Endogenous retrovirus group 3 member 1 Env polyprotein (ERV3-1)

Retroviral envelope proteins mediate receptor recognition and membrane fusion during early infection. Endogenous envelope proteins may have kept, lost or modified their original function during evolution.

This endogenous envelope protein has lost its fusogenic properties. It can inhibit cell growth through reduction expression of cyclin B1 and increased expression of p21 in vitro.