Endopeptidase
Endopeptidase — A protease that cleaves peptide bonds within the interior of a polypeptide chain, as opposed to exopeptidases that cleave at termini.
What Is an Endopeptidase?
An endopeptidase (endoprotease) is an enzyme that cleaves peptide bonds within the interior of a polypeptide chain, as opposed to exopeptidases that remove terminal residues. Endopeptidases are the primary enzymes responsible for peptide proteolytic degradation in biological systems and are classified by their catalytic mechanism into serine, cysteine, aspartyl, and metalloproteases.
Key Endopeptidases in Peptide Research
- Neprilysin (NEP): Zinc metalloprotease. Major degradation enzyme for enkephalins, bradykinin, atrial natriuretic peptide
- DPP-IV: Serine protease. Cleaves N-terminal dipeptides after Pro or Ala. Degrades GLP-1, GIP. DPP-IV inhibitors (gliptins) are diabetes drugs
- ACE: Zinc metallopeptidase. Converts angiotensin I to II, degrades bradykinin. ACE inhibitors are major cardiovascular drugs
- Insulin-degrading enzyme (IDE): Zinc metalloprotease. Primary clearance enzyme for insulin and amyloid-beta
Frequently Asked Questions
What is Endopeptidase?
A protease that cleaves peptide bonds within the interior of a polypeptide chain, as opposed to exopeptidases that cleave at termini.
Why is Endopeptidase important in peptide research?
Endopeptidase 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.