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Journal of Virology, December 2000, p. 11608-11618, Vol. 74, No. 24
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Null Mutation in the UL36 Gene of Herpes Simplex Virus Type 1 Results in Accumulation of Unenveloped DNA-Filled Capsids in the Cytoplasm of Infected Cells

Prashant J. Desai*

Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205

Received 18 July 2000/Accepted 18 September 2000

The UL36 open reading frame (ORF) encodes the largest herpes simplex virus type 1 (HSV-1) protein, a 270-kDa polypeptide designated VP1/2, which is also a component of the virion tegument. A null mutation was generated in the UL36 gene to elucidate its role in the virus life cycle. Since the UL36 gene specifies an essential function, complementing cell lines transformed for sequences encoding the UL36 ORF were made. A mutant virus, designated KDelta UL36, that encodes a null mutation in the UL36 gene was isolated and propagated in these cell lines. When noncomplementing cells infected with KDelta UL36 were analyzed, both terminal genomic DNA fragments and DNA-containing capsids (C capsids) were detected; therefore, UL36 is not required for cleavage or packaging of DNA. Sedimentation analysis of lysates from mutant-infected cells revealed the presence of particles that have the physical characteristics of C capsids. In agreement with this, polypeptide profiles of the mutant particles revealed an absence of the major envelope and tegument components. Ultrastructural analysis revealed the presence of numerous unenveloped DNA containing capsids in the cytoplasm of KDelta UL36-infected cells. The UL36 mutant particles were tagged with the VP26-green fluorescent protein marker, and their movement was monitored in living cells. In KDelta UL36-infected cells, extensive particulate fluorescence corresponding to the capsid particles was observed throughout the cytosol. Accumulation of fluorescence at the plasma membrane which indicated maturation and egress of virions was observed in wild-type-infected cells but was absent in KDelta UL36-infected cells. In the absence of UL36 function, DNA-filled capsids are produced; these capsids enter the cytosol after traversing the nuclear envelope and do not mature into enveloped virus. The maturation and egress of the UL36 mutant particles are abrogated, possibly due to a late function of this complex polypeptide, i.e., to target capsids to the correct maturation pathway.

* Mailing address: Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, 725 N. Wolfe St., Baltimore, MD 21205. Phone: (410) 614-1581. Fax: (410) 955-3023. E-mail: pdesai{at}jhmi.edu.

Journal of Virology, December 2000, p. 11608-11618, Vol. 74, No. 24
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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