Structural highlights
Function[NQO5_THET8] NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur (Fe-S) centers, to quinones in the respiratory chain. The immediate electron acceptor for the enzyme in this species is menaquinone. 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 required for the synthesis of ATP. The nqo5 subunit may be involved in the stabilization of the complex.[HAMAP-Rule:MF_01357] Publication Abstract from PubMedThe subunits that comprise bacterial complex I (NADH:ubiquinone oxidoreductase) are also found in more complicated mitochondrial enzymes in eukaryotic organisms. Although the Nqo5 subunit is one of these conserved components and important for the formation of complex, it has been little studied. Here, we report structure analyses of isolated Nqo5 from Thermus thermophilus. Biochemical studies indicated that the C-terminal region following the 30-Kd subunit motif is disordered in the isolated state, while the remaining portion is already folded. Crystallographic studies of a trypsin-resistant fragment revealed detailed structural differences in the folded domain between the isolated and complexed states. Characterization of the Nqo5 subunit of bacterial complex I in the isolated state.,Hanazono Y, Takeda K, Miki K FEBS Open Bio. 2016 Jun 8;6(7):687-95. doi: 10.1002/2211-5463.12070. eCollection , 2016 Jul. PMID:27398308[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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