1z69

Crystal structure of methylenetetrahydromethanopterin reductase (Mer) in complex with coenzyme F420

spinqualitylabelsall models 1z69, resolution 2.61Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1z69 is a 4 chain structure with sequence from Methanosarcina barkeri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 1PG, CL, F42 Related: 1ezw, 1f07 Activity: 5,10-methylenetetrahydromethanopterin reductase, with EC number 1.5.99.11 Resources: FirstGlance, OCA, RCSB, PDBsum 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 Methylenetetratetrahydromethanopterin reductase (Mer) is involved in CO(2) reduction to methane in methanogenic archaea and catalyses the reversible reduction of methylenetetrahydromethanopterin (methylene-H(4)MPT) to methyl-H(4)MPT with coenzyme F(420)H(2), which is a reduced 5'-deazaflavin. Mer was recently established as a TIM barrel structure containing a nonprolyl cis-peptide bond but the binding site of the substrates remained elusive. We report here on the crystal structure of Mer in complex with F(420) at 2.6 A resolution. The isoalloxazine ring is present in a pronounced butterfly conformation, being induced from the Re-face of F(420) by a bulge that contains the non-prolyl cis-peptide bond. The bindingmode of F(420) is very similar to that in F(420)-dependent alcohol dehydrogenase Adf despite the low sequence identity of 21%. Moreover, binding of F(420) to the apoenzyme was only associated with minor conformational changes of the polypeptide chain. These findings allowed us to build an improved model of FMN into its binding site in bacterial luciferase, which belongs to the same structural family as Mer and Adf and also contains a nonprolyl cis-peptide bond in an equivalent position. Crystal structure of methylenetetrahydromethanopterin reductase (Mer) in complex with coenzyme F420: Architecture of the F420/FMN binding site of enzymes within the nonprolyl cis-peptide containing bacterial luciferase family.,Aufhammer SW, Warkentin E, Ermler U, Hagemeier CH, Thauer RK, Shima S Protein Sci. 2005 Jul;14(7):1840-9. Epub 2005 Jun 3. PMID:15937276 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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