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A carboxypeptidase (EC number 3.4.16 - 3.4.18) is a protease enzyme that hydrolyzes (cleaves) a peptide bond at the carboxy-terminal (C-terminal) end of a protein or peptide. This is in contrast to an aminopeptidases , which cleave peptide bonds at the N-terminus of proteins.
Carboxypeptidase A and the target enzyme of Captopril, angiotensin-converting enzyme, have very similar structures, as they both contain a zinc ion within the active site. This allowed for a potent carboxypeptidase A inhibitor to be used to inhibit the enzyme and, thus, lower blood pressure through the renin-angiotensin-aldosterone system. [1]
Lysine carboxypeptidase's EC number is 3.4.17.3. The first number in an EC number indicates the main class that the enzyme belongs to (the options being oxidoreductases, transferases, hydrolases, lyases, isomerases, and ligases). Lysine carboxypeptidase belongs to class 3 which indicates that it is a hydrolase. Hydrolases use water to break ...
Carboxypeptidase E (CPE), also known as carboxypeptidase H (CPH) and enkephalin convertase, is an enzyme that in humans is encoded by the CPE gene. [5] This enzyme catalyzes the release of C-terminal arginine or lysine residues from polypeptides. CPE is involved in the biosynthesis of most neuropeptides and peptide hormones. [6]
Carboxypeptidase B (EC 3.4.17.2, protaminase, pancreatic carboxypeptidase B, tissue carboxypeptidase B, peptidyl-L-lysine [L-arginine]hydrolase) is a carboxypeptidase that preferentially cleaves off basic amino acids arginine and lysine from the C-terminus of a peptide.
Glutamate carboxypeptidase (EC 3.4.17.11, carboxypeptidase G, carboxypeptidase G1, carboxypeptidase G2, glutamyl carboxypeptidase, N-pteroyl-L-glutamate hydrolase) is an enzyme.
Carboxypeptidase M (EC 3.4.17.12, CPM) is an enzyme. [ 1 ] [ 2 ] [ 3 ] This enzyme catalyses the following chemical reaction Cleavage of C-terminal arginine or lysine residues from polypeptides
CPA3 has a pH optimum in the neutral to basic range. CPA3 functions together with endopeptidases secreted from mast cells such as chymases and tryptases to degrade proteins and peptides, including the apolipoprotein B component of LDL particles and angiotensin I. [9] [10] Upon mast cell activation and degranulation, CPA3, the chymases, and tryptases are released in complexes with heparin ...