Secretion of nuclease across the outer membrane of Serratia marcescens and its energy requirements

Yousin Suh, Michael J. Benedik

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Extracellular secretion of Serratia marcescens nuclease occurs as a two- step process via a periplasmic intermediate. Unlike other extracellular proteins secreted by gram-negative bacteria by the general secretory pathway, nuclease accumulates in the periplasm in its active form for an unusually long time before its export into the growth medium. The energy requirements for extracellular secretion of nuclease from the periplasm were investigated. Our results suggest that the second step of secretion across the outer membrane is dependent upon the external pH; acidic pH effectively but reversibly blocks extracellular secretion. However, electrochemical proton gradient, and possibly ATP hydrolysis, are not required for this step. We suggest that nuclease uses a novel mechanism for the second step of secretion in S. marcescens.

Original languageEnglish (US)
Pages (from-to)677-683
Number of pages7
JournalJournal of Bacteriology
Volume179
Issue number3
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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