ThrE is a family of bacterial and Archaeal proteins that catalyse the export of L-threonine from the cell [1]. UniProtKB:Q79VD1 has been characterised as being necessary for this export. The domain exhibits 10 putative TMs and catalyses the proton-motive-force-dependent efflux of threonine and serine [2].

1: Identification of glyA (encoding serine hydroxymethyltransferase) and its use together with the exporter ThrE to increase L-threonine accumulation by Corynebacterium glutamicum. Simic P, Willuhn J, Sahm H, Eggeling L; Appl Environ Microbiol. 2002;68:3321-3327. PMID:12089010

2: Influence of threonine exporters on threonine production in Escherichia coli. Kruse D, Kramer R, Eggeling L, Rieping M, Pfefferle W, Tchieu JH, Chung YJ, Jr Saier MH, Burkovski A; Appl Microbiol Biotechnol. 2002;59:205-210. PMID:12111147