“Whoa! It's like Spotify but for academic articles.”

Instant Access to Thousands of Journals for just $40/month

Get 2 Weeks Free

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
Loading next page...

You're reading a free preview. Subscribe to read the entire article.

And millions more from thousands of peer-reviewed journals, for just $40/month

Get 2 Weeks Free

To be the best researcher, you need access to the best research

  • With DeepDyve, you can stop worrying about how much articles cost, or if it's too much hassle to order — it's all at your fingertips. Your research is important and deserves the top content.
  • Read from thousands of the leading scholarly journals from Springer, Elsevier, Nature, IEEE, Wiley-Blackwell and more.
  • All the latest content is available, no embargo periods.