Genetic screen yields mutations in genes encoding all known components of the Escherichia coli signal recognition particle pathway.

Abstract:

:We describe the further utilization of a genetic screen that identifies mutations defective in the assembly of proteins into the Escherichia coli cytoplasmic membrane. The screen yielded mutations in each of the known genes encoding components of the E. coli signal recognition particle pathway: ffh, ffs, and ftsY, which encode Ffh, 4.5S RNA, and FtsY, respectively. In addition, the screen yielded mutations in secM, which is involved in regulating levels of the SecA component of the bacterium's protein export pathway. We used a sensitive assay involving biotinylation to show that all of the mutations caused defects in the membrane insertions of three topologically distinct membrane proteins, AcrB, MalF, and FtsQ. Among the mutations that resulted in membrane protein insertion defects, only the secM mutations also showed defects in the translocation of proteins into the E. coli periplasm. Genetic evidence suggests that the S382T alteration of Ffh affects the interaction between Ffh and 4.5S RNA.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Tian H,Beckwith J

doi

10.1128/jb.184.1.111-118.2002

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

111-8

issue

1

eissn

0021-9193

issn

1098-5530

journal_volume

184

pub_type

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