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Herpesvirus nucleocapsids are assembled in the nucleus, whereas maturation into infectious virions takes place in the cytosol. Since, due to their size, nucleocapsids cannot pass the nuclear pores, they traverse the nuclear envelope by vesicle-mediated transport. Nucleocapsids bud at the inner nuclear membrane into the perinuclear space, forming primary enveloped particles and are released into the cytosol after fusion of the primary envelope with the outer nuclear membrane. The nuclear egress complex (NEC), consisting of the conserved herpesvirus proteins (p)UL31 and pUL34, is required for this process, whereas the viral glycoproteins gB and gH, which are essential for fusion during penetration, are not. We recently described herpesvirus-induced nuclear envelope breakdown (NEBD) as an alternative egress pathway used in the absence of the NEC. However, the molecular details of this pathway are still unknown. It has been speculated that glycoproteins involved in fusion during entry might play a role in NEBD. By deleting genes encoding glycoproteins gB and gH from the genome of NEBD-inducing pseudorabies viruses, we demonstrate that these glycoproteins are not required for NEBD but are still necessary for syncytium formation, again emphasizing fundamental differences in herpesvirus-induced alterations at the nuclear envelopes and plasma membranes of infected cells.

Glycoproteins gB and gH Are Required for Syncytium Formation but Not for Herpesvirus-Induced Nuclear Envelope Breakdown