noun Biochemistry.

  1. an enzyme that catalyzes the cleavage of a polypeptide or protein at interior positions of the amino acid chain.


  1. any proteolytic enzyme, such as pepsin, that splits a protein into smaller peptide fragmentsAlso called: proteinase Compare exopeptidase


  1. Any of a large group of enzymes that catalyze the hydrolysis of peptide bonds in the interior of a polypeptide chain or protein molecule.
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