Information within the mature LamB protein necessary for localization to the outer membrane of E coli K12

Spenser A. Benson, Thomas J. Silhavy

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

It has been proposed that the efficient localization of the outer membrane protein LamB requires a functional signal sequence and at least two additional regions contained within the mature protein. We define these regions more precisely by deletion analysis, and we describe methods for cloning deleterious lacZ fusions onto high-copy-number plasmids and generating in-frame deletions. Analysis of the effects of a series of internal lamB deletions on the export of a LamB-LacZ hybrid protein and of the LamB protein itself indicates that necessary informational signal(s) required for localization lie at the amino-terminal end of the protein. In addition, our analysis indicates that there is a region of information close to or within the fusion joint of the largest lamB-lacZ fusion that increases the efficiency of the export process. A unique deletion that removes a protein segment from amino acid 70 to 200 appears to prevent proteolytic removal of the signal sequence. Nevertheless, the mutant protein is exported to the outer membrane.

Original languageEnglish (US)
Pages (from-to)1325-1335
Number of pages11
JournalCell
Volume32
Issue number4
DOIs
StatePublished - Apr 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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