1xcp

Crystal Structure of the Nitrogenase Fe protein Phe135Trp with MgADP bound

spinqualitylabelsall models 1xcp, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xcp is a 4 chain structure with sequence from Azotobacter vinelandii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.2Å Ligands: ADP, MG, SF4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NIFH1_AZOVI The key enzymatic reactions in nitrogen fixation are catalyzed by the nitrogenase complex, which has 2 components: the iron protein (component 2) and a component 1 which is either a molybdenum-iron protein, a vanadium-iron, or an iron-iron protein.[HAMAP-Rule:MF_00533] 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 Azotobacter vinelandii nitrogenase Fe protein with phenylalanine at position 135 substituted by tryptophan has been determined in MgADP-bound form by X-ray diffraction methods. Amino acid substitution studies have suggested that the phenylalanine at position 135 located near the [4Fe-4S] cluster contributes to both the midpoint potential and nucleotide-induced changes of the [4Fe-4S] cluster. Substitution of tryptophan for phenylalanine at position 135 resulted in a significant positive shift in the midpoint potential in both the isolated and nucleotide-bound states. The factors thought to control the midpoint potential of the [FeS] cluster include solvent accessibility, dipolar environment, and structural strain. The structure derived in the present work provides an explanation for the more positive midpoint potential observed in the nucleotide-bound state, and suggests important insights into the contributions of the nucleotide interaction to the conformational states that are the keys to nitrogenase catalysis. The presence of MgADP in Phe135Trp Fe protein reveals the mechanism of the long-range communication from the nucleotide-binding site that controls its affinity for the MoFe protein component. Structural basis for the changes in redox potential in the nitrogenase Phe135Trp Fe protein with MgADP Bound.,Jeong MS, Jang SB Mol Cells. 2004 Dec 31;18(3):374-82. PMID:15650336 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nitrogenase 3D structures

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