1mio

X-RAY CRYSTAL STRUCTURE OF THE NITROGENASE MOLYBDENUM-IRON PROTEIN FROM CLOSTRIDIUM PASTEURIANUM AT 3.0 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1mio, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mio is a 4 chain structure with sequence from Clostridium pasteurianum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3Å Ligands: CA, HCA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NIFD_CLOPA This molybdenum-iron protein is part of the nitrogenase complex that catalyzes the key enzymatic reactions in nitrogen fixation. 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 The crystal structure of the nitrogenase molybdenum-iron (MoFe) protein from Clostridium pasteurianum (Cp1) has been determined at 3.0-A resolution by a combination of isomorphous replacement, molecular replacement, and noncrystallographic symmetry averaging. The structure of Cp1, including the two types of metal centers associated with the protein (the FeMo-cofactor and the P-cluster pair), is similar to that previously described for the MoFe-protein from Azotobacter vinelandii (Av1). Unique features of the Cp1 structure arise from the presence of an approximately 50-residue insertion in the alpha subunit and an approximately 50-residue deletion in the beta subunit. As a consequence, the FeMo-cofactor is more buried in Cp1 than in Av1, since the insertion is located on the surface above the FeMo-cofactor. The location of this insertion near the putative nitrogenase iron protein binding site provides a structural basis for the observation that the nitrogenase proteins from C. pasteurianum have low activity with complementary nitrogenase proteins isolated from other organisms. Mechanistic implications of the Cp1 structure for substrate entry/product release, substrate binding to the FeMo-cofactor, and electron- and proton-transfer reactions of nitrogenase are discussed. X-ray crystal structure of the nitrogenase molybdenum-iron protein from Clostridium pasteurianum at 3.0-A resolution.,Kim J, Woo D, Rees DC Biochemistry. 1993 Jul 20;32(28):7104-15. PMID:8393705 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nitrogenase 3D structures

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