UL1

UL1, also known as Envelope coprotein L. The heterodimer glycoprotein H-glycoprotein L is required for the fusion of viral and plasma membranes leading to virus entry into the host cell. It acts as a functional inhibitor of gH and maintains gH in an inhibited form. Upon binding to host integrins, gL dissociates from gH lead to activation of the viral fusion glycoproteins gB and gH.