accessory subunit of the [[protein|780FDF3DD260287428B397FFE7F44DDF1917381C]]-[[protein|E60FC9C9B273DD6B07B7B95819525DE5F35113CE]] [SW|protein secretion] complex, similar to phage shock protein, resistance against oxidative stress and cell wall antibiotics (such as daptamycin), secondary bacitracin resistance determinant