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Journal of Virology, January 2000, p. 474-482, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The UL25 Protein of Pseudorabies Virus Associates with Capsids and Localizes to the Nucleus and to Microtubules

Karin Kaelin,* Sybille Dezélée, Marie Jo Masse, Françoise Bras, and Anne Flamand

Laboratoire de Génétique des Virus, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette Cedex, France

Received 2 June 1999/Accepted 20 September 1999

The UL25 gene of pseudorabies virus (PrV) can encode a protein of about 57 kDa which is well conserved among herpesviruses. The UL25 protein of herpes simplex virus type 1 is a capsid constituent involved in virus penetration and capsid maturation. To identify and characterize the UL25 gene product of PrV, polyclonal mouse anti-UL25 antibodies were raised to a bacterially expressed fusion protein. In immunoblotting and immunoprecipitation assays of PrV-infected cell lysates, these anti-UL25 antisera specifically recognized a protein of the expected size with late expression kinetics. This 57-kDa product was also present in purified virions and was found to be associated with all types of capsids. Synthesis of a protein migrating at the same size point was directed from the eukaryotic expression plasmid pCG-UL25. To determine the subcellular localization of UL25, immunofluorescence studies with anti-UL25 antisera were performed on Nonidet P-40-extracted COS-7 cells infected with PrV or transfected with pCG-UL25. In PrV-infected cells, newly synthesized UL25 is directed mainly to distinct nuclear compartments, whereas UL25 expressed in the absence of other viral proteins is distributed more uniformly in the nucleus and colocalizes also with microtubules. To study the fate of UL25 at very early stages of infection, immunofluorescence experiments were performed on invading PrV particles in the presence or absence of drugs that specifically depolymerize components of the cytoskeleton. We found that the incoming nucleocapsids colocalize with microtubules during their transport to the nucleus and that UL25 remains associated with nucleocapsids during this transport.

* Corresponding author. Mailing address: Laboratoire de Virologie, Hôpital Saint-Vincent-de-Paul, 82 Ave. Denfert-Rochereau, 75674 Paris Cedex 14, France. Phone: 33-1-40-48-82-41. Fax: 33-1-40-48-83-51. E-mail: karin.kaelin{at}wanadoo.fr.

Journal of Virology, January 2000, p. 474-482, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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