title: Function of YidC for the insertion of M13 procoat protein in Escherichia coli: translocation of mutants that show differences in their membrane potential dependence and Sec requirement.
abstract: The membrane insertion of the Sec-independent M13 Procoat protein in bacteria requires the membrane electrochemical potential and the integral membrane protein YidC. We show here that YidC is involved in the translocation but not in the targeting of the Procoat protein, because we found the protein was partitioned into the membrane in the absence of YidC. YidC can function also to promote membrane insertion of Procoat mutants that insert independently of the membrane potential, proving that the effect of YidC depletion is not due to a dissipation of the membrane potential. We also found that YidC is absolutely required for Sec-dependent translocation of a long periplasmic loop of a mutant Procoat in which the periplasmic region has been extended from 20 to 194 residues. Furthermore, when Sec-dependent membrane proteins with large periplasmic domains were overproduced under YidC-limited conditions, we found that the exported proteins pro-OmpA and pre-peptidoglycan-associated lipoprotein accumulated in the cytoplasm. This suggests for Sec-dependent proteins that YidC functions at a late stage in membrane insertion, after the Sec translocase interacts with the translocating membrane protein. These studies are consistent with the understanding that YidC cooperates with the Sec translocase for membrane translocation and that YidC is required for clearing the protein-conducting channel.
authors.affiliation: Department of Chemistry, Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Samuelson
authors.forename: F
authors.initials: F
authors.lastname: Jiang
authors.forename: L
authors.initials: L
authors.lastname: Yi
authors.forename: M
authors.initials: M
authors.lastname: Chen
authors.forename: J W
authors.initials: JW
authors.lastname: de Gier
authors.forename: A
authors.initials: A
authors.lastname: Kuhn
authors.forename: R E
authors.initials: RE
authors.lastname: Dalbey
mesh_terms: D000251:Adenosine Triphosphatases / Q000502:physiology*; D001426:Bacterial Proteins / Q000502:physiology*; D001692:Biological Transport; D002213:Capsid / Q000378:metabolism*; D036022:Capsid Proteins; D002352:Carrier Proteins / Q000502:physiology*; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins; D008564:Membrane Potentials; D026901:Membrane Transport Proteins; D011498:Protein Precursors / Q000378:metabolism*; D000069816:SEC Translocation Channels; D000081416:SecA Proteins
chemical_list: D001426:Bacterial Proteins; D036022:Capsid Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D026901:Membrane Transport Proteins; D011498:Protein Precursors; D000069816:SEC Translocation Channels; C412443:YIDC protein, E coli; C025668:coat protein, Bacteriophage M13; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins