Direct Interaction of the EpsL and EpsM Proteins of the General Secretion Apparatus in Vibrio cholerae
10.1128/jb.181.10.3129-3135.1999
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

ABSTRACT The general secretion pathway of gram-negative bacteria is responsible for extracellular secretion of a number of different proteins, including proteases and toxins. This pathway supports secretion of proteins across the cell envelope in two distinct steps, in which the second step, involving translocation through the outer membrane, is assisted by at least 13 different gene products. Two of these components, the cytoplasmic membrane proteins EpsL and EpsM of Vibrio cholerae , have been purified and characterized. Based on gel filtration analysis, both purified EpsM (His) 6 and wild-type EpsL present in an Escherichia coli Triton X-100 extract are dimeric proteins. EpsL and EpsM were also found to interact directly and form a Triton X-100 stable complex that could be precipitated with either anti-EpsL or anti-EpsM antibodies. In addition, when the L and M proteins were coexpressed in E. coli , they formed a stable complex and protected each other from proteolytic degradation, indicating that these two proteins interact in vivo and that no other Eps protein is required for their association. Since EpsL is predicted to contain a large cytoplasmic domain, while EpsM is predominantly exposed on the periplasmic side, we speculate that these components might be part of a structure that is involved in bridging the inner and outer membranes. Furthermore, since EpsL has previously been shown to interact with the autophosphorylating cytoplasmic membrane protein EpsE, we hypothesize that this trimolecular complex might be involved in regulating the opening and closing of the secretion pore and/or transducing energy to the site of outer membrane translocation.

Bibliography

Sandkvist, M., Hough, L. P., Bagdasarian, M. M., & Bagdasarian, M. (1999). Direct Interaction of the EpsL and EpsM Proteins of the General Secretion Apparatus in Vibrio cholerae. Journal of Bacteriology, 181(10), 3129–3135.

Authors 4
  1. Maria Sandkvist (first)
  2. Lloyd P. Hough (additional)
  3. Mira M. Bagdasarian (additional)
  4. Michael Bagdasarian (additional)
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Dates
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Created 5 years, 8 months ago (Dec. 31, 2019, 11:34 a.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 1:46 p.m.)
Indexed 1 month, 2 weeks ago (July 16, 2025, 9:26 a.m.)
Issued 26 years, 3 months ago (May 15, 1999)
Published 26 years, 3 months ago (May 15, 1999)
Published Print 26 years, 3 months ago (May 15, 1999)
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@article{Sandkvist_1999, title={Direct Interaction of the EpsL and EpsM Proteins of the General Secretion Apparatus in Vibrio cholerae}, volume={181}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.181.10.3129-3135.1999}, DOI={10.1128/jb.181.10.3129-3135.1999}, number={10}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Sandkvist, Maria and Hough, Lloyd P. and Bagdasarian, Mira M. and Bagdasarian, Michael}, year={1999}, month=may, pages={3129–3135} }