Members of this family are restricted to the Firmicutes lineage (low-GC Gram-positive bacteria) and appear to be paralogous to, and much more divergent than, the preprotein translocase SecY. Members include the SecY2 protein of the accessory Sec system in Streptococcus gordonii, involved in export of the highly glycosylated platelet-binding protein GspB. [Protein fate, Protein and peptide secretion and trafficking]
Lu S et al.(2020). "CDD/SPARCLE: the conserved domain database in 2020.",