Application 1-Deoxymannojirimycin (DMM) hydrochloride is an inhibitor of N-linked glycosylationan and has antiviral activity. Derivatives of deoxymannojirimycin may have anti-HIV activity. It has been used for treatment of T lymphocytes and to study it′s effect on allogeneic cytotoxic T lymphocytes (CTL)1. It is used for studies on Golgi-mediated glycoprotein processing. Biochem/physiol Actions 1-Deoxymannojirimycin is an inhibitor of N-linked glycosylation. It is a mannosidase I inhibitor, alters cell-surface complex carbohydrate structure as assayed by PHA-L binding, and increases high mannose structures as indicated by the increased Con-A binding1.