Abstract:
:Arginine methylation of human immunodeficiency virus type 1 (HIV-1) Tat protein downregulates its key function in viral-gene transactivation. The fate of methylated Tat is unknown, so it is unclear whether methylated Tat is degraded or persists in the cell for additional functions. Here we show that the arginine methyltransferase PRMT6 increases Tat protein half-life by 4.7-fold. Tat stabilization depends on the catalytic activity of PRMT6 and requires arginine methylation within the Tat basic domain. In contrast, HIV-1 Rev, which is also methylated by PRMT6, is completely refractory to the stabilizing effect. Proteasome inhibition and silencing experiments demonstrated that Tat can be degraded by a REGgamma-independent proteasome, against which PRMT6 appears to act to increase Tat half-life. Our data reveal a proteasome-dependent Tat degradation pathway that is inhibited by arginine methylation. The stabilizing action of PRMT6 could allow Tat to persist within the cell and the extracellular environment and thereby enable functions implicated in AIDS-related cancer, neurodegeneration, and T-cell death.
journal_name
J Viroljournal_title
Journal of virologyauthors
Sivakumaran H,van der Horst A,Fulcher AJ,Apolloni A,Lin MH,Jans DA,Harrich Ddoi
10.1128/JVI.00499-09subject
Has Abstractpub_date
2009-11-01 00:00:00pages
11694-703issue
22eissn
0022-538Xissn
1098-5514pii
JVI.00499-09journal_volume
83pub_type
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