In the world of molecular research and protein analysis, having reliable tools to veri Development of a multifunctional toolkit of intrabody-based fy protein expression is essential. Over the years, I have worked extensively with various epitope tags, but the v5 peptide sequence remains one of my personal favorites due to its reliability and compact nature. If you are diving into the specifics of this tool, understanding its structural foundation is the first step toward successful e 19 Oct 2020—TheV5-tag is a popular epitope tag derived from the P and V proteins of the Simian Virus 5 (SV5) that is used to tag proteins in yeast, Read more xperimental design.
The Structural Foundation of the V5 Peptide
The V5 tag is essentially a small peptide sequence derived from the P/V proteins of paramyxovirus SV5. When I look at the technical specifications, it is fascinating how such a short chain can be so effective. The primary sequence is GKPIPNPLLGLDST, which corresponds to residues 95 to 108 of the P-subunit of simian virus 5 (SV5) RNA polymerase.
This peptide is typically composed of all 14 amino acids, though I have encountered applications where a truncated, 9-amino acid version (IPNPLLGLD) is utilized. However, for most standard workflows, sticking to the standard 14-residue length is the gold standard. The amino acid sequence is Gly-Lys-Pro-Ile-Pro-Asn-Pro-Leu-Leu-Gly-Leu-Asp-Ser-Thr, and when ordering synthetic versions, you might see it formatted as H-Gly-Lys-Pro Customer Review ; Molecular Weight. 1535.66 ; Formula. C64H108N16O20.C2HF3O ; Appearance. Solid ; Color. White to off-white ;Sequence. Gly-Lys-Pro-Ile-Pro-Asn-Pro- Read more -Ile-Pro-Asn-Pro-Leu-Leu-Gly-Leu-Asp-Ser-Thr-OH. In some specialized synthesis protocols, you may even encounter an N-Cys modification to facilitate specific conjugation chemistry.
Practical Applications and Utility
The primary reason this V5 epitope tag is a short peptide sequence is its versatility. It is effectively used to label a protein Development of a V5-tag–directed nanobody and its - PMC of interest, allowing researchers to visualize or isolate the target protein with high specificity. Because these are sequences of around 10 to 15 amino acids, they rarely interfere with the folding or function of the host protein, which is a major advantage during complex expression studies.
In my own work, I have found that the V5-tag peptide is exceptionally useful for competitive elution. Specifically, the V5 peptide can be used to competitively elute V5-tagged fusion proteins from immobilized anti-V5 affinity resins. This process provides a gentle way to recover high-purity protein complexes without harsh denaturing conditions.
Technical Considerations
When integrating the V5 tag into your research, you will likely encounter various Mammalian vector for expressing C-terminally V5- and 6xHis-tagged proteins. Whether you are cloning at TheV5tag is usually used with all 14 amino acids (GKPIPNPLLGLDST), although it has also been used with a shorter 9amino acid sequence(IPNPLLGLD).Read more the N-terminus or C-terminus, the stability of the GKPIPNPLLGLDST motif is robust.
I’ve often been asked about the molecular weight. The V5 peptide generally has a molecular weight in the range of 1421 to 1535 Da, depending on the salt form (such as TFA) and the specific synthesis purity. When preparing your buffers, keep in V5 Antibodies mind that this Sequence is highly soluble in aqueous solutions, making it a dream to work with in standard PBS-based elution protocols.
Final Thoughts on Working with V5
Whether you are performing western blots, immunoprecipitation, or structural studies, the V5 system is a workhorse. It is a well-characterized peptide that simplifies the detection of recombinant proteins. By focusing on the Sequence. GKPIPNPLLGLDST and ensuring your expression vectors are correctly mapped, you minimize the common pitfalls associated with epitope tagging.
For anyone just starting to experiment with this tag, remember that the specificity of your results will largely depend on the quality of the antibodies used. Stick to well-validated reagents, and Like c-myc and HA tags, theV5tag is a small epitope tag (IPNPLLGLD), which can be placed by molecular cloning at the N- or C-terminus of a protein of choice.Read more this small peptide sequence derived from the P/V proteins of paramyxovirus SV5 will undoubtedly become a staple in your laboratory toolkit.