Abstract

Protein-DNA recognition is central to many biological processes. This interaction can be classified into two major types: sequence-specific and structure-specific. DNA-repair proteins generally do not recognize specific DNA sequences but search for unusual DNA structures which require repair. In addition, the DNA repair process often requires the concerted actions of several proteins. Our understanding of the structural biology of DNA-repair process is still in its infancy. A number of major DNA repair pathways have not been characterized at the molecular level. The mechanism of structure-specific DNA recognition as well as the interactions between proteins in the repair complex is not well understood. In this proposal, we plan to characterize the major pathway for double-strand DNA breaks repair. Double-strand DNA breaks are caused by ionizing radiation, V (D) J recombination and physiological oxidation reactions, and proper repair is important to maintain genomic stability. The proteins that are central to the major pathway of double-strand-break repair process are Ku70 (69.8 kD) and Ku80 (82.7 kD). These two proteins form a tight complex, bind to broken DNA ends and recruit other proteins, including a DNA-dependent protein kinase and a DNA-ligase to form the DNA repair machinery. Previous studies suggest that the Ku proteins contain structurally and functionally independent domains. We will analyze the structures of Ku domains and study the mechanism of the interactions between these domains, and their interactions with DNA and other proteins in the DNA-repair machinery using a combination of nuclear magnetic resonance (NMR) and molecular biological approaches. These studies will provide an understanding, at the molecular level, of the assembly of the proteins at DNA double strand break sites. This information is necessary to improve our knowledge of the molecular mechanism of the Ku-mediated DNA double-strand break repair pathway. This study should also improve our understanding of the structural biology of DNA repair in general.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
1R01CA094595-01
Application #
6368902
Study Section
Physical Biochemistry Study Section (PB)
Program Officer
Pelroy, Richard
Project Start
2001-09-12
Project End
2006-08-31
Budget Start
2001-09-12
Budget End
2002-08-31
Support Year
1
Fiscal Year
2001
Total Cost
$352,078
Indirect Cost

  Institution

Name
City of Hope/Beckman Research Institute
Department
Type
DUNS #
City
Duarte
State
CA
Country
United States
Zip Code
91010

  Publications

Li, Yi-Jia; Du, Li; Wang, Jianghai et al. (2018) Allosteric Inhibition of Ubiquitin-like Modifications by a Class of Inhibitor of SUMO-Activating Enzyme. Cell Chem Biol :
Seu, Candace S; Chen, Yuan (2009) Identification of SUMO-binding motifs by NMR. Methods Mol Biol 497:121-38
Cao, Xuefei; Clavijo, Carlos; Li, Xu et al. (2008) SUMOylation of HMGA2: selective destabilization of promyelocytic leukemia protein via proteasome. Mol Cancer Ther 7:923-34
Tan, Joseph-Anthony T; Sun, Yujie; Song, Jing et al. (2008) SUMO conjugation to the matrix attachment region-binding protein, special AT-rich sequence-binding protein-1 (SATB1), targets SATB1 to promyelocytic nuclear bodies where it undergoes caspase cleavage. J Biol Chem 283:18124-34
Rouleau, Nathalie; Wang, Jianghai; Karras, Labrini et al. (2008) Highly sensitive assays for SUMOylation and small ubiquitin-like modifier-dependent protein-protein interactions. Anal Biochem 375:364-6
Wang, Jianghai; Hu, Weidong; Cai, Sheng et al. (2007) The intrinsic affinity between E2 and the Cys domain of E1 in ubiquitin-like modifications. Mol Cell 27:228-37
Nguyen, Ha-Van; Chen, Jo-Lin; Zhong, Jenny et al. (2006) SUMOylation attenuates sensitivity toward hypoxia- or desferroxamine-induced injury by modulating adaptive responses in salivary epithelial cells. Am J Pathol 168:1452-63
Cai, Sheng; Seu, Candace; Kovacs, Zoltan et al. (2006) Sensitivity enhancement of multidimensional NMR experiments by paramagnetic relaxation effects. J Am Chem Soc 128:13474-8
Tatham, Michael H; Kim, Suhkmann; Jaffray, Ellis et al. (2005) Unique binding interactions among Ubc9, SUMO and RanBP2 reveal a mechanism for SUMO paralog selection. Nat Struct Mol Biol 12:67-74
Song, Jing; Zhang, Ziming; Hu, Weidong et al. (2005) Small ubiquitin-like modifier (SUMO) recognition of a SUMO binding motif: a reversal of the bound orientation. J Biol Chem 280:40122-9

Showing the most recent 10 out of 13 publications