This is the C-terminal conserved coiled coil region of a family of TATA element modulatory factor 1 proteins conserved in eukaryotes [1]. The proteins bind to the TATA element of some RNA polymerase II promoters and repress their activity. by competing with the binding of TATA binding protein. TMF1_TATA_bd is the most conserved part of the TMFs [2]. TMFs are evolutionarily conserved golgins that bind Rab6, a ubiquitous ras-like GTP-binding Golgi protein, and contribute to Golgi organisation in animal [3] and plant cells. The Rab6-binding domain appears to be the same region as this C-terminal family [3].

1: Cloning and chromosomal mapping of a human immunodeficiency virus 1 "TATA" element modulatory factor. Garcia JA, Ou SH, Wu F, Lusis AJ, Sparkes RS, Gaynor RB; Proc Natl Acad Sci U S A. 1992;89:9372-9376. PMID:1409643

2: TMF is a golgin that binds Rab6 and influences Golgi morphology. Fridmann-Sirkis Y, Siniossoglou S, Pelham HR; BMC Cell Biol. 2004;5:18. PMID:15128430

3: Localization and domain characterization of Arabidopsis golgin candidates. Latijnhouwers M, Gillespie T, Boevink P, Kriechbaumer V, Hawes C, Carvalho CM; J Exp Bot. 2007;58:4373-4386. PMID:18182439