3ps9

Crystal structure of MnmC from E. coli

spinqualitylabelsall models 3ps9, resolution 2.54Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ps9 is a 1 chain structure with sequence from Escherichia coli bl21. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, FAD, SAM Gene: B21_02209, mnmC, yfcK (Escherichia coli BL21) Activity: tRNA (5-methylaminomethyl-2-thiouridylate)-methyltransferase, with EC number 2.1.1.61 Resources: FirstGlance, OCA, RCSB, PDBsum Function [C6ELC9_ECOBD] Catalyzes the last two steps in the biosynthesis of 5-methylaminomethyl-2-thiouridine (mnm(5)s(2)U) at the wobble position (U34) in tRNA. Catalyzes the FAD-dependent demodification of cmnm(5)s(2)U34 to nm(5)s(2)U34, followed by the transfer of a methyl group from S-adenosyl-L-methionine to nm(5)s(2)U34, to form mnm(5)s(2)U34 (By similarity).[SAAS:SAAS006076_004_060760][HAMAP-Rule:MF_01102] Publication Abstract from PubMed BACKGROUND: Methylaminomethyl modification of uridine or 2-thiouridine (mnm5U34 or mnm5s2U34) at the wobble position of tRNAs specific for glutamate, lysine and arginine are observed in Escherichia coli and allow for specific recognition of codons ending in A or G. In the biosynthetic pathway responsible for this post-transcriptional modification, the bifunctional enzyme MnmC catalyzes the conversion of its hypermodified substrate carboxymethylaminomethyl uridine (cmnm5U34) to mnm5U34. MnmC catalyzes the flavin adenine dinucleotide (FAD)-dependent oxidative cleavage of carboxymethyl group from cmnm5U34 via an imine intermediate to generate aminomethyl uridine (nm5U34), which is subsequently methylated by S-adenosyl-L-methionine (SAM) to yield methylaminomethyl uridine (mnm5U34). RESULTS: The X-ray crystal structures of SAM/FAD-bound bifunctional MnmC from Escherichia coli and Yersinia pestis, and FAD-bound bifunctional MnmC from Yersinia pestis were determined and the catalytic functions verified in an in vitro assay. CONCLUSION: The crystal structures of MnmC from two Gram negative bacteria reveal the overall architecture of the enzyme and the relative disposition of the two independent catalytic domains: a Rossmann-fold domain containing the SAM binding site and an FAD containing domain structurally homologous to glycine oxidase from Bacillus subtilis. The structures of MnmC also reveal the detailed atomic interactions at the interdomain interface and provide spatial restraints relevant to the overall catalytic mechanism. Structural basis for hypermodification of the wobble uridine in tRNA by bifunctional enzyme MnmC.,Kim J, Almo SC BMC Struct Biol. 2013 Apr 24;13:5. doi: 10.1186/1472-6807-13-5. PMID:23617613 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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