DOI: 10.1046/j.1365-2958.2003.03674.x. IcsA, a polarly localized autotransporter with an atypical signal peptide, uses the Sec apparatus for secretion, although the Sec apparatus is circumferentially distributed

IcsA, a polarly localized autotransporter with an atypical signal peptide, uses the Sec apparatus for secretion, although the Sec apparatus is circumferentially distributed

10.1046/j.1365-2958.2003.03674.x

Crossref journal-article

Wiley

Molecular Microbiology (311)

Abstract

SummaryAsymmetric localization of proteins is essential to many biological functions of bacteria. Shigella IcsA, an outer membrane protein, is localized to the old pole of the bacillus, where it mediates assembly of a polarized actin tail during infection of mammalian cells. Actin tail assembly provides the propulsive force for intracellular movement and intercellular dissemination. Localization of IcsA to the pole is independent of the amino‐terminal signal peptide (Charles, M., Perez, M., Kobil, J.H., and Goldberg, M.B., 2001, Proc Natl Acad Sci USA 98: 9871–9876) suggesting that IcsA targeting occurs in the bacterial cytoplasm and that its secretion across the cytoplasmic membrane occurs only at the pole. Here, we characterize the mechanism by which IcsA is secreted across the cytoplasmic membrane. We present evidence that IcsA requires the SecA ATPase and the SecYEG membrane channel (translocon) for secretion. Our data suggest that YidC is not required for IcsA secretion. Furthermore, we show that polar localization of IcsA is independent of SecA. Finally, we demonstrate that while IcsA requires the SecYEG translocon for secretion, components of this apparatus are uniformly distributed within the membrane. Based on these data, we propose a model for coordinate polar targeting and secretion of IcsA at the bacterial pole.

Bibliography

Brandon, L. D., Goehring, N., Janakiraman, A., Yan, A. W., Wu, T., Beckwith, J., & Goldberg, M. B. (2003). IcsA, a polarly localized autotransporter with an atypical signal peptide, uses the Sec apparatus for secretion, although the Sec apparatus is circumferentially distributed. Molecular Microbiology, 50(1), 45â60. Portico.

Authors 7

Lauren D. Brandon (first)
Nathan Goehring (additional)
Anuradha Janakiraman (additional)
Arthur W. Yan (additional)
Tong Wu (additional)
Jon Beckwith (additional)
Marcia B. Goldberg (additional)

References 69 Referenced 132

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Dates

Type	When
Created	21 years, 11 months ago (Sept. 19, 2003, 5:43 a.m.)
Deposited	1 year, 10 months ago (Oct. 14, 2023, 11:43 a.m.)
Indexed	1 month, 3 weeks ago (June 30, 2025, 12:42 p.m.)
Issued	22 years ago (Aug. 20, 2003)
Published	22 years ago (Aug. 20, 2003)
Published Online	22 years ago (Aug. 20, 2003)
Published Print	21 years, 10 months ago (Oct. 1, 2003)

Funders 0

None

BibTeX

@article{Brandon_2003, title={IcsA, a polarly localized autotransporter with an atypical signal peptide, uses the Sec apparatus for secretion, although the Sec apparatus is circumferentially distributed}, volume={50}, ISSN={1365-2958}, url={http://dx.doi.org/10.1046/j.1365-2958.2003.03674.x}, DOI={10.1046/j.1365-2958.2003.03674.x}, number={1}, journal={Molecular Microbiology}, publisher={Wiley}, author={Brandon, Lauren D. and Goehring, Nathan and Janakiraman, Anuradha and Yan, Arthur W. and Wu, Tong and Beckwith, Jon and Goldberg, Marcia B.}, year={2003}, month=aug, pages={45–60} }

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