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Importance of Rhodospirillum rubrum H⁺-Pyrophosphatase under Low-Energy Conditions

Departamento de Bioquímica, Facultad de Medicina,¹ Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México, D.F., Mexico²

Received 23 March 2004/ Accepted 29 June 2004

The physiological role of the membrane-bound pyrophosphatase of Rhodospirillum rubrum was investigated by the characterization of a mutant strain. Comparisons of growth levels between the wild type and the mutant under different low-potential conditions and during transitions between different metabolisms indicate that this enzyme provides R. rubrum with an alternative energy source that is important for growth in low-energy states.

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