Members of this family of proteins are a component of the heterotetrameric Sec62/63 complex composed of SEC62, SEC63, SEC66 and SEC72. The Sec62/63 complex associates with the Sec61 complex to form the Sec complex. Sec 66 is involved in SRP-independent post-translational translocation across the endoplasmic reticulum and functions together with the Sec61 complex and KAR2 in a channel-forming translocon complex. Furthermore, Sec66 is also required for growth at elevated temperatures [1][2][3][4].

1: Structural and functional characterization of Sec66p, a new subunit of the polypeptide translocation apparatus in the yeast endoplasmic reticulum. Feldheim D, Yoshimura K, Admon A, Schekman R; Mol Biol Cell. 1993;4:931-939. PMID:8257795

2: Suppression of a sec63 mutation identifies a novel component of the yeast endoplasmic reticulum translocation apparatus. Kurihara T, Silver P; Mol Biol Cell. 1993;4:919-930. PMID:8257794

3: Assembly of yeast Sec proteins involved in translocation into the endoplasmic reticulum into a membrane-bound multisubunit complex. Deshaies RJ, Sanders SL, Feldheim DA, Schekman R; Nature. 1991;349:806-808. PMID:2000150

4: Posttranslational protein transport in yeast reconstituted with a purified complex of Sec proteins and Kar2p. Panzner S, Dreier L, Hartmann E, Kostka S, Rapoport TA; Cell. 1995;81:561-570. PMID:7758110