title: Crystal structure of Bacillus subtilis YabJ, a purine regulatory protein and member of the highly conserved YjgF family.
abstract: The yabJ gene in Bacillus subtilis is required for adenine-mediated repression of purine biosynthetic genes in vivo and codes for an acid-soluble, 14-kDa protein. The molecular mechanism of YabJ is unknown. YabJ is a member of a large, widely distributed family of proteins of unknown biochemical function. The 1.7-A crystal structure of YabJ reveals a trimeric organization with extensive buried hydrophobic surface and an internal water-filled cavity. The most important finding in the structure is a deep, narrow cleft between subunits lined with nine side chains that are invariant among the 25 most similar homologs. This conserved site is proposed to be a binding or catalytic site for a ligand or substrate that is common to YabJ and other members of the YER057c/YjgF/UK114 family of proteins.
authors.affiliation: Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: S
authors.initials: S
authors.lastname: Sinha
authors.forename: P
authors.initials: P
authors.lastname: Rappu
authors.forename: S C
authors.initials: SC
authors.lastname: Lange
authors.forename: P
authors.initials: P
authors.lastname: Mäntsälä
authors.forename: H
authors.initials: H
authors.lastname: Zalkin
authors.forename: J L
authors.initials: JL
authors.lastname: Smith
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001412:Bacillus subtilis / Q000737:chemistry* / Q000235:genetics; D001426:Bacterial Proteins / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009876:Operon; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; C400758:YabJ protein, Bacillus subtilis