ETHZ/Biology/Lab
From 2007.igem.org
![Eth zh logo 4.png](/wiki/images/3/39/Eth_zh_logo_4.png)
For all our cloning procedures we used standard protocols according to SAMBROOK and RUSSELL Molecular Cloning: A Laboratory Manual.
Contents |
Strains
We used the following E. coli strains:
[http://openwetware.org/wiki/E._coli_genotypes#TOP10_.28Invitrogen.29|E. coli Top10 (Invitrogen):]
- This strain has a streptomycin resistance
- Genotype: F’ {tetR}, mcrA, Δ(mrr-hsdRMS-mcrBC), φ80 lacZ ΔM15, ΔlacX74, deoR, recA1, araD139 Δ(ara-leu)7679, galU, galK, λ-, rpsL,endA1, nupG
- For further information please [http://openwetware.org/wiki/E._coli_genotypes#TOP10_.28Invitrogen.29| click here]
- References:
- Casdaban, M. and Cohen, S. (1980) J Mol Biol 138:179 PMID 6997493
- Grant, S.G.N. et al. (1990) Proc. Natl. Acad. Sci. USA 87: 4645-4649 PMID 2162051
- Casdaban, M. and Cohen, S. (1980) J Mol Biol 138:179 PMID 6997493
[http://openwetware.org/wiki/E._coli_genotypes#JM101|E. coli JM101:]
- We call them Jimmys
- This strain is the original blue/white cloning strain
- Genotype: glnV44 thi-1 Δ(lac-proAB) F'[lacIqZΔM15 traD36 proAB+]
- For further information please [http://openwetware.org/wiki/E._coli_genotypes#JM101| click here]
- Reference:
- Messing, J. et al. (1981) Nucleic Acids Res. 9, 309; Yanisch-Perron, C., Vieira, J., and Messing, J. (1985) Gene 33, 103
Plasmids
For our system we needed three plasmids with different origins of replication and antibiotic resistances. We decided to take low copy plasmids. We decided to use the following plasmids, which we wanted modify so that they would become compatible to the Biobrick Library multiple cloning site:
Plasmid | Resistances | Copy number | Origin | Map |
---|---|---|---|---|
pbr322 | ampicillin | 15-20 [1] | pMB1 | ![]() |
pck01 | chloramphenicol | 5-12 [1] | pSC101 | |
pacyc177 | kanamycin | 10-12 [1] | p15A |
In this page, you can find information on laboratory conducted to construct EducatETH E.coli. The system parts are presented again, their assembly into plasmids and the cloning plan are explained and all lab notes taken by the ETH Zurich team are accessible. If you are trying to construct EducatETH E.coli at your lab, the section Problems we faced might be useful to you. If you want to see the whole biological design of the system, please visit the Biology Pespective. Finally, photos of our lab experience are accessible under Pictures!
Todo: decide what happens with lab book (here)
Cloning plan
Parts assignment into plasmids
Three plasmids are used for the EducatETH E.coli system parts as follows:
plasmid | resistance | copy type | contents | comments |
---|---|---|---|---|
pbr322 | ampicillin | high | 1,2,3 | constitutive subsystem |
pck01 | chloramphenicol | low | 4,5,8,9 | reporting subsystem |
pacyc177 | kanamycin | low | 6,7,10,11 | learning subsystem, reporting subsystem |
It is important to insert parts responsible for the production of fluorescent proteins in low copy plasmids, as they are potentially harmful for the cell. Unfortunately, working with low copy plasmids makes the procedure more demanding in the lab.
Linkers
Because the plasmids used were not standard plasmids found in the registry, but came from the lab where we work, linkers compatible with the standard BioBrick assembly have to be used in order to work with them. The list of all linkers is the following:
Linker | Plasmid |
---|---|
pbr322-1 | pbr322 |
pbr322-2 | pbr322 |
pbr322-3 | pbr322 |
pbr322-4 | pbr322 |
pck01 | pck01 |
pck01-2 | pck01 |
pacyc177-1 | pacyc177 |
pacyc177-2 | pacyc177 |
Note that four linkers are tested for pbr322, as two are used for the tetracycline-resistance version of pbr322 and two are used for the ampicillin-resistnace version.
Procedure
The standard BioBrick assembly will be used to put the parts in the plasmids. Detailed information on how the BioBrick part fabrication works can be found [http://openwetware.org/wiki/Synthetic_Biology:BioBricks/Part_fabrication here]. For a shorter explanation of how to assemble 2 parts together check [http://partsregistry.org/Assembly:Standard_assembly here]. Note that the composite part is constructed from the end to the beginning, i.e. each new part is inserted before the existing one. In the following, the plasmid containing the new part to be inserted will be referred to as the donor and the plasmid accepting the new part will be referred to as the acceptor. Composite pars made of parts a and b are denoted a.b.Plasmid 1 (pbr322ap)
- Put parts 1,2,3 in pbr322ap plasmids.
- Merge plasmid containing part 2 (donor) with plasmid containing part 3 (acceptor). You should get a plasmid containing a 2.3 composite part.
- Merge plasmid containing part 1 (donor) with plasmid containing composite part 2.3 (acceptor). You should get a plasmid containing a 1.2.3 composite part.
Plasmid 2 (pck01cm)
- Put parts 4,5,8,9 in pck01cm plasmids.
- Merge plasmid containing part 4 (donor) with plasmid containing part 5 (acceptor). You should get a plasmid containing a 4.5 composite part.
- Merge plasmid containing part 8 (donor) with plasmid containing part 9 (acceptor). You should get a plasmid containing a 8.9 composite part. Note: this step can be done simultaneously with the above.
- Merge plasmid containing composite part 4.5 (donor) with plasmid containing composite part 8.9 (acceptor). You should get a plasmid containing a 4.5.8.9 composite part.
Plasmid 3 (pacyc177km)
- Put parts 6,7,10,11 in pacyc177km plasmids.
- Merge plasmid containing part 6 (donor) with plasmid containing part 7 (acceptor). You should get a plasmid containing a 6.7 composite part.
- Merge plasmid containing part 10 (donor) with plasmid containing part 11 (acceptor). You should get a plasmid containing a 10.11 composite part. Note: this step can be done simultaneously with the above.
- Merge plasmid containing composite part 6.7 (donor) with plasmid containing composite part 10.11 (acceptor). You should get a plasmid containing a 6.7.10.11 composite part.
Labbook
References
[1] [http://www1.qiagen.com/faq/faqview.aspx?faqid=350&SearchText=&FaqCategoryId=0&MenuItemId=0&catalog=1&ProductLineId=1000228 QIAGEN FAQs]
[x] [http://partsregistry.org/Assembly:Standard_assembly Standard Assembly Process]