title: Polypeptide binding of Escherichia coli FtsH (HflB).
abstract: The Escherichia coli FtsH protein is a membrane-bound and ATP-dependent protease. In this study, we describe ATP-dependent conformational changes in FtsH as well as a polypeptide binding ability of this protein. A 33 kDa segment of FtsH became trypsin resistant in the presence of ATP. ATP and ATPgammaS prevented self-aggregation of detergent-solubilized FtsH-His6-Myc at 37 degrees C, again suggesting that the binding of ATP induces a conformational change in FtsH. Affinity chromatography showed that FtsH-His6-Myc can associate with denatured alkaline phosphatase (PhoA) but not with the native enzyme. Denatured PhoA also prevented the aggregation of FtsH, and these two proteins co-sedimented through a sucrose gradient. Binding between FtsH-His6-Myc and detergent-solubilized SecY was also demonstrated. Although FtsH-bound SecY was processed further for ATP-dependent proteolysis, FtsH-bound PhoA was not. Thus, FtsH association with denatured PhoA is uncoupled from proteolysis. Overproduction of FtsH significantly increased the cytoplasmic localization of the PhoA moiety of a MalF-PhoA hybrid protein, in which a charged residue had been introduced into a transmembrane segment. Thus, denatured PhoA binding of FtsH may also occur in vivo.
authors.affiliation: Department of Cell Biology, Institute for Virus Research, Kyoto University, Japan. yakiyama@virus.kyoto-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Akiyama
authors.forename: M
authors.initials: M
authors.lastname: Ehrmann
authors.forename: A
authors.initials: A
authors.lastname: Kihara
authors.forename: K
authors.initials: K
authors.lastname: Ito
mesh_terms: D018528:ATP-Binding Cassette Transporters; D049069:ATP-Dependent Proteases; D000251:Adenosine Triphosphatases; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives / Q000494:pharmacology; D000469:Alkaline Phosphatase / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins; D016259:Genes, myc; D006639:Histidine; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins; D010455:Peptides / Q000378:metabolism*; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D000069816:SEC Translocation Channels
chemical_list: D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D058619:Maltose-Binding Proteins; D008565:Membrane Proteins; D009004:Monosaccharide Transport Proteins; D010455:Peptides; D011993:Recombinant Fusion Proteins; D000069816:SEC Translocation Channels; C057841:SecY protein, E coli; C461599:maltose transport system, E coli; C022571:adenosine 5'-O-(3-thiotriphosphate); D006639:Histidine; D000255:Adenosine Triphosphate; D000469:Alkaline Phosphatase; D049069:ATP-Dependent Proteases; C513383:FtsH protein, E coli; D000251:Adenosine Triphosphatases