Rhesus factors and ammonium: a function in efflux?

Ludewig, Uwe; von Wirén, Nico; Rentsch, Doris; Frommer, Wolf B. (2001). Rhesus factors and ammonium: a function in efflux? Genome biology and evolution, 2(3), pp. 1-5. Oxford University Press 10.1186/gb-2001-2-3-reviews1010

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Completion of fungal, plant and human genomes paved the way to the identification of erythrocytic rhesus proteins and their kidney homologs as ammonium transporters.

Ammonium is the preferred nitrogen source of bacteria and fungi, and plants acquire nitrogen from the soil in the form of ammonium [1]. In animals and humans, assimilated forms of nitrogen - amino acids - are much preferred for nutrition, and, in the case of ammonotelic animals, ammonium is used for the excretion of nitrogen instead. In the human kidney, ammonium is produced, reabsorbed and excreted as a means to maintain pH balance and to get rid of surplus inorganic nitrogen. Whether ammonium transport also has a role in the pH regulation of other organs is not known and the molecular mechanisms were not, up to now, understood.

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