1bi2

STRUCTURE OF APO-AND HOLO-DIPHTHERIA TOXIN REPRESSORSTRUCTURE OF APO-AND HOLO-DIPHTHERIA TOXIN REPRESSOR

Structural highlights 1bi2 is a 2 chain structure with sequence from "bacillus_diphtheriae"_kruse_in_flugge_1886 "bacillus diphtheriae" kruse in flugge 1886. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: DTXR ("Bacillus diphtheriae" Kruse in Flugge 1886) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [DTXR_CORDI] Iron-binding repressor of the dipheteria toxin gene expression. May serve as a global regulator of gene expression. Represses ripA under iron excess. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The diphtheria toxin repressor (DtxR) from Corynebacterium diphtheriae is a divalent metal-activated repressor of chromosomal genes that encode proteins responsible for siderophore-mediated iron uptake and also of the gene of certain corynebacteriophages that encodes diphtheria toxin. DtxR consists of two 25.3-kDa three-domain subunits and is a member of a family of related repressor proteins in several Gram-positive bacterial species, some of which are important human pathogens. In this paper, we report on the first high resolution crystal structures of apo-DtxR in two related space groups. In addition, crystal structures of Zn-DtxR were determined in the same two space groups. The resolutions of the structures range from 2.2 to 2.4 A. The four refined models of the apo- and the holo-repressor exhibit quite similar metal binding centers, which do, however, show higher thermal motion in the apo-structures. All four structures reported differ from each other in one important aspect. The N-terminal DNA-binding domain and the last 20 residues of the dimerization domain of each subunit move significantly with respect to the core of the DtxR dimer, which consists of residues 74-120 from both subunits. These results provide the first indication of a conformational change that may occur upon binding of the holo-repressor to DNA. Motion of the DNA-binding domain with respect to the core of the diphtheria toxin repressor (DtxR) revealed in the crystal structures of apo- and holo-DtxR.,Pohl E, Holmes RK, Hol WG J Biol Chem. 1998 Aug 28;273(35):22420-7. PMID:9712865 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Diphtheria toxin repressor

spinqualitylabelsall models 1bi2, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image