This family consists of various cation transport proteins (Trk) and V-type sodium ATP synthase subunit J or translocating ATPase J EC:3.6.1.34. These proteins are involved in active sodium up-take utilising ATP in the process. TrkH a member of the family Swiss:P76769 from E. coli is a hydrophobic membrane protein and determines the specificity and kinetics of cation transport by the TrK system in E. coli [2].

1: Sequencing analysis of a 40.2 kb fragment of yeast chromosome X reveals 19 open reading frames including URA2 (5' end), TRK1, PBS2, SPT10, GCD14, RPE1, PHO86, NCA3, ASF1, CCT7, GZF3, two tRNA genes, three remnant delta elements and a Ty4 transposon. Cziepluch C, Kordes E, Pujol A, Jauniaux JC; Yeast 1996;12:1471-1474. PMID:8948101

2: TrkH and its homolog, TrkG, determine the specificity and kinetics of cation transport by the Trk system of Escherichia coli. Schlosser A, Meldorf M, Stumpe S, Bakker EP, Epstein W; J Bacteriol 1995;177:1908-1910. PMID:7896723

3: Trk1 and Trk2 define the major K(+) transport system in fission yeast. Calero F, Gomez N, Arino J, Ramos J; J Bacteriol 2000;182:394-399. PMID:10629185