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Journal of Virology, April 2001, p. 3675-3684, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3675-3684.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Egress of Alphaherpesviruses: Comparative Ultrastructural Study

Harald Granzow,1,* Barbara G. Klupp,2 Walter Fuchs,2 Jutta Veits,2 Nikolaus Osterrieder,2 and Thomas C. Mettenleiter2

Institutes of Infectology1 and Molecular Biology,2 Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, D-17498 Insel Riems, Germany

Received 27 November 2000/Accepted 23 January 2001

Egress of four important alphaherpesviruses, equine herpesvirus 1 (EHV-1), herpes simplex virus type 1 (HSV-1), infectious laryngotracheitis virus (ILTV), and pseudorabies virus (PrV), was investigated by electron microscopy of infected cell lines of different origins. In all virus-cell systems analyzed, similar observations were made concerning the different stages of virion morphogenesis. After intranuclear assembly, nucleocapsids bud at the inner leaflet of the nuclear membrane, resulting in enveloped particles in the perinuclear space that contain a sharply bordered rim of tegument and a smooth envelope surface. Egress from the perinuclear cisterna primarily occurs by fusion of the primary envelope with the outer leaflet of the nuclear membrane, which has been visualized for HSV-1 and EHV-1 for the first time. The resulting intracytoplasmic naked nucleocapsids are enveloped at membranes of the trans-Golgi network (TGN), as shown by immunogold labeling with a TGN-specific antiserum. Virions containing their final envelope differ in morphology from particles within the perinuclear cisterna by visible surface projections and a diffuse tegument. Particularly striking was the addition of a large amount of tegument material to ILTV capsids in the cytoplasm. Extracellular virions were morphologically identical to virions within Golgi-derived vesicles, but distinct from virions in the perinuclear space. Studies with gB- and gH-deleted PrV mutants indicated that these two glycoproteins, which are essential for virus entry and direct cell-to-cell spread, are dispensable for egress. Taken together, our studies indicate that the deenvelopment-reenvelopment process of herpesvirus maturation also occurs in EHV-1, HSV-1, and ILTV and that membrane fusion processes occurring during egress are substantially different from those during entry and direct viral cell-to-cell spread.


* Corresponding author. Mailing address: Institute of Infectology, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, Boddenblick 5A, D-17498 Insel Riems, Germany. Phone: 49-38351-7206. Fax: 49-38351-7151. E-mail: Harald.Granzow{at}rie.bfav.de.


Journal of Virology, April 2001, p. 3675-3684, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3675-3684.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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Copyright © 2001 by the American Society for Microbiology. All rights reserved.