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SecA protein: Autoregulated initiator of secretory precursor protein translocation across theE. coli plasma membrane

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Abstract

Several classes ofsecA mutants have been isolated which reveal the essential role of this gene product forE. coli cell envelope protein secretion. SecA-dependent,in vitro protein translocation systems have been utilized to show that SecA is an essential, plasma membrane-associated, protein translocation factor, and that SecA's ATPase activity appears to play an essential but as yet undefined role in this process. Cell fractionation studies suggested that SecA protein is in a dynamic state within the cell, occurring in soluble, peripheral, and integral membraneous states. These data have been used to argue that SecA is likely to promote the initial insertion of secretory precursor proteins into the plasma membrane in a manner dependent on ATP hydrolysis. The protein secretion capability of the cell has been shown to translationally regulatesecA expression with SecA protein serving as an autogenous repressor, although the exact mechanism and purpose of this regulation need to be defined further.

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Authors and Affiliations

  1. Department of Microbiology, State University of New York at Stony Brook, 11794, Stony Brook, New York

    Donald B. Oliver, Robert J. Cabelli & Gregory P. Jarosik

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  1. Donald B. Oliver
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  2. Robert J. Cabelli
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Oliver, D.B., Cabelli, R.J. & Jarosik, G.P. SecA protein: Autoregulated initiator of secretory precursor protein translocation across theE. coli plasma membrane. J Bioenerg Biomembr 22, 311–336 (1990). https://doi.org/10.1007/BF00763170

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