A unique membrane-bound, calcium-dependent endopeptidase with specificity toward paired basic residues in rat liver Golgi fractions

Kensaku Mizuno, Tomoko Nakamura, Hisayuki Matsuo

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A unique calcium-dependent endopeptidase specifically cleaving on the carboxyl side of paired basic residues was partially purified from Golgi membrane fractions of rat liver. The enzyme, with optimal pH at around 6.0, hydrolyzes synthetic peptides corresponding to the amino-terminal sequences of proalbumin and proparathyroid hormone at the carboxyl sides of paired basic residues (Arg-Arg and Lys-Arg), but peptides corresponding to the amino-terminal sequences of proalbumin variants, in which Arg-Arg at the site of cleavage is replaced by Arg-Gln or His-Arg, are not affected by the enzyme. From its strict substrate specificity and inhibitory spectrum, this enzyme appears to be a novel endopeptidase distinct from trypsin and cathepsin B and may be physiologically involved in proprotein processing.

Original languageEnglish
Pages (from-to)780-787
Number of pages8
JournalBiochemical and biophysical research communications
Volume164
Issue number2
DOIs
Publication statusPublished - 1989 Oct 31
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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