The 2-hydroxycarboxylate transporter family is a family of secondary transporters found exclusively in the bacterial kingdom. They function in the metabolism of the di- and tricarboxylates malate and citrate, mostly in fermentative pathways involving decarboxylation of malate or oxaloacetate [1].

1: The 2-hydroxycarboxylate transporter family: physiology, structure, and mechanism. Sobczak I, Lolkema JS; Microbiol Mol Biol Rev. 2005;69:665-695. PMID:16339740

2: Secondary transporters of the 2HCT family contain two homologous domains with inverted membrane topology and trans re-entrant loops. Lolkema JS, Sobczak I, Slotboom DJ; FEBS J. 2005;272:2334-2344. PMID:15853816