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Team:Stockholm/19 August 2010
From 2010.igem.org
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**pEX | **pEX | ||
| - | + | ===Transfer of RFP into pEX=== | |
| - | + | ====Digestions==== | |
:[pEX] = 161 ng/μl<br /> | :[pEX] = 161 ng/μl<br /> | ||
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Proceeded to ligation ''without'' enzyme inactivation or DNA purification | Proceeded to ligation ''without'' enzyme inactivation or DNA purification | ||
| - | + | ====Ligation==== | |
[DNA] = 66.6 ng/μl | [DNA] = 66.6 ng/μl | ||
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| - | + | ====Transformation==== | |
| - | + | Transformation according to quick transformation protocol. 3 μl ligation mix. Cells plated onto 100 Amp LB agar. | |
====Assembly of SOD/yCCS-His into pSB1K3==== | ====Assembly of SOD/yCCS-His into pSB1K3==== | ||
Revision as of 22:30, 23 August 2010
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Contents |
Andreas
Site-directed mutagenesis of SOD & yCCS
Sequencing results
Received the sequencing results for m-SOD 1, m-SOD 2, m-yCCS 1 and m-yCCS 4 from Eurofins. Ran a nucleotide BLAST (BLASTn) alignment to verify successful site-directed mutagenesis.
- SOD 1: Failed (BLASTn results)
- Mutation still present
- SOD 2: Success (BLASTn results)
- Mutation removed
- yCCS 1: Success (BLASTn results)
- EcoRI site removed
- yCCS 4: Success (BLASTn results)
- EcoRI site removed
All sequences revealed an insertion in the Freiburg suffix, between PstI and SpeI sites. We were aware of this, and the insertion will be removed by digestion later.
BLASTn results also revealed three mutations in both yCCS sequences. A protein BLAST (BLASTp) alignment of the translated yCCS sequences revealed all three mutations as silent mutations (BLASTp results).
SOD 1 sample and glycerol stock will be discarded; the other clones are saved as verified.
Assembly of CPP⋅protein⋅His constructs
Brief introduction
Our goal is to assemble our CPPs together with our protein-coding genes and a His tag, in one of two ways:
- CPPs with N-part prefix (N-CPP): CPP⋅gene⋅His-tag
- CPPs with Freiburg prefix (C-CPP): His-tag⋅gene⋅CPP
A His-tag (BBa_K157011) is available from the Registry, carried on the pMA (BBa_K157000) plasmid (pMA.His). This has previously been extracted from one of our iGEM plates, and is available both as plasmid, and as transformed cells.
The CPPs have been requested as synthesized DNA genes, and should arrive soon.
At me and Mimmi's lab, yCCS and SOD are now successfully verified in pSB1C3 and ready for cloning.
Assembly and cloning strategies
Designed cloning strategies for the assembly of CPP⋅gene⋅His-tag and His-tag⋅gene⋅CPP; see drawings attached. We will use BioBrick 3A assembly, with vectors carrying the RFP cassette as out destination vector. pSB1A3, pSB1C3 and pSB1K3 are already available with RFP, but not yet pEX.
Cloning preparations
- New Km 50 LB agar plates
- 22 pcs
- ON cultures (colonies picked from plates stored in 4 °C, grown in 5 ml LB + antibiotic (pMA & pEX in Amp 100; pSB1K3 in Km 50), 37 °C, 250 rpm, ON)
- pMA.His
- pSB1K3.BBa_J04450 (pSB1K3.RFP)
- pEX
Transfer of RFP into pEX
Digestions
- [pEX] = 161 ng/μl
- [pSB1C3.RFP] = 148 ng/μl
| Digestion mix | |||
|---|---|---|---|
| [μl] | pSB1C3.RFP | pEX | Incubation: 37 °C, 30 min |
| 10X FD buffer | 3 | 3 | |
| dH2O | 1.5 | 2.5 | |
| 2 μg DNA | 13.5 | 12.5 | |
| FD XbaI | 1 | 1 | |
| FD PstI | 1 | 1 | |
| 30 | 30 | ||
Proceeded to ligation without enzyme inactivation or DNA purification
Ligation
[DNA] = 66.6 ng/μl
| Ligation mix | |||
|---|---|---|---|
| 100 ng vector (pEX) | 1.5 | 1/3 ratio | Incubation: 22 °C, 10 min |
| 165 ng insert (RFP) | 2.5 | ||
| 5X Rapid Lig. buffer | 4 | ||
| dH2O | 11 | ||
| T4 DNA ligase | 1 | ||
| 20 | |||
Transformation
Transformation according to quick transformation protocol. 3 μl ligation mix. Cells plated onto 100 Amp LB agar.
Assembly of SOD/yCCS-His into pSB1K3
(Step I of N-CPP cloning strategy)
Digestions performed by Mimmi, see section below.
All DNA concentrations in digestion tubes 66.6 ng/μl.
Ligation
| Ligation mix | |||
|---|---|---|---|
| [μl] | SOD | yCCS | Vector/insert ratio 1:3 Incubation: 22 °C, 10 min |
| 100 ng vector (pSB1K3) | 2.2 | 2.2 | |
| His insert | 4.9 | 4.9 | |
| SOD insert | 5.1 | - | |
| yCCS insert | - | 5.7 | |
| 5X Rapid Lig. buffer | 4.0 | 4.0 | |
| dH2O | 2.8 | 2.2 | |
| T4 DNA ligase | 1.0 | 1.0 | |
| 20 | 20 | ||
Transformation
Quick transformation according to protocol. 3 μl ligation mix. Cells plated onto Km 50 LB agar plates.
Mimmi
SOD / yCCS
Digestion
| pSB1C3.SOD/pSB1C3.yCCS | pMA.His | pSB1K3.RFP | |||||||
| 8< EcoRI + AgeI | 8< NgoMIV + PstI | 8< EcoRI + PstI | |||||||
| Mix | SOD | yCCS | His-tag | RFP | |||||
|---|---|---|---|---|---|---|---|---|---|
| sH2O | 7 | 6 | 14 | 11 | |||||
| DNA | 19 | 20 | 12 | 15 | |||||
| 10X FD buffer | 3 | 3 | 3 | 3 | |||||
| EcoRI | 0.5 | 0.5 | NgoMIV | 0.5 | EcoRI | 0.5 | |||
| AgeI | 0.5 | 0.5 | PstI | 0.5 | PstI | 0.5 | |||
| tot | 30µl | 30µl | tot | 30µl | tot | 30µl | |||
- Incubate with just NgoMIV in 37°C for 1h 30m
- Add the other restriction enzymes and incubate in 37°C for 30m
- Inactivate restriction enzymes in 80°C for 5m
