Abstract:
:Assembly and maturation of retroviral particles requires the aggregation and controlled proteolytic cleavage of polyprotein core precursors by a precursor-encoded protease (PR). Active, mature retroviral PR is a dimer, and the accumulation of precursors at sites of assembly may facilitate subunit interaction and subsequent activation of this enzyme. In addition, it has been suggested that cellular cytoplasmic components act as inhibitors of PR activity, so that processing is delayed until the nascent virions leave this compartment and separate from the surface of host cells. To investigate the mechanisms that control PR activity during virus assembly, we studied the in vivo processing of retroviral gag precursors that contain tandemly linked PR subunits in which dimerization is concentration independent. Sequences encoding four different linked protease dimers were independently joined to the end of the Rous sarcoma virus (RSV) gag gene in a simian virus 40-based plasmid vector which expresses a myristoylated gag precursor upon transfection of COS-1 cells. Three of these plasmids produced gag precursors that were incorporated into viruslike particles and proteolytically cleaved by the dimers to mature core proteins that were indistinguishable from the processed products of wild-type gag. The amount of viral gag protein that was assembled and packaged in these transfections was inversely related to the relative proteolytic activities of the linked PR dimers. The fourth gag precursor, which contained the most active linked PR dimer, underwent rapid intracellular processing and did not form viruslike particles. In the absence of the plasma membrane targeting signal, processing of all four linked PR dimer-containing gag precursors was completed entirely within the cell. From these results, we conclude that the delay in polyprotein core precursor processing that occurs during normal virion assembly does not depend on a cytoplasmic inhibitor of PR activity. We suggest that dimer formation is not only necessary but may be sufficient for the initiation of PR-directed maturation of gag and gag-pol precursors.
journal_name
J Viroljournal_title
Journal of virologyauthors
Burstein H,Bizub D,Skalka AMdoi
10.1128/JVI.65.11.6165-6172.1991subject
Has Abstractpub_date
1991-11-01 00:00:00pages
6165-72issue
11eissn
0022-538Xissn
1098-5514journal_volume
65pub_type
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.71.7.5227-5235.1997
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abstract::Human immunodeficiency virus (HIV) infections in sub-Saharan Africa represent about 56% of global infections. Study of active-site mutations (the V82A single mutation and the V82F I84V double mutation) in the less-studied South African HIV type 1 subtype C (C-SA) protease indicated that neither mutation had a signific...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00726-08
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.29.3.856-862.1979
更新日期:1979-03-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.57.1.328-334.1986
更新日期:1986-01-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.44.1.12-18.1982
更新日期:1982-10-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.9.6097-6102.1994
更新日期:1994-09-01 00:00:00
abstract::Viruses in the family Coronaviridae, within the order Nidovirales, are etiologic agents of a range of human and animal diseases, including both mild and severe respiratory diseases in humans. These viruses encode conserved replicase and structural proteins as well as more diverse accessory proteins, encoded in the 3' ...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02201-16
更新日期:2017-02-14 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.1.379-389.1994
更新日期:1994-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JVI.72.2.1640-1646.1998
更新日期:1998-02-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02206-07
更新日期:2008-03-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.9.4.664-671.1972
更新日期:1972-04-01 00:00:00
abstract::Human herpesvirus 6 (HHV-6) infects >90% of the population and establishes a latent infection with asymptomatic episodes of reactivation. However, HHV-6 reactivation is associated with morbidity and sometimes mortality in immunocompromised patients. To date, control of the virus in healthy virus carriers and the failu...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02321-18
更新日期:2019-06-14 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.73.10.8303-8307.1999
更新日期:1999-10-01 00:00:00
abstract::A rapid assay for retroviral reverse transcriptase activity released into the culture medium by infected cells was developed. With the assay, 4,000 clonally infected cell lines could be tested in a few hours. We have adapted the assay for use as a screen for the detection of spontaneous viral mutants. Mutants of Molon...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.38.1.239-248.1981
更新日期:1981-04-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.2.1258-1263.1994
更新日期:1994-02-01 00:00:00
abstract::Influenza virus has a set of ribonucleoproteins (RNPs) consisting of viral RNAs, influenza virus polymerase subunits, and nucleoprotein. Intracellular reconstitution of the whole set of RNPs via plasmid transfection results in the generation of influenza virus. By the use of reverse genetics and dual promoters, we con...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00781-09
更新日期:2009-09-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.01926-07
更新日期:2008-02-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.64.10.5173-5176.1990
更新日期:1990-10-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.41.3.901-908.1982
更新日期:1982-03-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.45.1.332-342.1983
更新日期:1983-01-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.01571-15
更新日期:2015-11-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.71.6.4319-4330.1997
更新日期:1997-06-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02435-12
更新日期:2012-12-01 00:00:00
abstract::Expression of the hepatitis B virus core antigen (HBcAg) in mouse NIH 3T3 fibroblasts has been shown previously (A. McLachlan et al., J. Virol. 61:683-692, 1987) to result in the nuclear localization of this polypeptide. Since the carboxyl terminus of HBcAg contains four clusters of arginine residues which resemble nu...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.65.2.575-582.1991
更新日期:1991-02-01 00:00:00
abstract::Varicella-zoster virus (VZV) is a highly species-specific herpesvirus that targets sensory ganglionic neurons. This species specificity has limited the study of many aspects of VZV pathogenesis, including neuronal infection. We report development of a highly efficient neuroblastoma cell model to study productive VZV i...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00515-11
更新日期:2011-08-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.73.6.4705-4712.1999
更新日期:1999-06-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.43.1.104-112.1982
更新日期:1982-07-01 00:00:00
abstract:UNLABELLED:The latent infection of Epstein-Barr virus (EBV) is associated with 1% of human cancer incidence. Poly(ADP-ribosyl)ation (PARylation) is a posttranslational modification catalyzed by poly(ADP-ribose) polymerases (PARPs) that mediate EBV replication during latency. In this study, we detail the mechanisms that...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.01180-16
更新日期:2016-09-12 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.6.5093-5098.1998
更新日期:1998-06-01 00:00:00
abstract::Two live attenuated single-deletion mutant simian immunodeficiency virus (SIV) constructs, SIV239Deltanef and SIVPBj6.6Deltanef, were tested for their abilities to stimulate protective immunity in macaques. During the immunization period the animals were examined for specific immune responses and virus growth. Each co...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.73.2.1262-1270.1999
更新日期:1999-02-01 00:00:00