify in the PCR reaction to yield a full length product. The linker region will again code for a flexible glycine-serine linker, but the sequence was rearranged to avoid any incorrect annealing with the linker region already present in the single-chain antibody.
tube 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
template 0.5ul flk-1 A 0.5ul flk-1 B 0.5ul flk link 1 A 0.5ul flk link 1 B 0.5ul flk link 2 A 0.5ul flk link 2 B 0.5ul flk link 3 A 0.5ul flk link 3 B 0.5ul SCA link + 0.5ul flk link 1 0.5ul SCA link + 0.5ul flk link 1 (crude) 0.5ul SCA link + 2ul flk link 1 0.5ul SCA link + 2ul flk link 1 (crude) 0.5ul SCA link + 0.5ul flk link 2 0.5ul SCA link + 0.5ul flk link 2 (crude) 0.5ul SCA link + 2ul flk link 2 0.5ul SCA link + 2ul flk link 2 (crude 0.5ul SCA link + 0.5ul flk link 3 0.5ul SCA link + 0.5ul flk link 3 (crude) 0.5ul SCA link + 2ul flk link 3 0.5ul SCA link + 2ul flk link 3 (crude)
primers 1uL forward & reverse for all
mastermix 8.25uL for all
H2O to 50ul total volume
  • 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


9 27 08.jpg
  • The first 8 reactions may have worked. The band around 4500bp is the proper length for the full length flk-1 gene, but again it is not very bright. Also, the different length flk-1 fragmetns all seem to be running at approximately the same size on the gel.

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
tube 1 2 3 4 5 6
template A=0.5uL B=1.0uL C=1.5uL (all flk-1 B)
primers 1uL forward & reverse for all
mastermix 8.25uL for all
H2O 39.25uL for A 38.75uL for B 38.25uL for C
tube 1 2 3 4 5 6
gradient 55.0 57.8 59.3 61.0 63.5 65.0
temps (1) (5) (6) (7) (9) (12)
  • 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
tube 1 2 3 4 5
template 0.5uL SCA + 0.5uL flk-link3(8) 0.5uL SCA + 1.0uL flk-link3(8) 0.5uL SCA + 1.5uL flk-link3(8) 0.5uL SCA + 2.0uL flk-link3(8) 0.5uL SCA + 1.5uL flk-link3(8)
primers 1.0uL forward & reverse none
mastermix 20.0uL for all
H2O 27.0uL 26.5uL 26.0uL 25.5uL 28.0uL


October 17, 2008

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


October 18, 2008

  • Using phusion to get ARTK
tube 1 2 3 4 5
template 0.5uL SCA + 0.5uL flk-link3(8) 0.5uL SCA + 1.0uL flk-link3(8) 0.5uL SCA + 1.5uL flk-link3(8) 0.5uL SCA + 2.0uL flk-link3(8) 0.5uL SCA + 1.5uL flk-link3(8)
primers 1.0uL forward & reverse no primers
buffer 10.0uL for all
phu 0.5uL for all
H2O 36.5uL 36.0uL 35.5uL 35.0uL 37.5uL


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
tube 1 2 3 4 5 6 7
5uL DNA pSB1A7 pSB1A3 H brick L brick SCA brick flk-1 brick flk-1 plasmid
5uL buffer2
0.5uL BSA
1uL RE 1 EcoRI
1uL RE 2 PstI HindIII
37.5uL H20 PstI HindIII
37.5uL H20


October 23, 2008

  • Transformations failed; competent cells may be bad.
  • Innoculated 5mL culture with DHS α PRO to make more competent cells tomorrow.
  • Ran 0.8% gel of restriction digests, no band in H brick lane (!) or flk-1 brick (expected), the rest as expected. * Cut out and purified bands for ligations and PCR.
  • PCR to get flk-1 fragments
  • 0.5mL purified flk-1 fragment, 1uL F & R primers, 20uL matermiz, 27.5uL H20
tube 1 2 3 4
flk-1 flk-1 link 1 flk-1 link 2 flk-1 link 3


October 24, 2008

  • Control transformation using XL1 Blue cells from mutagenesis kit worked perfectly w/ pUC18, pSB1A7, and pSB1A3.
  • Made new batch of competent cells, see 7-18-08.
  • Ligation of restriction products from yesterday:
    • 2uL reactor, 6uL insert, 0.5mL TH ligase, 1uL buffer, room temp 1 hr
  • PCR from yesterday failed.
  • DHS α PRO transformed w/ pSB1A7 + L chain, pSB1A7 + SCA, pSB1A3 + L chain, pSB1A3 + SCA


October 25, 2008

  • Transformations failed, forgot to run a control so could be because the competent cells are bad.
  • Ligation may have been unsuccessful also.
  • Transformed XL1 Blue w/ 5uL of ligation products pSB1A7 + L chain, pSB1A7 + SCA, pSB1A3 + L chain, pSB1A3 + SCA, and also 1uL pUC18.
  • Repeated ligation:
    • 3uL vector, 9uL insert, 4uL buffer, 1uL T4 ligase, 3uL H20, room temp 5 min
  • Used 1uL of new ligation to transform XL1 Blue and 2uL to transform DHS α PRO


October 26, 2008

  • Transformation failed (except controls)
  • Setting up more transformations, pSB1A7 + L, pSB1A7 + SCA, pSB1A7, pUC18 in T&p 10 and DHSα.


Home Team Project Notebook Research Articles Parts Protocols Pictures

Retrieved from "http://2008.igem.org/Team:Illinois/Antibody_Receptor_Tyrosine_Kinase_Fusion_Notebook"