Members of this family of proteins include predicted membrane proteins homologous to YukC in B. subtilis. The YukC protein family would participate to the formation of a translocon required for the secretion of WXG100 proteins (Pfam:PF06013) in monoderm bacteria, the WXG100 protein secretion system (Wss). This family includes EssB in Staphylococcus aureus.

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