pSF-CMV-NH2-FLAG-EKT3 (OG81) N-Terminal FLAG® Tag Plasmid

Price: $253.64
Product code: OG81

Product Description

Adds an N terminal FLAG tag (frame 3) to a gene inserted into our main multiple cloning site. Also contains the CMV promoter to drive transcription3.

Plasmid Information

Product Name: pSF-CMV-NH2-FLAG-EKT3

Product Code: OG81

Size (bp): 4285 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 plasmid adds a FLAG epitope tag to the N-terminus of a protein that is encoded within the multiple cloning site. This tag allows the detection and purification of a tagged protein using antibodies raised against the FLAG epitope. The FLAG tag coding sequence is DYKDDDDK. This tag encodes an enterokinase cleavage site (DDDDK) within it that allows the removal of the N-terminal tag if required.

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:

This vector has been designed to allow the addition of a peptide tag to the end of a protein of interest using standard cloning techniques.

Multiple Cloning Site Notes:

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 however the tag resides between the NotI and HindIII sites. There are Shine-Dalgarno sequences and KOZAK sequences aligned with the start codon of the peptide tag.

The ClaI to NheI sites have other functions such as adding C-terminal peptide tags second promoters or IRES expression components. The BsgI and BseRI restriction sites cleave within the stop codon in the XbaI site and allow the retrospective fusion of C-terminal peptide tags sequences if the stop codon is placed in this position.

Intellectual Property Status

This product is part of our SnapFast plasmid range, for more information on the Intellectual property status of this plasmid please click here