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- W2046759813 abstract "The proton-translocating NADH:ubiquinone oxidoreductase (complex I) has been purified from Aquifex aeolicus, a hyperthermophilic eubacterium of known genome sequence. The purified detergent solubilized enzyme is highly active above 50 °C. The specific activity for electron transfer from NADH to decylubiquinone is 29 U/mg at 80 °C. The A. aeolicus complex I is completely sensitive to rotenone and 2-n-decyl-quinazoline-4-yl-amine. SDS polyacrylamide gel electrophoresis shows that it may contain up to 14 subunits. N-terminal amino acid sequencing of the bands indicates the presence of a stable subcomplex, which is composed of subunits E, F, and G. The isolated complex is highly stable and active in a temperature range from 50 to 90 °C, with a half-life of about 10 h at 80 °C. The activity shows a linear Arrhenius plot at 50−85 °C with an activation energy at 31.92 J/mol K. Single particle electron microscopy shows that the A. aeolicus complex I has the typical L-shape. However, visual inspection of averaged images reveals many more details in the external arm of the complex than has been observed for complex I from other sources. In addition, the angle (90°) between the cytoplasmic peripheral arm and the membrane intrinsic arm of the complex appears to be invariant." @default.
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- W2046759813 date "2003-02-20" @default.
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- W2046759813 title "Isolation, Characterization and Electron Microscopic Single Particle Analysis of the NADH:Ubiquinone Oxidoreductase (Complex I) from the Hyperthermophilic Eubacterium <i>Aquifex aeolicus</i>" @default.
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- W2046759813 doi "https://doi.org/10.1021/bi026876v" @default.
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