Helicases are molecular motor proteins that couple the hydrolysis of nucleoside triphosphate to nucleic acid unwinding. Enzymes of this class function coordinately with other proteins as a complex machine and play essential roles in pathways of DNA metabolism that include replication, DNA repair, recombination, transcription, and chromosome segregation. Despite considerable efforts to understand biochemical, structural, and genetic aspects of helicase function, the precise mechanisms by which helicases catalyze strand separation and perform their biological roles remain to be fully understood. The growing number of DNA helicases implicated in human disease suggests that these enzymes have vital specialized roles in cellular pathways important for the maintenance of genome stability. ? Recent evidence indicates that mutations in genes of the RecQ family of DNA helicases result in chromosomal instability diseases of premature aging and/or cancer predisposition. Currently known RecQ helicase-deficient disorders include Werner, Bloom, and Rothmund-Thomson syndromes. The WRN gene product, defective in Werner syndrome, is a helicase/exonuclease that presumably functions in DNA metabolism to preserve genome integrity. To understand the DNA structures and cellular pathways that WRN impacts, we have systematically examined the DNA substrate preferences of WRN helicase for unwinding and its interactions with human nuclear proteins. Our biochemical studies indicate that WRN preferentially unwinds DNA replication structures in a defined orientation and utilizes specific DNA structural elements for recognition. A real-time kinetic analysis of WRN helicase activity was used by our group to characterize the mechanism of DNA unwinding by WRN. Biochemical studies were performed to investigate the mechanism for stimulation of WRN helicase activity by its auxiliary factor RPA. Our results indicate that the physical interaction between RPA and WRN plays a critical role in the functional interaction. To further understand the molecular functions of WRN protein, we have characterized the functional interaction of WRN with human Flap Endonuclease 1 (FEN-1), a structure-specific nuclease implicated in DNA repair, replication, and recombination. Our results indicate that WRN stimulates FEN-1 cleavage of important DNA intermediates by a unique mechanism whereby the efficiency of FEN-1 cleavage is dramatically enhanced. Our most recent work has elucidated a role for WRN in resolving stalled replication forks and recombination intermediates. Our hypothesis is that the aberrant mitotic recombination and genomic instability arises from inappropriate processing of replication/recombination intermediates in Werner syndrome cells. In vivo evidence for a role of WRN in cellular DNA replication was attained using a model genetic system for WRN structure-function studies.? Although the biochemical properties and protein interactions of the WRN and BLM helicases have been extensively investigated, less information is available concerning the functions of the other human RecQ helicases. We have focused our attention on human RECQ1, a DNA helicase whose cellular functions remain largely uncharacterized. RECQ1 was found to stably bind a variety of DNA structures, enabling it to unwind a diverse set of DNA substrates. RECQ1 was shown to catalyze efficient strand annealing between complementary single-stranded DNA molecules. To acquire a better understanding of RECQ1 cellular functions, we have investigated its protein interactions. Our results suggest a role of RECQ1 in regulation of genetic recombination by its interaction with mismatch repair factors. Currently, we are utilizing model systems to determine the biological functions of RECQ1.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Intramural Research (Z01)
Project #
1Z01AG000741-08
Application #
7732305
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
8
Fiscal Year
2008
Total Cost
$227,837
Indirect Cost
Name
National Institute on Aging
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Wu, Yuliang; Rawtani, Nina; Thazhathveetil, Arun Kalliat et al. (2008) Human replication protein A melts a DNA triple helix structure in a potent and specific manner. Biochemistry 47:5068-77
Sharma, Sudha; Brosh Jr, Robert M (2007) Human RECQ1 is a DNA damage responsive protein required for genotoxic stress resistance and suppression of sister chromatid exchanges. PLoS ONE 2:e1297
Gupta, Rigu; Brosh Jr, Robert M (2007) DNA repair helicases as targets for anti-cancer therapy. Curr Med Chem 14:503-17
Brosh Jr, Robert M; Bohr, Vilhelm A (2007) Human premature aging, DNA repair and RecQ helicases. Nucleic Acids Res 35:7527-44
Sharma, Sudha; Stumpo, Deborah J; Balajee, Adayabalam S et al. (2007) RECQL, a member of the RecQ family of DNA helicases, suppresses chromosomal instability. Mol Cell Biol 27:1784-94
Muftuoglu, Meltem; Sharma, Sudha; Thorslund, Tina et al. (2006) Cockayne syndrome group B protein has novel strand annealing and exchange activities. Nucleic Acids Res 34:295-304
Brosh Jr, Robert M; Opresko, Patricia L; Bohr, Vilhelm A (2006) Enzymatic mechanism of the WRN helicase/nuclease. Methods Enzymol 409:52-85
Brosh Jr, Robert M; Sharma, Sudha (2006) Biochemical assays for the characterization of DNA helicases. Methods Mol Biol 314:397-415
Choudhary, Saba; Doherty, Kevin M; Handy, Christopher J et al. (2006) Inhibition of Werner syndrome helicase activity by benzo[a]pyrene diol epoxide adducts can be overcome by replication protein A. J Biol Chem 281:6000-9
Gupta, Rigu; Sharma, Sudha; Doherty, Kevin M et al. (2006) Inhibition of BACH1 (FANCJ) helicase by backbone discontinuity is overcome by increased motor ATPase or length of loading strand. Nucleic Acids Res 34:6673-83

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