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Journal of Virology, March 2006, p. 2118-2126, Vol. 80, No. 5
0022-538X/06/$08.00+0 doi:10.1128/JVI.80.5.2118-2126.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Herpes Simplex Virus Type 1 DNA-Packaging Protein UL17 Is Required for Efficient Binding of UL25 to Capsids
Johanna K. Thurlow,
Mary Murphy,
Nigel D. Stow, and
Valerie G. Preston*
MRC Virology Unit, Institute of Virology, Church Street, Glasgow G11 5JR, United Kingdom
Received 23 September 2005/
Accepted 13 December 2005
Herpes simplex virus type 1 packages its DNA genome into a precursor capsid, referred to as the procapsid. Of the three capsid-associated DNA-packaging proteins, UL17, UL25, and UL6, only UL17 and UL6 appear to be components of the procapsid, with UL25 being added subsequently. To determine whether the association of UL17 or UL25 with capsids was dependent on the other two packaging proteins, B capsids, which lack viral DNA but retain the cleaved internal scaffold, were purified from nonpermissive cells infected with UL17, UL25, or UL6 null mutants and compared with wild-type (wt) B capsids. In the absence of UL17, the levels of UL25 in the mutant capsids were much lower than those in wt B capsids. These results suggest that UL17 is required for efficient incorporation of UL25 into B capsids. B capsids lacking UL25 contained about twofold-less UL17 than wt capsids, raising the possibilities that UL25 is important for stabilizing UL17 in capsids and that the two proteins interact in the capsid. The distribution of UL17 and UL25 on B capsids was examined using immunogold labeling. Both proteins appeared to bind to multiple sites on the capsid. The properties of the UL17 and UL25 proteins are consistent with the idea that the two proteins are important in stabilizing capsid-DNA structures rather than having a direct role in DNA packaging.
* Corresponding author. Mailing address: MRC Virology Unit, Institute of Virology, Church Street, Glasgow G11 5JR, United Kingdom. Phone: 44 141 330 4019. Fax: 44 141 337 2236. E-mail:
v.preston{at}vir.gla.ac.uk.
Present address: Cancer Research UK, Beatson Laboratories, Garscube Estate, Switchback Road, Bearsden, Glasgow G61 1BD, United Kingdom.
Journal of Virology, March 2006, p. 2118-2126, Vol. 80, No. 5
0022-538X/06/$08.00+0 doi:10.1128/JVI.80.5.2118-2126.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
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