... of an induced membrane potential (inside negative; K + /valinomycin). External amiloride (competitive inhibitor; K i =660 μ mol l −1 ) and a monoclonal antibody raised against proteins associated with the lobster ( Homarus americanus ) electrogenic 2Na + /1H + antiporter both inhibited approximately half...

...G. A. Ahearn; Z. Zhuang; J. Duerr; V. Pennington ABSTRACT In recent years, an electrogenic 2Na + /1H + antiporter has been identified in a variety of invertebrate epithelial brush-border membranes of gut, kidney and gill tissues. The antiporter differs significantly in its physiological properties...

...George A. Gerencser; Bruce R. Stevens ABSTRACT Thermodynamic measurements are required to confirm whether cloned transport-associated proteins in a membrane truly constitute a functional transport system. Symport or antiport, catalyzed by native systems or by cloned proteins in membranes, can lead...

... already paid off in the cloning of a Ca 2+ /H + antiporter, and we anticipate more cases in the future. An especially good example of how this approach leads in unexpected directions is the discovery that a tetracycline export system in B. subtilis may have been derived from a Na + /H + exchanger...

... with those of an apparently unique recently described crustacean electrogenic antiporter. In starfish BBMV 22 Na uptake was markedly enhanced by an outwardly directed pH gradient and membrane potential (inside negative) compared to control short-circuited vesicles. External amiloride abolished...

... protein −1 10s −1 . Transport of [ 3 H]acetate was not significantly affected by inhibitory drugs specific for anion exchangers. This study suggests that there is a specific antiport system for anions that is shared by bicarbonate and short-chain volatile fatty acids in the intestinal brush-border...

... was not significantly affected by furosemide. Evidence was found to indicate the existence of Na + /H + and C1 − /HCO 3 – antiport mechanisms for NaCl transport in tilapia intestinal BBMV. An outwardly directed proton gradient (pH 6·0 in, pH 7·5 out) stimulated the uptake of Na + above that of the control (pH 7·5...