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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Role of pH gradient and membrane potential in dipeptide transport in intestinal and renal brush-border membrane vesicles from the rabbit. Studies with L-carnosine and glycyl-L-proline.

We examined the role of pH gradient and membrane potential in dipeptide transport in purified intestinal and renal brush-border membrane vesicles which were predominantly oriented right-side out. With an intravesicular pH of 7.5, changes in extravesicular pH significantly affected the transport of glycyl-L-proline and L-carnosine, and optimal dipeptide transport occurred at an extravesicular pH of 5.5-6.0 in both intestine and kidney. When the extravesicular pH was 5.5, glycyl-L-proline transport was accelerated 2-fold by the presence of an inward proton gradient. A valinomycin-induced K+ diffusion potential (interior-negative) stimulated glycyl-L-proline transport, and the stimulation was observed in the presence and absence of Na+. A carbonyl cyanide p-trifluoromethoxyphenylhydrazone-induced H+ diffusion potential (interior-positive) reduced dipeptide transport. It is suggested that glycyl-L-proline and proton(s) are cotransported in intestinal and renal brush-border membrane vesicles, and that the process results in a net transfer of positive charge.[1]

References

  1. Role of pH gradient and membrane potential in dipeptide transport in intestinal and renal brush-border membrane vesicles from the rabbit. Studies with L-carnosine and glycyl-L-proline. Ganapathy, V., Leibach, F.H. J. Biol. Chem. (1983) [Pubmed]
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