The carboxypeptidase A family can be divided into two subfamilies: carboxypeptidase H (regulatory) and carboxypeptidase A (digestive).[1] Members of the H family have longer C-termini than those of family A,[2] and carboxypeptidase M (a member of the H family) is bound to the membrane by a glycosylphosphatidylinositol anchor, unlike the majority of the M14 family, which are soluble.[1]

Zinc carboxypeptidase
Identifiers
SymbolPeptidase_M14
PfamPF00246
InterProIPR000834
PROSITEPDOC00123
SCOP21cbx / SCOPe / SUPFAM
CDDcd00596
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary
PDB1jqgA:127-412 2c1cA:128-415 1heeE:128-406

2abzA:128-406 1ellP:128-406 1cps :128-406 1bavD:128-406 1m4lA:128-406 1zlhA:128-406 4cpaB:128-406 1hduD:128-406 7cpa :128-406 1cpxA:128-406 1f57A:128-406 2ctb :128-406 1arm :128-406 5cpa :128-406 3cpaA:128-406 1ee3P:128-406 1yme :128-406 1cbx :128-406 1hdqA:128-406 1pytB:128-406 8cpa :128-406 6cpa :128-406 1iy7A:128-406 2ctc :128-406 1elmP:128-406 1arl :128-406 2boaB:129-408 1ayeA:127-404 1dtdA:127-404 1zg9C:125-404 1zg8A:125-404 1z5rA:125-404 1nsa :125-404 1zliA:125-404 1kwmA:125-404 1obr :113-402

1uwyA:28-303 1h8lA:16-291

The zinc ligands have been determined as two histidines and a glutamate, and the catalytic residue has been identified as a C-terminal glutamate, but these do not form the characteristic metalloprotease HEXXH motif.[1][3] Members of the carboxypeptidase A family are synthesised as inactive molecules with propeptides that must be cleaved to activate the enzyme. Structural studies of carboxypeptidases A and B reveal the propeptide to exist as a globular domain, followed by an extended alpha-helix; this shields the catalytic site, without specifically binding to it, while the substrate-binding site is blocked by making specific contacts.[1][4]

Other examples of protein families in this entry include:

  • Intron maturase
  • Putative mitochondrial processing peptidase alpha subunit
  • Superoxide dismutase [Mn] (EC 1.15.1.1)
  • Asparagine synthetase [glutamine-hydrolysing] 3 (EC 6.3.5.4)
  • Glucose-6-phosphate isomerase (EC 5.3.1.9)

Human proteins containing this domain

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AEBP1; AGBL1; AGBL2; AGBL3; AGBL4; AGBL5; AGTPBP1; CPA1; CPA2; CPA3; CPA4; CPA5; CPA6; CPB1; CPB2; CPD; CPE; CPM; CPN1; CPO; CPXM1; CPXM2; CPZ;

References

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  1. ^ a b c d Rawlings ND, Barrett AJ (1995). Evolutionary families of metallopeptidases. Meth. Enzymol. Vol. 248. pp. 183–228. doi:10.1016/0076-6879(95)48015-3. ISBN 978-0-12-182149-4. PMID 7674922.
  2. ^ Osterman AL, Grishin NV, Smulevitch SV, Zagnitko OP, Matz MV, Stepanov VM, Revina LP (1992). "Primary structure of carboxypeptidase T: delineation of functionally relevant features in Zn-carboxypeptidase family". J. Protein Chem. 11 (5): 561–570. doi:10.1007/bf01025034. PMID 1449602. S2CID 22920252.
  3. ^ Lipscomb WN, Rees DC, Lewis M (1983). "Refined crystal structure of carboxypeptidase A at 1.54 A resolution". J. Mol. Biol. 168 (2): 367–387. doi:10.1016/S0022-2836(83)80024-2. PMID 6887246.
  4. ^ Huber R, Guasch A, Coll M, Aviles FX (1992). "Three-dimensional structure of porcine pancreatic procarboxypeptidase A. A comparison of the A and B zymogens and their determinants for inhibition and activation". J. Mol. Biol. 224 (1): 141–157. doi:10.1016/0022-2836(92)90581-4. PMID 1548696.
This article incorporates text from the public domain Pfam and InterPro: IPR000834