title: Purification, crystallization and preliminary X-ray analysis of the outer membrane complex HasA-HasR from Serratia marcescens.
abstract: Serratia marcescens is able to acquire iron using its haem-acquisition system (;has'), which contains an outer membrane receptor HasR and a soluble haemophore HasA. After secretion, HasA binds free haem in the extracellular medium or extracts it from haemoproteins and delivers it to the receptor. Here, the crystallization of a HasA-HasR complex is reported. HasA and HasR have been overexpressed in Escherichia coli and the complex formed and crystallized. Small platelets and bunches of needles of dimensions 0.01 x 0.1 x 1 mm were obtained. A native data set has been collected to 6.8 A.
authors.affiliation: Fachbereich Biologie, Universität Konstanz, 78457 Konstanz, Germany. huche@pasteur.fr
authors.forename: Frédéric
authors.initials: F
authors.lastname: Huché
authors.forename: Philippe
authors.initials: P
authors.lastname: Delepelaire
authors.forename: Cécile
authors.initials: C
authors.lastname: Wandersman
authors.forename: Wolfram
authors.initials: W
authors.lastname: Welte
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D002352:Carrier Proteins / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D003460:Crystallization; D018360:Crystallography, X-Ray; D006418:Heme / Q000737:chemistry* / Q000378:metabolism; D046911:Macromolecular Substances / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D008565:Membrane Proteins / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D008969:Molecular Sequence Data; D012705:Serratia / Q000737:chemistry* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; C093956:HasA protein, Serratia marcescens; D046911:Macromolecular Substances; D008565:Membrane Proteins; D006418:Heme