The human T-cell leukemia virus, type I, is causally linked to a fatal lymphoproliferative disease called adult T-cell leukemia (ATL). The virally-encoded Tax protein appears directly responsible for the creation of an intracellular environment that is permissive to malignant transformation. Tax is critical to the viral life cycle, as it activates HTLV-I transcription following the assembly of multiprotein complexes in the transcriptional control region of the virus. Recent evidence indicates that the Tax-containing promoter complex is responsible for recruitment of the cellular coactivators, CBP/p300, with the subsequent strong activation of viral transcription. CBP and p300 are highly related proteins that belong to a novel class of transcriptional activators that possess histone acetyltransferase (HAT) activity, and appear to play a significant role in gene-specific activation though modulation of chromatin structure. CBP and p300 are both highly pleiotropic proteins that function in virtually all known cellular programs, including development, differentiation, and cell death. Because of their central role in fundamental biological processes, dysregulation of these proteins has been strongly correlated with human disease, including hematologic malignancies. Based on these observations, we hypothesize that the strong Tax dependence on CBP/p300 underlies HTLV-I associated neoplastic transformation of the infected T-cell. Currently, very little is known about the molecular mechanisms of CBP/p300 transcription function. In this application, we propose to investigate the role of CBP/p300 in Tax-mediated transcriptional activation in vitro. We have selected this system, as the Tax-CBP/p300 interaction is among the best characterized of the coactivator-transcription factor interactions to date. We plan to explore CBP-mediated Tax transcriptional activation using chromatin-assembled templates in vitro. Our methods will allow biochemical dissection of the TaxCBP/p300 interactions, and enable evaluation of putative nucleosome and transcription factor modifications that accompany transcriptional activation. Outcomes of the proposed studies may reveal basic aspects of Tax and CBP/p300 function as they pertain to gene regulation, chromatin structure, and leukemogenesis.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA087540-02
Application #
6514661
Study Section
Virology Study Section (VR)
Program Officer
Cole, John S
Project Start
2001-03-01
Project End
2006-02-28
Budget Start
2002-03-01
Budget End
2003-02-28
Support Year
2
Fiscal Year
2002
Total Cost
$277,216
Indirect Cost
Name
Colorado State University-Fort Collins
Department
Biochemistry
Type
Schools of Arts and Sciences
DUNS #
112617480
City
Fort Collins
State
CO
Country
United States
Zip Code
80523
Konesky, Kasey L; Laybourn, Paul J (2007) Biochemical analyses of transcriptional regulatory mechanisms in a chromatin context. Methods 41:259-70
Konesky, Kasey L; Nyborg, Jennifer K; Laybourn, Paul J (2006) Tax abolishes histone H1 repression of p300 acetyltransferase activity at the human T-cell leukemia virus type 1 promoter. J Virol 80:10542-53
Lemasson, Isabelle; Polakowski, Nicholas J; Laybourn, Paul J et al. (2006) Tax-dependent displacement of nucleosomes during transcriptional activation of human T-cell leukemia virus type 1. J Biol Chem 281:13075-82
Lemasson, Isabelle; Polakowski, Nicholas J; Laybourn, Paul J et al. (2004) Transcription regulatory complexes bind the human T-cell leukemia virus 5' and 3' long terminal repeats to control gene expression. Mol Cell Biol 24:6117-26
Georges, Sara A; Giebler, Holli A; Cole, Philip A et al. (2003) Tax recruitment of CBP/p300, via the KIX domain, reveals a potent requirement for acetyltransferase activity that is chromatin dependent and histone tail independent. Mol Cell Biol 23:3392-404
Lemasson, Isabelle; Polakowski, Nicholas J; Laybourn, Paul J et al. (2002) Transcription factor binding and histone modifications on the integrated proviral promoter in human T-cell leukemia virus-I-infected T-cells. J Biol Chem 277:49459-65
Georges, Sara A; Kraus, W Lee; Luger, Karolin et al. (2002) p300-mediated tax transactivation from recombinant chromatin: histone tail deletion mimics coactivator function. Mol Cell Biol 22:127-37