Apr 1, 1994

Ostrich (Struthio camelus) carboxypeptidase A: purification, kinetic properties and characterization of the pancreatic enzyme

The International Journal of Biochemistry
G BradleyW Oelofsen


1. Carboxypeptidase A beta and carboxypeptidase A tau-type from the pancreas of the ostrich were purified by water extraction of acetone powder, aminobenzylsuccinic acid affinity and hydroxylapatite chromatography. 2. The final preparations were homogeneous when subjected to SDS-PAGE and PAGE. The M(r) values obtained from SDS-PAGE for CPA beta and CPA tau-type were 34,600 and 34,400, respectively. 3. The effects of inhibitors (1,10 phenanthroline and indole-3-acetic acid), pH and temperature on CPA activity were examined. Ki-values for CPI, PPA, D-phe, D-trp and aminobenzylsuccinic acid were determined. 4. Km, kcat and kcat/Km values were determined for hipp-phe, cbz-gly-phe, cbz-(gly)2-phe, cbz-gly-leu, cbz-(gly)2-leu and cbz-(gly)2-val. 5. N-terminal sequencing and amino acid analysis were performed for CPA beta and CPA tau-type.

  • References18
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Mentioned in this Paper

Carboxypeptidase A
Carboxypeptidase A5
Benign Tumor of Pancreas
1,10-phenanthroline, zinc salt
Homologous Sequences, Amino Acid

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