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Energy Coupling for Membrane Transport

Energy Coupling for Membrane Transport PRIMARY AND SECONDARY TRANSPORT PROCESSES Metabolic energy may be supplied to membrane transport processes either directly, by mechanisms which couple the "uphill" movement of, for instance, Na+ or H+ with a chemical reaction such as the hydrolysis of ATP, or indirectly, by mecha­ nisms which couple the transport of other substances to the back-fluxes H+ down their electrochemical gradients (cf 124). Recent research has attempted to define more precisely the primary metabolic transport processes, and at the same time has revealed the great extent and importance of the secondary mechanisms of cotransport and countertransport [symport and antiport in the terminology of Mitchell (122, 123)]. Because the primary and secondary transport processes fre­ quently interact with each other via the membrane potential, increasing attention is being paid to the role of the potential in energy coupling and to whether a given t ransport process is electrogenic, i.e. whether it contributes directly to the potential by transporting a net electric charge across the membrane. In this review we will consider the nature and role of electrogenic H+ efflux and other primary transport processes at the plasmalemma and, where possible, at the tonoplast of plant cells, and will discuss the mode http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews
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