Stability and functionality of cysteine-less F(O)F1 ATP synthase from Escherichia coli

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Abstract

All 21 native cysteines in the Escherichia coli F(O)F1 ATP synthase were replaced by alanines. In isolated E. coli membranes, ATP-dependent proton pumping, turnover of ATP hydrolysis and steady-state transition state thermodynamic parameters of the cysteine-less enzyme were similar to wild- type. The cysteine-less enzyme was solubilized in n-octyl β-D- glucopyranoside, purified by affinity chromatography, and reconstituted into pre-formed liposomes made from E. coli lipids. The properties of the reconstituted, purified enzyme were not significantly different from the membranous enzyme. These data demonstrate that cysteine-less F(O)F1 is biochemically stable and has functionality similar to wild-type.

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Kuo, P. H., Ketchum, C. J., & Nakamoto, R. K. (1998). Stability and functionality of cysteine-less F(O)F1 ATP synthase from Escherichia coli. FEBS Letters, 426(2), 217–220. https://doi.org/10.1016/S0014-5793(98)00337-8

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