NDLI: Protease-Dependent Uncoating of a Complex Retrovirus†

Content Provider	PubMed Central
Author	Jacqueline, Lehmann-che Giron, Marie-lou Delelis, Olivier Martin, Löchelt Patricia, Bittoun Tobaly-tapiero, Joelle De, Thé Hugues Ali, Saïb
Copyright Year	2005
Abstract	Although retrovirus egress and budding have been partly unraveled, little is known about early stages of the replication cycle. In particular, retroviral uncoating, a process during which incoming retroviral cores are altered to allow the integration of the viral genome into host chromosomes, is poorly understood. To get insights into these early events of the retroviral cycle, we have used foamy complex retroviruses as a model. In this report, we show that a protease-defective foamy retrovirus is noninfectious, although it is still able to bud and enter target cells efficiently. Similarly, a retrovirus mutated in an essential viral protease-dependent cleavage site in the central part of Gag is noninfectious. Following entry, wild-type and mutant retroviruses are able to traffic along microtubules towards the microtubule-organizing center (MTOC). However, whereas nuclear import of Gag and of the viral genome was observed for the wild-type virus as early as 8 hours postinfection, incoming capsids and genome from mutant viruses remained at the MTOC. Interestingly, a specific viral protease-dependent Gag cleavage product was detected only for the wild-type retrovirus early after infection, demonstrating that cleavage of Gag by the viral protease at this stage of the virus life cycle is absolutely required for productive infection, an unprecedented observation among retroviruses.
Related Links	http://dx.doi.org/10.1128/jvi.79.14.9244-9253.2005
Ending Page	9253
Page Count	10
Starting Page	9244
File Format	PDF
ISSN	0022538X
e-ISSN	10985514
Journal	Journal of Virology
Issue Number	14
Volume Number	79
Language	English
Publisher	American Society for Microbiology
Publisher Date	2005-07-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Immunology Virology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Virology Immunology Microbiology Insect Science

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