5ae0 | pdb_00005ae0

Perdeuterated mouse CNPase catalytic domain at atomic resolution

spinqualitylabelsall models 5ae0, resolution 1.04Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ae0 is a 1 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CIT, CL Activity: 2',3'-cyclic-nucleotide 3'-phosphodiesterase, with EC number 3.1.4.37 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CN37_MOUSE] May participate in RNA metabolism in the myelinating cell, CNP is the third most abundant protein in central nervous system myelin. Publication Abstract from PubMed 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNPase) is an enzyme highly abundant in the central nervous system myelin of terrestrial vertebrates. The catalytic domain of CNPase belongs to the 2H phosphoesterase superfamily and catalyzes the hydrolysis of nucleoside 2',3'-cyclic monophosphates to nucleoside 2'-monophosphates. The detailed reaction mechanism and the essential catalytic amino acids involved have been described earlier, but the roles of many amino acids in the vicinity of the active site have remained unknown. Here, several CNPase catalytic domain mutants were studied using enzyme kinetics assays, thermal stability experiments, and X-ray crystallography. Additionally, the crystal structure of a perdeuterated CNPase catalytic domain was refined at atomic resolution to obtain a detailed view of the active site and the catalytic mechanism. The results specify determinants of ligand binding and novel essential residues required for CNPase catalysis. For example, the aromatic side chains of Phe235 and Tyr168 are crucial for substrate binding, and Arg307 may affect active site electrostatics and regulate loop dynamics. The beta5-alpha7 loop, unique for CNPase in the 2H phosphoesterase family, appears to have various functions in the CNPase reaction mechanism, from coordinating the nucleophilic water molecule to providing a binding pocket for the product and being involved in product release. Determinants of ligand binding and catalytic activity in the myelin enzyme 2',3'-cyclic nucleotide 3'-phosphodiesterase.,Raasakka A, Myllykoski M, Laulumaa S, Lehtimaki M, Hartlein M, Moulin M, Kursula I, Kursula P Sci Rep. 2015 Nov 13;5:16520. doi: 10.1038/srep16520. PMID:26563764 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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