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J Bacteriol. 2003 Nov;185(22):6719-22.

Translocon "pulling" of nascent SecM controls the duration of its translational pause and secretion-responsive secA regulation.

Author information

1
Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, Connecticut 06459, USA.

Abstract

SecA is an ATPase and motor protein that drives protein translocation across the bacterial plasma membrane. In Escherichia coli SecA levels are regulated by the secretion needs of the cell utilizing secM, which encodes a secreted protein. Previous studies demonstrated that this regulation requires a translational pause within secM, whose duration regulates the accessibility of the secA Shine-Dalgarno sequence on secM secA mRNA. Here we provide evidence that translocon "pulling" of nascent SecM is what regulates the duration of the secM translational pause, and thus secA expression levels, thereby providing direct support for this model.

PMID:
14594848
PMCID:
PMC262105
DOI:
10.1128/jb.185.22.6719-6722.2003
[Indexed for MEDLINE]
Free PMC Article

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