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Post-translational N-glycosylation of a truncated form of a peptide processing enzyme.

Authors
  • Kolhekar, A S
  • Quon, A S
  • Berard, C A
  • Mains, R E
  • Eipper, B A
Type
Published Article
Journal
The Journal of biological chemistry
Publication Date
Sep 04, 1998
Volume
273
Issue
36
Pages
23012–23018
Identifiers
PMID: 9722525
Source
Medline
License
Unknown

Abstract

Peptidylglycine alpha-amidating monooxygenase (PAM) catalyzes the carboxyl-terminal amidation of bioactive peptides through a two-step reaction involving the monooxygenase and lyase domains. PAM undergoes endoproteolytic cleavage in neuroendocrine cells in the lyase domain. To determine which of the two possible paired basic sites is utilized, truncated PAM proteins ending at these sites were stably expressed in Chinese hamster ovary cells. While characterizing the truncation mutants, it became apparent that N-glycosylation occurred post-translationally at the single site localized near the carboxyl terminus of the lyase domain. The post-translational N-glycosylation of this site does not require the newly synthesized protein to remain tightly bound to membranes. Both malfolded, secretion incompetent proteins and fully active, secreted proteins were subject to post-translational N-glycosylation.

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