Involved in a type II secretion system (T2SS, formerly general secretion pathway, GSP) for the export of folded proteins across the outer membrane. Interacts with outer cell membrane protein GspD2 in the periplasm. Encoded in a type II secretion system (T2SS-beta); this strain encodes 2 T2SS but only this one (beta) is expressed under standard laboratory conditions. Belongs to the GSP C family. Truncated N-terminus.