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plasmid vector for molecular cloning

cloning vector, expression vector, molecular cloning vector, plasmid, plasmid vector, snapfast vector, vector


expressed in E. coli


buffered aqueous solution

mol wt

size 3857 bp

bacteria selection


Origin of replication

pUC (500 copies)

Peptide cleavage

no cleavage


Promoter name: OXB15
Promoter activity: constitutive
Promoter type: bacterial

reporter gene


shipped in


storage temp.


General description

PSF-OXB15 - STRONG PROMOTER E.COLI VECTOR contains a constitutive promoter for protein expression in E. coli. The promoter is called OXB15 and is one of a range of bacterial promoters that we sell with different levels of expression. OXB1 is the lowest/weakest and OXB20 is the highest. This promoter exhibits intermediate levels of expression. This plasmid vector does not require induction for activity.

Promoter Expression Level: This plasmid vector contains a strong constitutive E. coli promoter that was derived from the RecA promoter by random mutagenesis. It is part of our constitutive bacterial promoter range. This promoter (OXB15) shows the high levels of expression in the range with OXB1 showing the lowest level and OXB20 showing the highest level of expression. This cloning vector require no inducing agent for expression.


Cloning in a gene: PSF-OXB15 - STRONG PROMOTER E.COLI VECTOR has been designed to be compatible with a range of cloning techniques. The multiple cloning site contains a range of standard commonly used restriction sites for cloning. Using these sites genes can be inserted using standard cloning methods with DNA ligase. Other methods such as ligase independent cloning (LIC) Gibson Assembly InFusionHD or Seamless GeneArt can also be used and because all of our plasmids are based on the same backbone the same method can be used for cloning into all of our catalogue vectors.

Multiple cloning site notes: There are a few important sites within the MCS. These include the NcoI site the XbaI site and the BsgI and BseRI sites. The NcoI site contains a start codon that is immediately downstream of both a Kozak and Shine-Dalgarno ribosomal binding site. These allow for optimal positioning of genes when the start codon is placed in this location. If this is not required and you wish to use a downstream site for gene cloning you can remove the NcoI site by cleaving the plasmid with KpnI.

The XbaI site contains a stop codon. This stop codon is positioned in a specific position in relation to the BsgI and BseRI sites that are immediately downstream. When either BseRI or BsgI cleave the plasmid they produce a TA overhang from the stop codon in the XbaI site that is compatible with all of our peptide tag plasmids cut with the same sites. BseRI and BsgI sites are non-palindromic and cleave a defined number of bases away from their binding site.

Whenever we clone a gene into our multiple cloning site we always position the start and stop codon in the same positions in the MCS. If the start and ends of the genes are not compatible with NcoI and XbaI we extend the sequence to the nearest external sites but keep the start and stop codons locations consistent.


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Analysis Note

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Storage Class Code

12 - Non Combustible Liquids

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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