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Publication Abstract from PubMed

Glycinamide ribonucleotide synthetase (GAR-syn, PurD) catalyses the second reaction of the purine biosynthetic pathway; the conversion of phosphoribosylamine, glycine and ATP to glycinamide ribonucleotide (GAR), ADP and Pi. In the present study, crystal structures of GAR-syn's from Thermus thermophilus, Geobacillus kaustophilus and Aquifex aeolicus were determined in apo forms. Crystal structures in ligand-bound forms were also determined for G. kaustophilus and A. aeolicus proteins. In general, overall structures of GAR-syn's are similar to each other. However, the orientations of the B domains are varied among GAR-syn's and the MD simulation suggested the mobility of the B domain. Furthermore, it was demonstrated that the B loop in the B domain fixes the position of the beta- and gamma- phosphate groups of the bound ATP. The structures of GAR-syn's and the bound ligands were compared with each other in detail, and structures of GAR-syn's with full ligands, as well as the possible reaction mechanism, were proposed.

Crystal structures of glycinamide ribonucleotide synthetase, PurD, from thermophilic eubacteria.,Sampei G, Baba S, Kanagawa M, Yanai H, Ishii T, Kawai H, Fukai Y, Ebihara A, Nakagawa N, Kawai G J Biochem. 2010 Oct;148(4):429-38. Epub 2010 Aug 16. PMID:20716513^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.