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#TEV protease

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Hybridization

TEV protease in TAP recognizes:

Tobacco Etch Virus protease exhibits stringent specificity for seven amino acid consensus motif Glu-Asn-Leu-Tyr-Phe-Gln-Gly or Ser, cleaving between glutamine and glycine or serine residues. This extended recognition ensures minimal off-target cleavage within mammalian proteins, making it ideal for selective release of protein complexes during Tandem Affinity Purification. Recognition sequence is incorporated between two affinity tags in TAP construct. ATG represents translation initiation codon, calmodulin site binds calcium-dependent calmodulin, and Protein A motif binds immunoglobulin. Seven-residue specificity underlies its utility as biotechnological tool for precise proteolysis.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Hybridization

What is the function of TEV protease in TAP?

Tandem Affinity Purification employs TEV protease as a highly specific cleavage tool to release protein complexes between successive affinity steps. TAP tag typically contains Protein A IgG-binding domains, a TEV recognition site, and Calmodulin Binding Peptide. After first purification on IgG Sepharose, TEV protease, derived from Tobacco Etch Virus, recognizes consensus sequence ENLYFQG and cleaves specifically, liberating target complex under mild conditions. This enzymatic cleavage preserves native interactions and eliminates contaminants. Function is not tag synthesis, immobilization, or labeling, but precise sequence-specific proteolysis enabling second purification step.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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