3iqf | pdb_00003iqf

Structure of F420 dependent methylene-tetrahydromethanopterin dehydrogenase in complex with methenyl-tetrahydromethanopterin

spinqualitylabelsall models 3iqf, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3iqf is a 12 chain structure with sequence from Methanopyrus kandleri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: CA, E4M, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MTD_METKA Catalyzes the reversible reduction of methenyl-H(4)MPT(+) to methylene-H(4)MPT. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed F(420)-dependent methylenetetrahydromethanopterin (methylene-H(4)MPT) dehydrogenase (Mtd) of Methanopyrus kandleri is an enzyme of the methanogenic energy metabolism that catalyzes the reversible hydride transfer between methenyl-H(4)MPT(+) and methylene-H(4)MPT using coenzyme F(420) as hydride carrier. We determined the structures of the Mtd-methylene-H(4)MPT, Mtd-methenyl-H(4)MPT(+), and the Mtd-methenyl-H(4)MPT(+)-F(420)H(2) complexes at 2.1, 2.0, and 1.8 A resolution, respectively. The pterin-imidazolidine-phenyl ring system is present in a new extended but not planar conformation which is virtually identical in methenyl-H(4)MPT(+) and methylene-H(4)MPT at the current resolution. Both substrates methenyl-H(4)MPT(+) and F(420)H(2) bind in a face to face arrangement to an active site cleft, thereby ensuring a direct hydride transfer between their C14a and C5 atoms, respectively. The polypeptide scaffold does not reveal any significant conformational change upon binding of the bulky substrates but in turn changes the conformations of the substrate rings either to avoid clashes between certain ring atoms or to adjust the rings involved in hydride transfer for providing an optimal catalytic efficiency. Structural Basis of the Hydride Transfer Mechanism in F(420)-Dependent Methylenetetrahydromethanopterin Dehydrogenase.,Ceh K, Demmer U, Warkentin E, Moll J, Thauer RK, Shima S, Ermler U Biochemistry. 2009 Sep 29. PMID:19761261 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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