Protease
Protease — An enzyme that catalyzes the hydrolysis of peptide bonds, breaking down proteins and peptides into smaller fragments or individual amino acids.
What Is a Protease?
A protease (peptidase, proteinase) is an enzyme that cleaves peptide bonds by hydrolysis. Proteases are classified by catalytic mechanism: serine (chymotrypsin, trypsin), cysteine (caspases, cathepsins), aspartyl (pepsin, HIV protease), metallo (MMPs, ACE), and threonine (proteasome). Protease resistance is the central challenge in peptide drug design.
Significance
- Degradation: Plasma and tissue proteases limit peptide half-life to minutes
- Stabilization: D-amino acids, N-methylation, cyclization resist protease cleavage
- Drug targets: HIV protease, HCV NS3/4A, DPP-IV, ACE targeted by peptide/peptidomimetic inhibitors
Frequently Asked Questions
What is Protease?
An enzyme that catalyzes the hydrolysis of peptide bonds, breaking down proteins and peptides into smaller fragments or individual amino acids.
Why is Protease important in peptide research?
Protease is a fundamental concept in biochemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.