PMID:11777926

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Citation

Koch, HG, Moser, M, Schimz, KL and Muller, M (2002) The integration of YidC into the cytoplasmic membrane of Escherichia coli requires the signal recognition particle, SecA and SecYEG. J. Biol. Chem. 277:5715-8

Abstract

The integration of the polytopic membrane protein YidC into the inner membrane of Escherichia coli was analyzed employing an in vitro system. Upon integration of in vitro synthesized YidC, a 42-kDa membrane protected fragment was detected, which could be immunoprecipitated with polyclonal anti-YidC antibodies. The occurrence of this fragment is in agreement with the predicted topology of YidC and probably encompasses the first two transmembrane domains and the connecting 320-amino acid-long periplasmic loop. The integration of YidC was strictly dependent on the signal recognition particle and SecA. YidC could not be integrated in the absence of SecY, SecE, or SecG, suggesting that YidC, in contrast to its mitochondrial orthologue Oxa1p, cannot engage a SecYEG-independent protein-conducting channel.

Links

PubMed Online version:10.1074/jbc.C100683200

Keywords

Adenosine Triphosphatases/metabolism; Bacterial Proteins/chemistry; Bacterial Proteins/isolation & purification; Bacterial Proteins/metabolism; Cell Membrane/metabolism; Cell Membrane/ultrastructure; Escherichia coli/metabolism; Escherichia coli Proteins; Membrane Proteins/metabolism; Membrane Transport Proteins/metabolism; Models, Molecular; Protein Conformation; Signal Recognition Particle/metabolism

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