Association of Escherichia coli ribosomes with the inner membrane requires the signal recognition particle receptor but is independent of the signal recognition particle

Anat A. Herskovits, Eitan Bibi

Research output: Contribution to journalArticlepeer-review

Abstract

In mammalian cells, as well as Escherichia coli, ribosomes translating membrane proteins interact cotranslationally with translocons in the membrane, and this interaction is essential for proper insertion of nascent polypeptides into the membrane. Both the signal recognition particle (SRP) and its receptor (SR) are required for functional association of ribosomes translating integral membrane proteins with the translocon. Herein, we confirm that membrane targeting of E. coli ribosomes requires the prokaryotic SRα homolog FtsY in vivo. Surprisingly, however, depletion of the E. coli SRP54 homolog (Ffh) has no significant effect on binding of ribosomes to the membrane, although Ffh depletion is detrimental to growth. These and other observations suggest that, in E. coli, SRP may operate downstream of SR- mediated targeting of ribosomes to the plasma membrane.

Original languageEnglish
Pages (from-to)4621-4626
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number9
DOIs
StatePublished - 25 Apr 2000
Externally publishedYes

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