Can suppress growth and secretion defects in E.coli secA and secB mutants (PubMed:1435734). Probably a molecular chaperone for exported proteins or may act by stabilizing the SecA protein (PubMed:1435734, PubMed:10816431). Homodimer (PubMed:17372352). Probably binds SecA and prePhoB (PubMed:10816431). Probably interacts with proSdpC (PubMed:13129613). Present in exponentially growing cells (at protein level). Grows normally, reduced secretion of SdpC (formerly YvaY) and another 36 kDa protein.