Last data update: 24 November 2020 04:18 CET
Plasmid name: pPLT10mTNFT3 (LMBP 3586)
|Price category:||Cat. 1 (cf. price list)|
|Status:||GeneCorner non-core plasmid|
|Cloned DNA:||Mouse tumor necrosis factor cDNA (Tnf, TNF); mature sequence|
|Promoter:||Phage λ major leftward promoter (λ PL)
Phage T7 gene 10 promoter (T7g10)
Phage T3 promoter
|Ribosome binding site (RBS) of the phage T7 gene 10 (T7g10)|
|Terminator:||Phage fd terminator
Phage T7 gene 10 terminator (T7g10)
|Selection marker:||Ampicillin (amp)|
|Replicon:||Escherichia coli plasmid pMB1 origin
Phage f1 origin
|Host range:||Escherichia coli; use strains with a cI function, cIts for PL controlled expression|
|Parental clone:||pLT10T3; pJBtrcmTNF|
|Further information:||This plasmid was constructed by inserting the mouse TNF gene as a NcoI (filled-in with Klenow polymerase) - XhoI fragment, between the NdeI (filled-in with Klenow polymerase) and XhoI sites of pLT10T3.
This is a useful phasmid for heterologous gene expression in Escherichia coli under control of the strong and efficiently regulatable λ PL or T7 gene 10 promoter. Transcriptional read-through from these promoters is minimized by the presence of a duplicated T7 transcription terminator sequence for the T7 RNA polymerase and a duplicated fd transcription terminator sequence for the E. coli RNA polymerase. Read-through transcription from other plasmid promoters is minimized by the clockwise orientation of the PL and T7 promoters relative to the anticlockwise orientation of the replication origin.
pPLT10mTNFT3 is provided with an antisense phage T3 promoter.
This phasmid also contains the replication origin of the single-stranded DNA phage f1, so that it can be rapidly switched between the plasmid and the phage mode (ssDNA) of replication. The latter requires infection with a helper phage, e.g. M13KO7.
For T7 driven expression use a strain containing a controllable T7 RNA polymerase gene, as well as a cI function: preferably a pT7POL plasmid (Mertens et al., Biotechnology 13 (1995), 175-179) or e.g. BL21(DE3)[pcI857]. Proceed as follows: first transform auxiliary plasmid, make competent cells again and then transform the expression plasmid.
Other name of the plasmid is pLT10mTNF3.
|EMBL Accession number:||M11731, view at EMBL, GenBank, DDBJ|
|Latest sequence update:||10/09/1997|
Nucleotide sequence around the Shine-Dalgarno (SD) position of the T7 gene 10 ribosome binding site: | 5' TAATACGACTCACTATA|GGGAGACCACAACGGTTTCCCTCTAGAAATAATTTTGTTTAACTT ---------------->| XbaI T7 promoter 1 2 3 4 5 6 7 TAAGAAGGAGATATACATATC ATG.GTA.AGA.TCA.AGT.AGT.CAA.. ------ --> mature, mouse TNF SD SD: Shine-Dalgarno. Punctuation indicates reading frame.
|Authenticity test:||The plasmid still needs to be subjected to the authenticity test.|
|History of deposit:||This plasmid was deposited by K. Keymeulen(1) (2) and Prof. Dr E. Remaut(1) (2).
(1) Department for Molecular Biomedical Research, VIB, Ghent, Belgium
(2) Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
|Restricted distribution:||- BCCM MTA|
|Distributed as:||H/P active culture or plasmid DNA|
|Host for distribution:||Escherichia coli K12 MC1061(λ)|
|Host reference:||Mertens et al., Gene 164 (1995), 9-15 [PMID: 7590329]
|Related host reference:||Casadaban et al., J. Mol. Biol. 138 (1980), 179-207 [PMID: 6997493]
|Cultivation medium:||LB-Lennox + ampicillin (100 μg/ml)|
|Other culture collection numbers:||-|
Note: Up-to-date, validated data are enclosed with the biological material. Nevertheless, these data are a snapshot at a given moment; further updates are always possible.