All functionally characterised members of the ammonium transporter family are ammonia or ammonium uptake transporters. Some, but not others, also transport methylammonium. The mechanism of energy coupling, if any, to methyl-NH2 or NH3 uptake by the AmtB protein of Escherichia coli is not entirely clear. NH4+ uniport driven by the proton motive force (pmf), energy independent NH3 facilitation, and NH4+/K+ antiport have been proposed as possible transport mechanisms. In Corynebacterium glutamicum (Brevibacterium flavum) and Arabidopsis thaliana (Mouse-ear cress), uptake via the Amt1 homologues of AmtB has been reported to be driven by the pmf.

This entry represents ammonium transporters belonging to the Amt family, but it does not include the Rhesus (Rh) subgroup.

All functionally characterised members of the ammonium transporter family are ammonia or ammonium
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