9fe0

Crystal Structure of reduced NuoEF variant R66G(NuoF) from Aquifex aeolicus bound to NAD+

spinqualitylabelsall models 9fe0, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9fe0 is a 4 chain structure with sequence from Aquifex aeolicus VF5. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: CL, FES, FNR, GOL, NA, NAD, SF4, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NUOE_AQUAE NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur (Fe-S) centers, to quinones in the respiratory chain. Couples the redox reaction to proton translocation (for every two electrons transferred, four hydrogen ions are translocated across the cytoplasmic membrane), and thus conserves the redox energy in a proton gradient (By similarity). Publication Abstract from PubMed Energy converting NADH:ubiquinone oxidoreductase, complex I, is the first enzyme of respiratory chains in most eukaryotes and many bacteria. Mutations in genes encoding subunits of human complex I may lead to its dysfunction resulting in a diverse clinical pattern. The effect of mutations on the protein structure is not known. Here, we focus on mutations R88G, E246K, P252R and E377K that are found in subunit NDUFV1 comprising the NADH binding site of complex I. Homologous mutations were introduced into subunit NuoF of Aquifex aeolicus complex I and it was attempted to crystallize variants of the electron input module, NuoEF, with bound substrates in the oxidized and reduced state. The E377K variant did not form crystals most likely due to an improper protein assembly. The architecture of the NADH binding site is hardly affected by the other mutations indicating its unexpected structural robustness. The R88G, E246K and P252R mutations led to small local structural rearrangements that might be related to their pathogenicity. These minor structural changes involve substrate binding, product release and the putative formation of reactive oxygen species. The structural consequences of the mutations as obtained with the bacterial enzyme might thus help to contribute to the understanding of disease causing mutations. Structural robustness of the NADH binding site in NADH:ubiquinone oxidoreductase (complex I).,Goppert-Asadollahpour S, Wohlwend D, Friedrich T Biochim Biophys Acta Bioenerg. 2024 Jul 1;1865(4):149491. doi: , 10.1016/j.bbabio.2024.149491. PMID:38960077 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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