Tat stimulates gene expression by increasing the ability of RNA polymerase II to efficiently undergo transcriptional elongation. Recent studies suggest that tat can bind a cellular kinase that phosphorylates the C-terminal domain (CTD) of RNA polymerase II. The investigator has purified the kinase complex and demonstrated that it contains novel components as well as previously characterized components of the multi-protein transcription factor, TF II H. Wildtype, but not mutant tat proteins, greatly enhance the ability of the kinase complex to phosphorylate the RNA polymerase II CTD and addition of the kinase to in vitro transcription assays with the HIV-1 LTR markedly stimulated tat activation, suggesting that tat-associated kinase complex is a critical cellular factor involved in tat activation of HIV-1. The investigator proposes to examine the mechanism by which tat association with a kinase complex increases HIV-1 gene expression.
Specific aims i nclude: Determine which cellular components of the kinase complex are able to directly associate with tat. Assay the function of novel components of the tat-associated complex using both in vitro and in vivo assays. Determine whether tat facilitates association of the kinase complex with RNA polymerase II and whether tat alters enzymatic activities of TF II H. Develop a reconstituted in vitro transcription system in which tat activation is dependent on the addition of the tat-associated kinase and further to determine the role of this kinase on regulating in vivo HIV-1 gene expression.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI041860-03
Application #
2887562
Study Section
AIDS and Related Research Study Section 3 (ARRC)
Program Officer
Plaeger, Susan F
Project Start
1997-09-01
Project End
2001-08-31
Budget Start
1999-09-01
Budget End
2000-08-31
Support Year
3
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of Texas Sw Medical Center Dallas
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
City
Dallas
State
TX
Country
United States
Zip Code
75390
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Kwak, Youn-Tae; Li, Rui; Becerra, Carlos R et al. (2005) IkappaB kinase alpha regulates subcellular distribution and turnover of cyclin D1 by phosphorylation. J Biol Chem 280:33945-52