title: The integration of YidC into the cytoplasmic membrane of Escherichia coli requires the signal recognition particle, SecA and SecYEG.
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.
authors.affiliation: Institute for Biochemistry and Molecular Biology, University Freiburg, Hermann-Herder-Strasse 7, D-79104 Freiburg, Germany.Hans-Georg.Koch@biochemie.uni-freiburg.de
authors.forename: Hans-Georg
authors.initials: HG
authors.lastname: Koch
authors.forename: Michael
authors.initials: M
authors.lastname: Moser
authors.forename: Karl-Ludwig
authors.initials: KL
authors.lastname: Schimz
authors.forename: Matthias
authors.initials: M
authors.lastname: Muller
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism / Q000648:ultrastructure; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins; D008565:Membrane Proteins / Q000378:metabolism; D026901:Membrane Transport Proteins / Q000378:metabolism*; D008958:Models, Molecular; D011487:Protein Conformation; D000069816:SEC Translocation Channels; D000081416:SecA Proteins; D018271:Signal Recognition Particle / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D000069816:SEC Translocation Channels; C489583:SecF protein, E coli; C088616:SecG protein, E coli; C057841:SecY protein, E coli; D018271:Signal Recognition Particle; C412443:YIDC protein, E coli; C075768:secF protein, Bacteria; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins