Dr. Doublié received her Ph.D. in Biochemistry and Biophysics in 1993 under the direction of Charles W. Carter at the University of North Carolina at Chapel Hill. She did postdoctoral work with Stephen Cusack at the EMBL outstation in Grenoble and with Tom Ellenberger at Harvard Medical School where she solved the crystal structure of the ternary complex of T7 DNA polymerase. She joined the UVM faculty in October 1998.
Modifications in DNA or RNA, as part of normal cellular processes or as aberrations, can have profound biological consequences. The major thrust of my research program is to study these nucleic acid modifications in the context of the enzymes and proteins that generate and recognize them.
DNA polymerases, which otherwise faithfully replicate DNA, stumble when they encounter oxidative DNA lesions. Polymerases either will be blocked at the site of lesion, or bypass it. The latter case, referred to as translesion synthesis, may initiate an oncogenic process if the wrong base is inserted opposite the lesion. Uncovering the fundamental mechanisms underpinning translesion synthesis is paramount to understand the initial events of mutagenesis. We aim to elucidate at the atomic level the factors that influence the interactions between a replicative polymerase and DNA lesions. Our goal is to answer the following questions: How does a DNA polymerase sense the presence of a DNA lesion? What role does sequence context play in translesion synthesis? What triggers the transfer of DNA to the editing site in the event of a base mispair ?
Several DNA repair mechanisms are in place to minimize damage in DNA before DNA polymerases replicate the genome. One of these processes is called Base Excision Repair (BER). The first step in BER is carried out by DNA glycosylases, so named because they hydrolyze the N-glycosidic bond between a damaged base and its deoxyribose, leaving an apurinic or apyrimidinic site in DNA. The goal of this project is to delineate the structural features of the DNA glycosylases that are involved in recognition of DNA base damage produced by ionizing radiation. In particular, we intend to address the question of how enzymes with a similar active site architecture are able to recognize vastly different substrates.
Messenger RNA (mRNA) also undergoes modifications, this time as an essential step of the normal cell program. During processing of the 3'-end of mRNA, a specific endonucleolytic cleavage event precedes the addition of a poly(A) tail. Such maturation of 3'-ends is a key regulatory step in the expression of many genes. The cleavage and polyadenylation reactions are carried out by a multicomponent machinery of remarkable complexity. Our goal is to understand how the different components of the machinery interact to cleave then polyadenylate messenger RNAs.
Imamura K., Wallace SS and Doublié S. Structural characterization of a viral NEIL1 ortholog unliganded and bound to abasic site-containing DNA. J Biol Chem. 2009 Jul 22. [Epub ahead of print]
View the structure at PDB.
Faucher F, Duclos S, Bandaru V, Wallace SS and Doublié S. Crystal structures of two archaeal 8-oxoguanine DNA glycosylases provide structural insight into guanine/8-oxoguanine distinction. Structure. 2009 May 13;17(5):703-12.
View the structure at PDB.
Faucher F, Robey-Bond SM, Wallace SS and Doublié S. Structural characterization of Clostridium acetobutylicum 8-oxoguanine DNA glycosylase in its apo form and in complex with 8-oxodeoxyguanosine. J Mol Biol. 2009 Apr 3;387(3):669-79. Epub 2009 Feb 9.
View the structure at PDB.
Aller P, Ye Y, Wallace SS, J Burrows C, Doublié S.Crystal Structure of a Replicative DNA Polymerase Bound to the Oxidized Guanine Lesion Guanidinohydantoin. Biochemistry. 2010 Feb 25. [Epub ahead of print]
Faucher F, Wallace SS, Doublié S. The C-terminal Lysine of Ogg2 DNA Glycosylases is a Major Molecular Determinant for Guanine/8-Oxoguanine Distinction. J Mol Biol. 2010 Mar 19;397(1):46-56.
Yang Q, Gilmartin GM, Doublié S. Structural basis of UGUA recognition by the Nudix protein CFI(m)25 and implications for a regulatory role in mRNA 3' processing. Proc Natl Acad Sci U S A. 2010 Jun 1;107(22):10062-7.
* indicates equal contribution
Pew Scholar in the Biomedical Sciences The Pew Scholars Program in the Biomedical Sciences is designed to support young investigators of outstanding promise in the basic and clinical sciences relevant to the advancement of human health. The funding of the awards is provided by The Pew Charitable Trusts. The award is intended to provide assured support, during their earlier years, for junior members of the faculty as they establish their laboratories. It is hoped that the assurance provided through the Program will encourage successful applicants to be more venturesome in their research and future applications for support than would otherwise be likely.
J. Walter Juckett Award Each year, VCC\'s long-time partner—the Lake Champlain Cancer Research Organization (LCCRO)—generously makes funding available for cancer research and academic awards to UVM faculty in several categories. The J. Walter Juckett Scholar Award is one such award. Historically, this award has laid the foundation for larger, NIH-funded grants.
This two-year grant is awarded every other year to an investigator who has a demonstrated record of sustained productivity in cancer research.
The J. Walter Juckett Scholar Award provides $75,000 over a two-year period. The award is non-renewable, and may not be used to support tenure track faculty salary. (2001-2002)
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