Presence of multiple sites containing polar material in spherical Escherichia coli cells that lack MreB.

Abstract:

:In rod-shaped bacteria, certain proteins are specifically localized to the cell poles. The nature of the positional information that leads to the proper localization of these proteins is unclear. In a screen for factors required for the localization of the Shigella sp. actin assembly protein IcsA to the bacterial pole, a mutant carrying a transposon insertion in mreB displayed altered targeting of IcsA. The phenotype of cells containing a transposon insertion in mreB was indistinguishable from that of cells containing a nonpolar mutation in mreB or that of wild-type cells treated with the MreB inhibitor A22. In cells lacking MreB, a green fluorescent protein (GFP) fusion to a cytoplasmic derivative of IcsA localized to multiple sites. Secreted full-length native IcsA was present in multiple faint patches on the surfaces of these cells in a pattern similar to that seen for the cytoplasmic IcsA-GFP fusion. EpsM, the polar Vibrio cholerae inner membrane protein, also localized to multiple sites in mreB cells and colocalized with IcsA, indicating that localization to multiple sites is not unique to IcsA. Our results are consistent with the requirement, either direct or indirect, for MreB in the restriction of certain polar material to defined sites within the cell and, in the absence of MreB, with the formation of ectopic sites containing polar material.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Nilsen T,Yan AW,Gale G,Goldberg MB

doi

10.1128/JB.187.17.6187-6196.2005

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

6187-96

issue

17

eissn

0021-9193

issn

1098-5530

pii

187/17/6187

journal_volume

187

pub_type

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