title: Cloning of cDNAs that encode human mast cell carboxypeptidase A, and comparison of the protein with mouse mast cell carboxypeptidase A and rat pancreatic carboxypeptidases.
abstract: Human skin and lung mast cells and rodent peritoneal mast cells contain a carboxypeptidase in their secretory granules. We have screened human lung cDNA libraries with a mouse mast cell carboxypeptidase A (MC-CPA) cDNA probe to isolate a near-full-length cDNA that encodes human MC-CPA. The 5' end of the human MC-CPA transcript was defined by direct mRNA sequencing and by isolation and partial sequencing of the human MC-CPA gene. Human MC-CPA is predicted to be translated as a 417 amino acid preproenzyme which includes a 15 amino acid signal peptide and a 94 amino acid activation peptide. The mature human MC-CPA enzyme has a predicted size of 36.1 kDa, a net positive charge of 16 at neutral pH, and 86% amino acid sequence identity with mouse MC-CPA. DNA blot analyses showed that human MC-CPA mRNA is transcribed from a single locus in the human genome. Comparison of the human MC-CPA with mouse MC-CPA and with three rat pancreatic carboxypeptidases shows that these enzymes are encoded by distinct but homologous genes.
authors.affiliation: Department of Medicine, Harvard Medical School, Boston, MA.
authors.forename: D S
authors.initials: DS
authors.lastname: Reynolds
authors.forename: D S
authors.initials: DS
authors.lastname: Gurley
authors.forename: R L
authors.initials: RL
authors.lastname: Stevens
authors.forename: D J
authors.initials: DJ
authors.lastname: Sugarbaker
authors.forename: K F
authors.initials: KF
authors.lastname: Austen
authors.forename: W E
authors.initials: WE
authors.lastname: Serafin
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002268:Carboxypeptidases / Q000235:genetics*; D043422:Carboxypeptidases A; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics* / Q000302:isolation & purification; D005796:Genes; D006801:Humans; D008407:Mast Cells / Q000201:enzymology*; D051379:Mice; D008969:Molecular Sequence Data; D010179:Pancreas / Q000201:enzymology*; D021382:Protein Sorting Signals / Q000235:genetics; D051381:Rats; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
chemical_list: D021382:Protein Sorting Signals; D004247:DNA; D002268:Carboxypeptidases; D043422:Carboxypeptidases A