Late viral interference induced by transdominant Gag of an endogenous retrovirus

Mura, M., Murcia, P.R. , Caporale, M., Spencer, T.E., Nagashima, K., Rein, A. and Palmarini, M. (2004) Late viral interference induced by transdominant Gag of an endogenous retrovirus. Proceedings of the National Academy of Sciences of the United States of America, 101(30), pp. 11117-11122. (doi:10.1073/pnas.0402877101)

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Publisher's URL: http://dx.doi.org/10.1073/pnas.0402877101

Abstract

The sheep genome harbors 20 copies of endogenous retroviruses (enJSRVs) closely related to the exogenous and oncogenic Jaagsiekte sheep retrovirus (JSRV). One of the enJSRV loci, enJS56A1, has a defect for viral exit. We report a previously uncharacterized mechanism of retroviral interference. The defect possessed by enJS56A1 is determined by its Gag protein and is transdominant over the exogenous JSRV. By electron microscopy, cells transfected by enJS56A1, with or without JSRV, show agglomerates of tightly packed intracellular particles most abundant in the perinuclear area. The defect in exit and ability to interfere with JSRV exit could be largely attributed to the presence of tryptophan, rather than arginine, at position 21 of enJS56A1 Gag; C98 and V102 also contribute to these properties. We found that enJS56A1 or similar loci containing W21, C98, and V102 are expressed in sheep endometrium. enJS56A1 is a previously unrecognized example of a naturally occurring endogenous retrovirus expressing a dominant negative Gag acting at a late step of the viral replication cycle. Understanding the late blockade exerted by enJS56A1 could unravel fundamental aspects of retroviral biology and help to devise new antiretroviral strategies.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Caporale, Dr Marco and Palmarini, Professor Massimo and Mura, Dr Manuela and Murcia, Dr Pablo
Authors: Mura, M., Murcia, P.R., Caporale, M., Spencer, T.E., Nagashima, K., Rein, A., and Palmarini, M.
Subjects:S Agriculture > SF Animal culture > SF600 Veterinary Medicine
Q Science > QR Microbiology > QR355 Virology
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Proceedings of the National Academy of Sciences of the United States of America
Publisher:National Academy of Sciences
ISSN:0027-8424
ISSN (Online):1091-6490
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