1887

Abstract

mutant 62004 carries a null allele of , encoding the E1β subunit of pyruvate dehydrogenase, which converts pyruvate to acetyl-CoA. This mutant completely lacks pyruvate oxidation activities yet grows aerobically on C dicarboxylates (succinate, L-malate) as sole energy source, albeit slowly, and displays pleiotropic growth defects consistent with physiological acetyl-CoA limitation. Temperature-sensitive (ts), conditional-lethal derivatives of the mutant lack (methyl)malonate semialdehyde dehydrogenase activity, which thus also allows L-malate conversion to acetyl-CoA. The mutant remains able to fix N in aerobic culture, but is unable to fix N in symbiosis with host plants and cannot grow microaerobically. In culture, wild-type can use acetate, β-D-hydroxybutyrate and nicotinate – all direct precursors of acetyl-CoA – as sole C and energy source for aerobic, but not microaerobic growth. Paradoxically, acetyl-CoA is thus a required intermediate for microaerobic oxidative energy transduction while not itself oxidized. Accordingly, energy transduction under aerobic and microaerobic conditions is qualitatively different.

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2001-08-01
2020-09-25
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