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Team:Harvard/flavor/notebook
From 2010.igem.org
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We had previously digested the three inserts as well as the promoter with XbaI and PstI fast digest enzymes, ligated, and transformed the ligated vectors into e. coli. Unfortunately, we did not find any colonies of cells after over 14 hours of incubation. Furthermore, on Friday June 18th, after digesting all three inserts and vector and running them on a gel, we did not see any NosT + stop DNA. Therefore, on Monday June 21, we began by digesting more NosT + stop and V0120 vector with xba1 and pstI fast digestive enzymes. The gel showed DNA length to be consistent with the given parts. (See gel below) | We had previously digested the three inserts as well as the promoter with XbaI and PstI fast digest enzymes, ligated, and transformed the ligated vectors into e. coli. Unfortunately, we did not find any colonies of cells after over 14 hours of incubation. Furthermore, on Friday June 18th, after digesting all three inserts and vector and running them on a gel, we did not see any NosT + stop DNA. Therefore, on Monday June 21, we began by digesting more NosT + stop and V0120 vector with xba1 and pstI fast digestive enzymes. The gel showed DNA length to be consistent with the given parts. (See gel below) | ||
| - | [[Image:digestion_gel1.jpg|| | + | [[Image:digestion_gel1.jpg||150px]] |
*Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. pENTCUP2 promoter. 3. NosT terminator. 4. NosT + stop terminator 5. V0120 digested. | *Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. pENTCUP2 promoter. 3. NosT terminator. 4. NosT + stop terminator 5. V0120 digested. | ||
| - | [[Image:digestion_gel2.jpg|| | + | [[Image:digestion_gel2.jpg||150px]] |
*Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. NosT + stop terminator. 3. V0120 digested. | *Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. NosT + stop terminator. 3. V0120 digested. | ||
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In order to get a better understanding of the problem with our ligation, we ran a diagnostic gel with the V0120 backbone and vectors B15 and B21. | In order to get a better understanding of the problem with our ligation, we ran a diagnostic gel with the V0120 backbone and vectors B15 and B21. | ||
| - | [[Image:V0120_gel_longer.jpg|| | + | [[Image:V0120_gel_longer.jpg||250px]] |
Gel Lanes: | Gel Lanes: | ||
1. 1 kb plus ladder | 1. 1 kb plus ladder | ||
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We began a slow enzyme xba1/pstI digest on Friday, but the gel was run in mismatching buffers (TAE and TBE). | We began a slow enzyme xba1/pstI digest on Friday, but the gel was run in mismatching buffers (TAE and TBE). | ||
| - | [[Image:slowdigest.jpg|| | + | [[Image:slowdigest.jpg||150px]] |
* Gel Lanes (inserts and vector digested with xba1/pstI): 1. 1 kb plus ladder. 2. pENTCUP2 3. NosT 4. NosT & stop 5. v0120 | * Gel Lanes (inserts and vector digested with xba1/pstI): 1. 1 kb plus ladder. 2. pENTCUP2 3. NosT 4. NosT & stop 5. v0120 | ||
Revision as of 00:36, 25 October 2010
notebook calendar [ top ]
06-14-2010 [ top ]
- Miraculin and brazzein constructs due to arrive on Wednesday from Mr. Gene
BioBrick Transformation
BioBrick parts from the 2010 iGEM kit were transformed and grown in highly competent TURBO bacteria.
- Wintergreen Scent Pathway:
BBa_J45700 - entire pathway, Ampicillin
BBa_J45004 - BSMT1 only, Ampicillin
(Not in 2010 BB Kit: BBa_J45017 - PchB, PchA)
- Banana Scent Pathway:
BBa_J45250 - ATF3 + Promoter, Ampicillin?
BBa_J45014 - ATF3 only, Ampicillin
(Not in BB 2010 Kit: BBa_J45400 - BAT2 and THI3)
06-15-2010 [ top ]
Primer Designs for Agrobacterium Vector
- Primers were designed to amplify from the Expression Series pORE Agrobacterium plasmid (e3) 1)the pENTcup2 promoter, 2) the tNOS stop sequence, 3) the tNOS stop sequence + additional stop codon and 4) the pHLP promoter.
Note: the NOSterm_BB_R primer works for both tNOS and tNOS+STOP codon sequences.
pENTcup2_BB_F CCTTTCTAGAGGGATCTTCTGCAAGCATCT
pENTcup2_BB_R AAGGCTGCAGCGGCCGCTACTAGTTCCGGTGGGTTTTGAGGT
STOP_NOSterm_BB_F CCTTTCTAGATGAGATCGTTCAAACATTTGG
NOSterm_BB_F CCTTTCTAGAGATCGTTCAAACATTTGGCA
NOSterm_BB_R AAGGCTGCAGCGGCCGCTACTAGTGATCTAGTAACATAGATGACA
pHPL_BB_F CCTTTCTAGAAACGTGGATACTTGGCAGTG
pHPL_BB_R AAGGCTGCAGCGGCCGCTACTAGTCTTTTGAGCTTAGAGGTTTTT
BioBrick Transformation
- Colonies were observed after overnight culture growth, but in low quantities.
- J45700 and J45004 (both Wintergreen Pathway) showed minimal number of colonies on both 10μL and 100μL cultures.
- J45250 and J45014 (both Banana Pathway) showed no colonies on either the 10μL or 100μL cultures.
Codon Usage in Arabidopsis
Using http://gcua.schoedl.de/
Valencene Extraction
Used RNeasy Plant Mini Kit to extract RNA from the flavedo of an Organic Valencia Orange.
06-16-2010 [ top ]
MiniPrep
- MiniPrep of Wintergreen parts from Registry (J45004 and J45700) following Qiagen MiniPrep protocol. MiniPrep three samples of each part.
