title: Functional overexpression and in vitro re-association of OpuA, an osmotically regulated ABC-transport complex from Bacillus subtilis.
abstract: The osmotically regulated OpuA uptake system from Bacillus subtilis is a member of the SBP-dependent subfamily of ABC-transporters. The functional complex, OpuA(A(2)B(2)C), catalyzes the osmotically controlled import of the compatible solutes glycine betaine and proline betaine. Here, we describe the purification of the isolated TMS, OpuAB. Stimulated ATPase activity of OpuAA by OpuAB demonstrated that OpuAB adopts a functional fold. An interaction between all subunits could be verified in detergent solution with the highest ATPase stimulation determined for the dimeric NBS in the re-associated complex in the presence of all transport components plus substrate.
authors.affiliation: Institute of Biochemistry, Heinrich Heine University Duesseldorf, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Horn
authors.forename: Erhard
authors.initials: E
authors.lastname: Bremer
authors.forename: Lutz
authors.initials: L
authors.lastname: Schmitt
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D000251:Adenosine Triphosphatases / Q000378:metabolism; D001412:Bacillus subtilis / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D017510:Protein Folding; D021122:Protein Subunits / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D018528:ATP-Binding Cassette Transporters; D001426:Bacterial Proteins; D021122:Protein Subunits; D000251:Adenosine Triphosphatases