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Energy-yielding and energy-consuming reactions

  • Chapter
The Rumen Microbial Ecosystem

Abstract

The work of biological growth depends on the transfer of energy from catabolic (yielding) to anabolic (consuming) reactions (Figure 6.1). Classically, the two reactions have been depicted to be connected by ATP, in the sense that the energy released by, for example, the glycolytic breakdown of sugars is conserved in the form of ATP, which then provides the energy necessary for the biosynthesis of cell material. It is now clear that most organisms, including anaerobes, can conserve energy, in the form of a transmembrane electrochemical gradient of protons, or protonmotive force (Mitchell, 1961; Thauer et al., 1977; Dawes, 1986). However, the protonmotive force drives few biosynthetic processes directly, and the transfer of energy from the protonmotive force to ATP via a membrane-bound reversible ATPase is a vital link between catabolic and anabolic reactions.

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  1. ARS, United States Department of Agriculture and Section of Microbiology, Cornell University, Ithaca, New York, USA

    J. B. Russell

  2. Rowett Research Institute, Aberdeen, UK

    R. J. Wallace

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  1. Department of Molecular and Cell Biology, University of Aberdeen, UK

    P. N. Hobson

  2. The Nutrition Division, The Rowett Research Institute, Aberdeen, UK

    C. S. Stewart

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Russell, J.B., Wallace, R.J. (1997). Energy-yielding and energy-consuming reactions. In: Hobson, P.N., Stewart, C.S. (eds) The Rumen Microbial Ecosystem. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1453-7_6

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