Structural basis for the substrate specificity of tobacco etch virus protease

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Biology

Background:

• The tobacco etch virus (TEV) protease is widely utilized in biotechnology for its high sequence specificity in cleaving affinity tags from recombinant proteins.
• The precise molecular mechanisms underlying TEV protease's substrate recognition and selectivity remain incompletely understood.

Purpose of the Study:

• To elucidate the structural basis of substrate recognition and specificity in TEV protease.
• To provide insights for engineering TEV protease for enhanced biotechnological applications.

Main Methods:

• X-ray crystallography was employed to determine the structures of two TEV protease mutants (C151A and S219D) complexed with substrate and product peptides.
• Structural analysis focused on protein-ligand interactions to identify key determinants of substrate binding and cleavage.

Main Results:

• The crystal structures revealed virtually identical binding modes for both substrate and product peptides, indicating minimal perturbation by the mutations.
• Analysis of protein-ligand interactions delineated the structural features responsible for TEV protease's stringent substrate specificity.

Conclusions:

• The study provides a detailed structural understanding of how TEV protease achieves its high substrate selectivity.
• These findings offer a foundation for rationally reengineering TEV protease to optimize its performance in various biotechnological processes.