The overall goal of this research project is to elucidate in molecular detail the function and regulation of retinoblastoma (Rb) pocket proteins. Rb and its homologs p107 and p130 are key cell- cycle control proteins that are disrupted in many cancers. A molecular picture of pocket protein function is therefore important for understanding mechanisms of tumorigenesis and for designing cancer chemotherapeutics. Pocket proteins bind E2F transcription factors and other regulatory proteins on chromatin to control cell-cycle gene expression. Cyclin-dependent kinase (Cdk) phosphorylation inactivates pocket proteins by disrupting these complexes. This proposal aims to determine the structures of pocket proteins and their complexes with functional protein partners. The structural insights will be applied to understand how pocket protein interactions are specific and how they are modulated by multisite Cdk phosphorylation. It is anticipated that these studies will provide fundamental new concepts for understanding mechanisms of tumorigenesis and strategies for treating cancers that result from deregulated cell-cycle control mechanisms.

Public Health Relevance

Tumor cells invariably have defects in the biochemical mechanisms that regulate cell growth and division, so understanding how these processes work is vital to understanding cancer. This project aims to develop a molecular picture of how a family of cell-cycle regulators known as the retinoblastoma pocket proteins function.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA132685-07
Application #
8668907
Study Section
Macromolecular Structure and Function C Study Section (MSFC)
Program Officer
Knowlton, John R
Project Start
2008-04-01
Project End
2018-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
7
Fiscal Year
2014
Total Cost
$282,909
Indirect Cost
$87,672
Name
University of California Santa Cruz
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
125084723
City
Santa Cruz
State
CA
Country
United States
Zip Code
95064
Guiley, Keelan Z; Iness, Audra N; Saini, Siddharth et al. (2018) Structural mechanism of Myb-MuvB assembly. Proc Natl Acad Sci U S A 115:10016-10021
Iness, Audra N; Felthousen, Jessica; Ananthapadmanabhan, Varsha et al. (2018) The cell cycle regulatory DREAM complex is disrupted by high expression of oncogenic B-Myb. Oncogene :
Liban, Tyler J; Medina, Edgar M; Tripathi, Sarvind et al. (2017) Conservation and divergence of C-terminal domain structure in the retinoblastoma protein family. Proc Natl Acad Sci U S A 114:4942-4947
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Ishak, Charles A; Marshall, Aren E; Passos, Daniel T et al. (2016) An RB-EZH2 Complex Mediates Silencing of Repetitive DNA Sequences. Mol Cell 64:1074-1087
Pye, Cameron R; Bray, Walter M; Brown, Elise R et al. (2016) A Strategy for Direct Chemical Activation of the Retinoblastoma Protein. ACS Chem Biol 11:1192-7
Liban, Tyler J; Thwaites, Michael J; Dick, Frederick A et al. (2016) Structural Conservation and E2F Binding Specificity within the Retinoblastoma Pocket Protein Family. J Mol Biol 428:3960-3971
Guiley, Keelan Z; Liban, Tyler J; Felthousen, Jessica G et al. (2015) Structural mechanisms of DREAM complex assembly and regulation. Genes Dev 29:961-74
Burke, Jason R; Liban, Tyler J; Restrepo, Tamara et al. (2014) Multiple mechanisms for E2F binding inhibition by phosphorylation of the retinoblastoma protein C-terminal domain. J Mol Biol 426:245-55

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