4fx8 | pdb_00004fx8

Crystal structure of the mutant Q185A.R203A of orotidine 5'-monophosphate decarboxylase from Methanobacterium thermoautotrophicum complexed with inhibitor BMP

spinqualitylabelsall models 4fx8, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4fx8 is a 2 chain structure with sequence from Metth. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BMP, SO4 Related: 3ltp, 4fx6, 4fxr Gene: pyrF, MTH_129 (METTH) Activity: Orotidine-5'-phosphate decarboxylase, with EC number 4.1.1.23 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PYRF_METTH] Catalyzes the decarboxylation of orotidine 5'-monophosphate (OMP) to uridine 5'-monophosphate (UMP).[HAMAP-Rule:MF_01200_A] Publication Abstract from PubMed The binding of a ligand to orotidine 5'-monophosphate decarboxylase (OMPDC) is accompanied by a conformational change from an open, inactive conformation (E(o)) to a closed, active conformation (E(c)). As the substrate traverses the reaction coordinate to form the stabilized vinyl carbanion/carbene intermediate, interactions that destabilize the carboxylate group of the substrate and stabilize the intermediate (in the E(c).S() complex) are enforced. Focusing on the OMPDC from Methanothermobacter thermautotrophicus, we find the "remote" 5'-phosphate group of the substrate activates the enzyme 2.4 x 10(8)-fold; the activation is equivalently described by an intrinsic binding energy (IBE) of 11.4 kcal/mol. We studied residues in the activation that (1) directly contact the 5'-phosphate group, (2) participate in a hydrophobic cluster near the base of the active site loop that sequesters the bound substrate from the solvent, and (3) form hydrogen bonding interactions across the interface between the "mobile" and "fixed" half-barrel domains of the (beta/alpha)(8)-barrel structure. Our data support a model in which the IBE provided by the 5'-phosphate group is used to allow interactions both near the N-terminus of the active site loop and across the domain interface that stabilize both the E(c).S and E(c).S() complexes relative to the E(o).S complex. The conclusion that the IBE of the 5'-phosphate group provides stabilization to both the E(c).S and E(c).S() complexes, not just the E(c).S() complex, is central to understanding the structural origins of enzymatic catalysis as well as the requirements for the de novo design of enzymes that catalyze novel reactions. Conformational Changes in Orotidine 5'-Monophosphate Decarboxylase: A Structure-Based Explanation for How the 5'-Phosphate Group Activates the Enzyme.,Desai BJ, Wood BM, Fedorov AA, Fedorov EV, Goryanova B, Amyes TL, Richard JP, Almo SC, Gerlt JA Biochemistry. 2012 Oct 17. PMID:23030629 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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