6q2e | pdb_00006q2e

Crystal structure of Methanobrevibacter smithii Dph2 bound to 5'-methylthioadenosine

spinqualitylabelsall models 6q2e, resolution 1.77Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6q2e is a 2 chain structure with sequence from Methanobrevibacter smithii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.768Å Ligands: CL, MTA, SF4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A5UMY5_METS3 Catalyzes the first step of diphthamide biosynthesis, i.e. the transfer of the 3-amino-3-carboxypropyl group from S-adenosyl-L-methionine (SAM) to the C2 position of the imidazole ring of the target histidine residue in translation elongation factor 2 (EF-2).[PIRNR:PIRNR004967] Publication Abstract from PubMed Elongation factor 2 (EF-2), a five-domain, GTP-dependent ribosomal translocase of archaebacteria and eukaryotes, undergoes post-translational modification to form diphthamide on a specific histidine residue in domain IV prior to binding the ribosome. The first step of diphthamide biosynthesis in archaebacteria is catalyzed by Dph2, a homodimeric radical S-adenosylmethionine (SAM) enzyme having a noncanonical architecture. Here, we describe a 3.5 A resolution crystal structure of the Methanobrevibacter smithii (Ms) Dph2 homodimer bound to two molecules of MsEF-2, one of which is ordered and the other largely disordered. MsEF-2 is bound to both protomers of MsDph2, with domain IV bound to the active site of one protomer and domain III bound to a surface alpha-helix of an adjacent protomer. The histidine substrate of domain IV is inserted into the active site, which reveals for the first time the architecture of the Dph2 active site in complex with its target substrate. We also determined a high-resolution crystal structure of isolated MsDph2 bound to 5'-methylthioadenosine that shows a conserved arginine residue preoriented by conserved phenylalanine and aspartate residues for binding the carboxylate group of SAM. Mutagenesis experiments suggest that the arginine plays an important role in the first step of diphthamide biosynthesis. The Crystal Structure of Dph2 in Complex with Elongation Factor 2 Reveals the Structural Basis for the First Step of Diphthamide Biosynthesis.,Fenwick MK, Dong M, Lin H, Ealick SE Biochemistry. 2019 Oct 14. doi: 10.1021/acs.biochem.9b00718. PMID:31566354 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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