InterPro domain: IPR004773

A related transporter from plants is known as HKT1. It was identified in barley as a high-affinity potassium transporter [ 1 ]. In Arabidopsis, HKT1 functions as a salt tolerance determinant that controls Na+ entry into plant roots [ 2 ].

Trk transporters play a crucial roles in K(+) transport in yeasts and filamentous fungi [ 3 , 4 ].

1. The HAK1 gene of barley is a member of a large gene family and encodes a high-affinity potassium transporter. Plant Cell 9, 2281-9
2. AtHKT1 is a salt tolerance determinant that controls Na(+) entry into plant roots. Proc. Natl. Acad. Sci. U.S.A. 98, 14150-5
3. Role of Saccharomyces cerevisiae Trk1 in stabilization of intracellular potassium content upon changes in external potassium levels. Biochim. Biophys. Acta 1838, 127-33
4. Molecular and functional characterization of a Na(+)-K(+) transporter from the Trk family in the ectomycorrhizal fungus Hebeloma cylindrosporum. J. Biol. Chem. 282, 26057-66