3ujn | pdb_00003ujn

Formyl Glycinamide Ribonucleotide Amidotransferase from Salmonella Typhimurium : Role of the ATP complexation and glutaminase domain in catalytic coupling

spinqualitylabelsall models 3ujn, resolution 2.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ujn is a 1 chain structure with sequence from Salmonella enterica subsp. enterica serovar typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP, MG, SO4 NonStd Res: CYG Related: 1t3t Activity: Phosphoribosylformylglycinamidine synthase, with EC number 6.3.5.3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Formylglycinamide ribonucleotide (FGAR) amidotransferase (FGAR-AT) takes part in purine biosynthesis and is a multidomain enzyme with multiple spatially separated active sites. FGAR-AT contains a glutaminase domain that is responsible for the generation of ammonia from glutamine. Ammonia is then transferred via a channel to a second active site located in the synthetase domain and utilized to convert FGAR to formylglycinamidine ribonucleotide (FGAM) in an adenosine triphosphate (ATP) dependent reaction. In some ammonia-channelling enzymes ligand binding triggers interdomain signalling between the two diverse active centres and also assists in formation of the ammonia channel. Previously, the structure of FGAR-AT from Salmonella typhimurium containing a glutamyl thioester intermediate covalently bound in the glutaminase active site was determined. In this work, the roles played by various ligands of FGAR-AT in inducing catalytic coupling are investigated. Structures of FGAR-AT from S. typhimurium were determined in two different states: the unliganded form and the binary complex with an ATP analogue in the presence of the glutamyl thioester intermediate. The structures were compared in order to decipher the roles of these two states in interdomain communication. Using a process of elimination, the results indicated that binding of FGAR is most likely to be the major mechanism by which catalytic coupling occurs. This is because conformational changes do not occur either upon formation of the glutamyl thioester intermediate or upon subsequent ATP complexation. A model of the FGAR-bound form of the enzyme suggested that the loop in the synthetase domain may be responsible for initiating catalytic coupling via its interaction with the N-terminal domain. Formylglycinamide ribonucleotide amidotransferase from Salmonella typhimurium: role of ATP complexation and the glutaminase domain in catalytic coupling.,Tanwar AS, Morar M, Panjikar S, Anand R Acta Crystallogr D Biol Crystallogr. 2012 Jun;68(Pt 6):627-36. doi:, 10.1107/S0907444912006543. Epub 2012 May 17. PMID:22683785 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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