5n0o | pdb_00005n0o

Crystal structure of Seleno-OphA-DeltaC18 in complex with SAM

spinqualitylabelsall models 5n0o, resolution 1.44Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5n0o is a 2 chain structure with sequence from Omphalotus olearius. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.44Å Ligands: CSO, CSX, EDO, HSE, MSE, SAM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A2R2JFH7_OMPOL Publication Abstract from PubMed The peptide bond, the defining feature of proteins, governs peptide chemistry by abolishing nucleophilicity of the nitrogen. This and the planarity of the peptide bond arise from the delocalization of the lone pair of electrons on the nitrogen atom into the adjacent carbonyl. While chemical methylation of an amide bond uses a strong base to generate the imidate, OphA, the precursor protein of the fungal peptide macrocycle omphalotin A, self-hypermethylates amides at pH 7 using S-adenosyl methionine (SAM) as cofactor. The structure of OphA reveals a complex catenane-like arrangement in which the peptide substrate is clamped with its amide nitrogen aligned for nucleophilic attack on the methyl group of SAM. Biochemical data and computational modeling suggest a base-catalyzed reaction with the protein stabilizing the reaction intermediate. Backbone N-methylation of peptides enhances their protease resistance and membrane permeability, a property that holds promise for applications to medicinal chemistry. A molecular mechanism for the enzymatic methylation of nitrogen atoms within peptide bonds.,Song H, van der Velden NS, Shiran SL, Bleiziffer P, Zach C, Sieber R, Imani AS, Krausbeck F, Aebi M, Freeman MF, Riniker S, Kunzler M, Naismith JH Sci Adv. 2018 Aug 24;4(8):eaat2720. doi: 10.1126/sciadv.aat2720. eCollection 2018, Aug. PMID:30151425 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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