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J Virol, April 1998, p. 3045-3050, Vol. 72, No. 4
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Herpes Simplex Virus DNA Cleavage and Packaging: Association of Multiple Forms of UL15-Encoded Proteins with B Capsids Requires at Least the UL6, UL17, and UL28 Genes

Brandy Salmon and Joel D. Baines*

Department of Microbiology and Immunology, Cornell University, Ithaca, New York 14853

Received 14 November 1997/Accepted 23 December 1997

The UL15 gene of herpes simplex virus (HSV) is one of several genes required for the packaging of viral DNA into intranuclear B capsids to produce C capsids that become enveloped at the inner nuclear membrane. A rabbit antiserum directed against UL15-encoded protein recognized three proteins with apparent Mrs of 79,000, 80,000, and 83,000 in highly purified B capsids. The 83,000-Mr protein was detected in type C capsids and comigrated with the product of a UL15 cDNA transcribed and translated in vitro. The 83,000- and 80,000-Mr proteins were readily detected in purified virions. Inasmuch as (i) none of these proteins were detectable in capsids purified from cells infected with HSV-1(Delta UL15), a virus lacking an intact UL15 gene, and (ii) corresponding proteins in capsids purified from cells infected with a recombinant virus [HSV-1(R7244), containing a 20-codon tag at the 3' end of UL15] were decreased in electrophoretic mobility relative to the wild-type proteins, we conclude that the proteins with apparent Mrs of 83,000, 80,000, and 79,000 are products of UL15 with identical C termini. The 79,000-, 80,000-, and 83,000-Mr proteins remained associated with B capsids in the presence of 0.5 M guanidine HCl and remained detectable in capsids treated with 2.0 M guanidine HCl and lacking proteins associated with the capsid core. These data, therefore, indicate that UL15-encoded proteins are integral components of B capsids. Only the 83,000-Mr protein was detected in B capsids purified from cells infected with viruses lacking the UL6, UL17, or UL28 genes, which are required for DNA cleavage and packaging, suggesting that capsid association of the 80,000- and 79,000-Mr proteins requires intact cleavage and packaging machinery. These data, therefore, indicate that capsid association of the 80,000- and 79,000-Mr UL15-encoded proteins reflects a previously unrecognized step in the DNA cleavage and packaging reaction.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, C5169 Veterinary Education Center, Cornell University, Ithaca, NY 14853. Phone: (607) 253-3385. Fax: (607) 253-3384. E-mail: jdb11{at}cornell.edu.




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