title: Crystal structure of PduO-Type ATP:Cob(I)alamin adenosyltransferase from Bacillus cereus in a complex with ATP.
abstract: ATP:Cobalamin adenosyltransferases catalyze the transfer a 5'-deoxyadenosyl moiety from ATP to cob(I)alamin in the synthesis of the Co-C bond of coenzyme B(12). There are three types of adenosyltransferases, CobA, PduO and EutT. Among these adenosyltransferases, the PduO-type adenosyltransferases is the most widely distributed enzyme. Structural comparisons between apo BcPduO and BcPduO in complex with MgATP revealed that the N-terminal strands of both structures were ordered, which is in contrast with the most previously available PduO-type adenosyltransferase structures. Furthermore, unlike other reported structures, apo BcPduO was bound to additional dioxane molecules causing a side chain conformational change at the Tyr30 residue, which is an important residue that mediates hydrogen bonding with ATP molecules upon binding of cobalamin to the active site. This study provides more structural information into the role of active site residues on substrate binding.
authors.affiliation: Division of Biotechnology, College of Life Sciences, Korea University, Seoul 136-713, Republic of Korea.
authors.forename: Ae Kyung
authors.initials: AK
authors.lastname: Park
authors.forename: Young Min
authors.initials: YM
authors.lastname: Chi
authors.forename: Jin Ho
authors.initials: JH
authors.lastname: Moon
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry*; D019883:Alkyl and Aryl Transferases / Q000737:chemistry* / Q000235:genetics; D000595:Amino Acid Sequence; D001409:Bacillus cereus / Q000201:enzymology*; D001665:Binding Sites; D018360:Crystallography, X-Ray; D008969:Molecular Sequence Data; D055503:Protein Multimerization; D017433:Protein Structure, Secondary; D014443:Tyrosine / Q000737:chemistry / Q000235:genetics
chemical_list: D014443:Tyrosine; D000255:Adenosine Triphosphate; D019883:Alkyl and Aryl Transferases; C019920:cob(I)alamin adenosyltransferase