title: Structure of Bacillus subtilis YXKO--a member of the UPF0031 family and a putative kinase.
abstract: We determined the 1.6-A resolution crystal structure of a conserved hypothetical 29.9-kDa protein from the SIGY-CYDD intergenic region encoded by a Bacillus subtilis open reading frame in the YXKO locus. YXKO homologues are broadly distributed and are by and large described as proteins with unknown function. The YXKO protein has an alpha/beta fold and shows high structural homology to the members of a ribokinase-like superfamily. However, YXKO is the only member of this superfamily known to form tetramers. Putative binding sites for adenosine triphosphate (ATP), a substrate, and Mg(2+)-binding sites were revealed in the structure of the protein, based on high structural similarity to ATP-dependent members of the superfamily. Two adjacent monomers contribute residues to the active site. The crystal structure provides valuable information about the YXKO protein's tertiary and quaternary structure, the biochemical function of YXKO and its homologues, and the evolution of its ribokinase-like superfamily.
authors.affiliation: Biosciences Division, Structural Biology Center, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: R-g
authors.initials: RG
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Grembecka
authors.forename: E
authors.initials: E
authors.lastname: Vinokour
authors.forename: F
authors.initials: F
authors.lastname: Collart
authors.forename: I
authors.initials: I
authors.lastname: Dementieva
authors.forename: W
authors.initials: W
authors.lastname: Minor
authors.forename: A
authors.initials: A
authors.lastname: Joachimiak
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D001412:Bacillus subtilis / Q000201:enzymology*; D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D003001:Cloning, Molecular; D018360:Crystallography, X-Ray; D019143:Evolution, Molecular; D006801:Humans; D008670:Metals / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D008970:Molecular Weight; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation; D017386:Sequence Homology, Amino Acid; D013329:Structure-Activity Relationship
chemical_list: D001426:Bacterial Proteins; D008670:Metals; D000255:Adenosine Triphosphate; D017853:Phosphotransferases (Alcohol Group Acceptor); C022534:ribokinase