Members of this protein family are homologous to SecA and part of the accessory Sec system. This system, including both five core proteins for export and a variable number of proteins for glycosylation, operates in certain Gram-positive pathogens for the maturation and delivery of serine-rich glycoproteins such as the cell surface glycoprotein GspB in Streptococcus gordonii. [Protein fate, Protein and peptide secretion and trafficking]
Jiyao W et al.(2023). "The conserved domain database in 2023.",