Abstract:
:Simian virus 40 (SV40) large T antigen (SVT) interferes with normal cell regulation and thus has been used to identify cellular components controlling proliferation and homeostasis. We have previously shown that SVT-mediated transformation requires interaction with the histone acetyltransferases (HATs) CBP/p300 and now report that the ectopic expression of SVT in several cell types in vivo and in vitro results in a significant increase in the steady-state levels of CBP/p300. Furthermore, SVT-expressing cells contain higher levels of acetylated CBP/p300, a modification that has been linked to increased HAT activity. Concomitantly, the acetylation levels of histone residues H3K56 and H4K12 are markedly increased in SVT-expressing cells. Other polyomavirus-encoded large T antigens also increase the levels of CBP/p300 and sustain a rise in the acetylation levels of H3K56 and H4K12. SVT does not affect the transcription of CBP/p300, but rather, alters their overall levels through increasing the loading of CBP/p300 mRNAs onto polysomes. Two distinct regions within SVT, one located in the amino terminus and one in the carboxy terminus, can independently alter both the levels of CBP/p300 and the loading of CBP/p300 transcripts onto polysomes. Within the amino-terminal fragment, a functional J domain is necessary for increasing CBP/p300 and specific histone acetylation levels, as well as for immortalizing primary cells. These studies uncover the action of polyomavirus T antigens on cellular CBP/p300 and suggest that additional mechanisms are used by T antigens to induce cell immortalization and transformation.
journal_name
J Viroljournal_title
Journal of virologyauthors
Sáenz Robles MT,Shivalila C,Wano J,Sorrells S,Roos A,Pipas JMdoi
10.1128/JVI.02658-13subject
Has Abstractpub_date
2013-12-01 00:00:00pages
13499-509issue
24eissn
0022-538Xissn
1098-5514pii
JVI.02658-13journal_volume
87pub_type
杂志文章abstract::Analysis of the complete sequence of a human immunodeficiency virus (HIV) isolate (Ant70) obtained from a Cameroonian patient indicates that this virus is the most divergent strain within the HIV-1 family hitherto described. Comparison of the Pol protein, usually highly conserved within the HIV-1 family, shows only ab...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.3.1586-1596.1994
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1128/JVI.75.1.303-310.2001
更新日期:2001-01-01 00:00:00
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pub_type: 杂志文章
doi:10.1128/JVI.69.6.3824-3830.1995
更新日期:1995-06-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02675-09
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00317-09
更新日期:2009-09-01 00:00:00
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doi:10.1128/JVI.53.1.296-298.1985
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.62.5.1753-1761.1988
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journal_title:Journal of virology
pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2006-11-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.71.12.9134-9142.1997
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