pSF-CMV-COOH-FLAG1 (OG308) C-Terminal FLAG® Tag Plasmid

Product Code: OG308R1
Product Code: OG308C1
Product Code: OG308G1

Product Description

C-terminal FLAG epitope tag expression plasmid (Frame 1). This vector is designed to add a FLAG tag to the end of your gene of interest.

Plasmid Information

Product Name: pSF-CMV-COOH-FLAG1

Product Code: OG308

Size (bp): 4241 bp

Bacterial Antibiotic Selection: KanR

Origin and Compatibility: pUC high copy derived from pBR322

Bacterial Copy Number: 500-700 per cell

Promoter: Cytomegalovirus (CMV) immediate early promoter

Plasmid Purpose:

This vector adds a FLAG tag that allows protein detection or purification using antibodies against the peptide. The FLAG tag will be positioned at the 3 prime end (C terminus) of a gene (expressed protein) in the primary MCS (NotI to XbaI but XbaI is ablated in this vector because of the stop codon would prevent read through into the tag). The FLAG tag coding sequence is DYKDDDDK. This sequence contains an enterokinase cleavage sequence (DDDDK) however when used as a C terminal tag this will not remove the tag because it cleaves after the final lysine which will be the final amino acid in any protein produced from this vector. The FLAG tag coding sequence is positioned immediately downstream on the XhoI restriction site.

Promoter Expression Level:

This plasmid contains the mammalian CMV promoter to drive gene expression. We have tested all of our mammalian promoters in a range of cell types and CMV is consistently the strongest in those we have studied. However there are many reports of the CMV promoter demonstrating silencing by methylation in long-term culture. For this reason we stock a range of other promoters that are compatible with this plasmid and are available on request.

FLAG is a registered trademark of the Sigma Aldrich Corporation.

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Transcription Termination:

This plasmid contains three alternative transcription terminators for mammalian bacterial and bacteriophage (T7) expression. This means that only the promoter needs to be changed to alter the expression system you are using. We sell multiple promoters that can be used in each of these systems. The presence of each terminator does not reduce expression in the alternative systems.

Cloning in a Gene:

There is a start codon in the NcoI site can be removed by digestion with KpnI if required. The MCS for gene insertions extends from NotI to XbaI. There are built in Shine-Dalgarno and KOZAK sequences aligned with the start codon within the NcoI restriction site. If these are removed you will need to add a ribosomal entry site to the 5 prime end of your gene for optimal expression.

Intellectual Property Status

This product is part of our SnapFastâ„¢ plasmid range, for more information on the intellectual property status of this plasmid please click here. For more information on the terms of our licences please click here.