- DNA concentrations:
J45004-1: 59.1 ng/μL
J45004-2: 72.9 ng/μL
J45004-3: 88.1 ng/μL
J45700-1: 146.7 ng/μL
J45700-2: 187.4 ng/μL
J45700-3: 175.5 ng/μL
Digestion with Enzymes
- For J45004, we added: 9μL DNA, 1μL buffer, 1μL xbaI restriction enzyme (slow), and .5μL pstI restriction enzyme (fast).
- For J45700, we added 5μL DNA, 4μL H2O, 1μL buffer, 1μL xbaI restriction enzyme (slow), and .5μL pstI restriction enzyme (fast).
- We let mixtures sit for 30 minutes due to the use of xbaI restriction enzyme (slow). After the 30 minutes, we added 2.5μL dye to each mix.
Gel
- We loaded 12.5μL of 1kb ladder to well 1 of the gel (numbered left to right). We then loaded 12.5μL of J45004-1, J45004-2, and J45004-3 to wells 2,3, and 4, respectively. We loaded J45700-1, J45700-2, J4500-3 in wells 5, 6, and 7, respectively (see images below for well locations).
- Ran on 1% agarose gel.
06-17-2010 [ top ]
PCR Purification of pORE Vector Parts
Following QIAgen PCR Purification Kit Protocol the following PCR products were purified:
- pENTCUP2 Promoter - 16.1 ng/μL
- NOSterminator Sequence - 76.3 ng/μL
- STOP codon + NOSterminator Sequence - 76.5 ng/μL
To do: follow up with restriction digest ✓ and Agarose gel ✓ to confirm PCR and PCR purification.
Restriction Digest and Agarose Gel
Restriction Digest reactions were set up as follows:
pENTCUP2 Promoter:
- 27μL PCR product
- 3μL Loading Buffer w/ dye
- 1μL Xba1 Fast Enzyme
- 1μL Pst1 Fast Enzyme
NOSterm and NOSterm + STOP:
- 9μL PCR product
- 1μL Loading Buffer w/ dye
- 0.5μL Xba1 Fast Enzyme
- 0.5μL Pst1 Fast Enzyme
BioBrick Plasmid V0120 (Ampicillin Resistance):
- 3μL DNA
- 1μL Loading Buffer w/ dye
- 6μL diH2O
- 0.5μL Xba1 Fast Enzyme
- 0.5μL Pst1 Fast Enzyme
Reactions were allowed to proceed for 45 minutes at 37°C.
06-18-2010 [ top ]
06-21-2010 [ top ]
06-22-2010 [ top ]
06-23-2010 [ top ]
06-24-2010 [ top ]
06-25-2010 [ top ]
We began this week trying to ligate the pENTCUP2 promoter, NosT terminator, and NosT terminator plus stop codon into the V0120 vector. We ran into several problems during this process.
We had previously digested the three inserts as well as the promoter with XbaI and PstI fast digest enzymes, ligated, and transformed the ligated vectors into e. coli. Unfortunately, we did not find any colonies of cells after over 14 hours of incubation. Furthermore, on Friday June 18th, after digesting all three inserts and vector and running them on a gel, we did not see any NosT + stop DNA. Therefore, on Monday June 21, we began by digesting more NosT + stop and V0120 vector with xba1 and pstI fast digestive enzymes. The gel showed DNA length to be consistent with the given parts. (See gel below)
- Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. pENTCUP2 promoter. 3. NosT terminator. 4. NosT + stop terminator 5. V0120 digested.
- Gel Lanes (both inserts and vector were digested with xbaI/pstI): 1. 1kb plus ladder. 2. NosT + stop terminator. 3. V0120 digested.
Upon gel extraction and gel purification, we ligated the inserts into the vectors with a 2:1 insert to vector ratio (previously we had been using a 4:1 insert to vector ratio). We then transformed the plasmids into e.coli and plated; no colony growth was seen the next morning.
We used Team Vector's R3 ligation (they have successfully ligated and transformed) as a positive control. However, the bacteria containing the ligated plasmids were plated on Ampicillin plates, which turned out to be the wrong resistance.
Troubleshooting
In order to get a better understanding of the problem with our ligation, we ran a diagnostic gel with the V0120 backbone and vectors B15 and B21.
Gel Lanes: 1. 1 kb plus ladder 2. v0120 undigested 3. v0120 eco/spe 4. v0120 eco/xba 5. v0120 spe/pstI 6. v0120 xba/pst 7. v0120 ecoRI 8. v0120 xba1 9. v0120 pstI 10. v0120 spe 11. blank 12. B15 (StrepII tag) xba/pstI 13. B21 (YFP) xba/pstI
We concluded from the gel that xba1 is the problem in our ligation step. The pattern of bands in the v0120 xba1/pstI digest along with the v0120 xba1 digest illustrate that xba1 is not cutting correctly.
We began a slow enzyme xba1/pstI digest on Friday, but the gel was run in mismatching buffers (TAE and TBE).
- Gel Lanes (inserts and vector digested with xba1/pstI): 1. 1 kb plus ladder. 2. pENTCUP2 3. NosT 4. NosT & stop 5. v0120
Valencene
Digestion of PCR products aimed to isolate valencene gene showed very short length on gel. These are not the correct size and are most likely primer dimers. PCR products were digested with EcoRI/SpeI. 5 μL of each sample was digested with pstI to be sure that the pstI site was in the sequence of DNA.
- Gel Lanes: 1. 1 kb plus ladder. 2. Flavedo EcoRI/SpeI. 3. Flavedo PstI 4. Open 5. Fruit EcoRI/SpeI. 6. Fruit pstI
