title: Saccharomyces cerevisiae Cox18 complements the essential Sec-independent function of Escherichia coli YidC.
abstract: Members of the YidC/Oxa1/Alb3 protein family function in the biogenesis of membrane proteins in bacteria, mitochondria and chloroplasts. In Escherichia coli, YidC plays a key role in the integration and assembly of many inner membrane proteins. Interestingly, YidC functions both in concert with the Sec-translocon and as a separate insertase independent of the translocon. Mitochondria of higher eukaryotes contain two distant homologues of YidC: Oxa1 and Cox18/Oxa2. Oxa1 is required for the insertion of membrane proteins into the mitochondrial inner membrane. Cox18/Oxa2 plays a poorly defined role in the biogenesis of the cytochrome c oxidase complex. Employing a genetic complementation approach by expressing the conserved region of yeast Cox18 in E. coli, we show here that Cox18 is able to complement the essential Sec-independent function of YidC. This identifies Cox18 as a bona fide member of the YidC/Oxa1/Alb3 family.
authors.affiliation: Department of Molecular Microbiology, Institute of Molecular Cell Biology, Vrije Universiteit, Amsterdam, The Netherlands.
authors.forename: Edwin
authors.initials: E
authors.lastname: van Bloois
authors.forename: Gregory
authors.initials: G
authors.lastname: Koningstein
authors.forename: Heike
authors.initials: H
authors.lastname: Bauerschmitt
authors.forename: Johannes M
authors.initials: JM
authors.lastname: Herrmann
authors.forename: Joen
authors.initials: J
authors.lastname: Luirink
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D003576:Electron Transport Complex IV / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism*; D005816:Genetic Complementation Test; D008565:Membrane Proteins / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000378:metabolism*; D024101:Mitochondrial Proteins / Q000378:metabolism; D008954:Models, Biological; D009687:Nuclear Proteins / Q000378:metabolism; D000069816:SEC Translocation Channels; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D000081416:SecA Proteins
chemical_list: D001426:Bacterial Proteins; C409465:COX18 protein, S cerevisiae; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D024101:Mitochondrial Proteins; D009687:Nuclear Proteins; C090858:OXA1 protein; D000069816:SEC Translocation Channels; D029701:Saccharomyces cerevisiae Proteins; C412443:YIDC protein, E coli; D003576:Electron Transport Complex IV; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins