Involved in the biosynthesis of osmoregulated periplasmic glucans (OPGs). Pathogenicity factor. Required for both the expression of disease symptoms on host plants and the development of the hypersensitive reaction on non-host plants. Glycan metabolism; osmoregulated periplasmic glucan (OPG) biosynthesis. Belongs to the glycosyltransferase 2 family. OpgH subfamily. Truncated C-terminus.