Structure/Function Analysis of DNA-glycosylases That Repair Oxidized Purines and Pyrimidines and the Influence of Surrounding DNA Sequence on Their Interactions

Wallace, Susan S.

University of Vermont, Burlington, VT 05405

关键词: Repair;    Dna Damages;    Dna;    Pyrimidines;    Enzymes;   

DOI  :  10.2172/900301
RP-ID  :  DOE/ER/45723-1
RP-ID  :  FG02-98ER45723
RP-ID  :  900301

美国|英语

来源: UNT Digital Library

【 摘 要 】

The overall goal of this project was to elucidate the structure/function relationships between oxidized DNA bases and the DNA repair enzymes that recognize and remove them. The NMR solution structure of formamidopyrimidine DNA glycosylase (Fpg) that recognizes oxidized DNA purines was to be determined. Furthermore, the solution structures of DNA molecules containing specific lesions recognized by Fpg was to be determined in sequence contexts that either facilitate or hinder this recognition. These objectives were in keeping with the long-term goals of the Principal Investigator's laboratory, that is, to understand the basic mechanisms that underpin base excision repair processing of oxidative DNA lesions and to elucidate the interactions of unrepaired lesions with DNA polymerases. The results of these two DNA transactions can ultimately determine the fate of the cell. These objectives were also in keeping with the goals of our collaborator, Dr. Michael Kennedy, who is studying the repair and recognition of damaged DNA. Overall the goals of this project were congruent with those of the Department of Energy's Health Effects and Life Sciences Research Program, especially to the Structural Biology, the Human Genome and the Health Effects Programs. The mission of the latter Program includes understanding the biological effects and consequences of DNA damages produced by toxic agents in the many DOE waste sites so that cleanup can be accomplished in a safe, effective and timely manner.