Ecm10, a novel hsp70 homolog in the mitochondrial matrix of the yeast Saccharomyces cerevisiae.
Members of the heat shock protein 70 (Hsp70) family are found in most of the compartments of eukaryotic cells where they play essential roles in protein metabolism. In yeast mitochondria, two Hsp70 proteins are known: Ssc1 and Ssq1. We identified Ecm10 as a third Hsp70 protein in the mitochondrial matrix. Ecm10 shares 82% amino acid identity with Ssc1 and 54% with Ssq1. Overexpression of Ecm10 mitigates protein import defects in ssc1 mutants suggesting that Ecm10 can play a role in protein translocation. Like Ssc1, Ecm10 interacts with the nucleotide exchange factor Mge1 in an ATP-dependent manner. Deletion of ecm10 leads to synthetic growth defects with ssc1 mutations at low temperature. Our data suggest an overlapping function of Ecm10 and Ssc1.
Baumann
F
F
Institut für Physiologische Chemie, Goethestr. 33, 80336, Munich, Germany.
Milisav
I
I
Neupert
W
W
Herrmann
J M
JM
D000595:Amino Acid Sequence; D002352:Carrier Proteins / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D005656:Fungal Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D006360:Heat-Shock Proteins; D026901:Membrane Transport Proteins; D008928:Mitochondria / Q000378:metabolism*; D033681:Mitochondrial Membrane Transport Proteins; D018832:Molecular Chaperones; D008969:Molecular Sequence Data; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D002352:Carrier Proteins; C419585:ECM10 protein, S cerevisiae; D029968:Escherichia coli Proteins; D005656:Fungal Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C086039:MGE1 protein, S cerevisiae; D026901:Membrane Transport Proteins; D033681:Mitochondrial Membrane Transport Proteins; D018832:Molecular Chaperones; D029701:Saccharomyces cerevisiae Proteins; C063842:dnaK protein, E coli