This project proposes to examine RNA polymerase fidelity, and how this fidelity is modulated by environmental agents and influences the progression of disease and aging. Transcriptions! errors are thought to underlie pathological alterations in cellular function. For instance, faulty transcripts of ubiquitin-B and (Jamyloid precursor protein are detected in neurons and their products accumulate in protein deposits of Alzheimer's and Down's syndrome patients. Accumulation of these products is linked to disease progression, and has been postulated to be implicated in the etiology of the disease. This proposal will probe the accuracy of synthesis by RNA polymerases, and its alteration by environmental exposure to different agents. A comprehensive fidelity assay will be used to determine polymerization error rates over a broad range of sequence contexts and examine the existence of mutational hot spots that might put certain genes at risk. Structure-function studies will address the basis of RNA polymerase errors with the aim of identifying errorprone alleles to analyze the in vivo consequences of low transcription fidelity. This project will provide a detailed characterization of RNA polymerase fidelity and examine how the relationship between environmental exposures and transcription fidelity can modulate susceptibility to certain diseases or the nonpathological process of aging. -Gene transcription is the first step in the synthesis of proteins. This research explores the accuracy of gene transcription, how this accuracy is modulated by the environment and how alterations of this accuracy can be detrimental to the cell. Understanding the connection between the accuracy of gene transcription and environmental exposures is key to assess its influence in the progression of disease and aging.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Transition Award (R00)
Project #
4R00ES015421-02
Application #
7618316
Study Section
Special Emphasis Panel (NSS)
Program Officer
Reinlib, Leslie J
Project Start
2008-07-16
Project End
2011-05-31
Budget Start
2008-07-16
Budget End
2009-05-31
Support Year
2
Fiscal Year
2008
Total Cost
$245,261
Indirect Cost
Name
State University New York Stony Brook
Department
Pharmacology
Type
Schools of Medicine
DUNS #
804878247
City
Stony Brook
State
NY
Country
United States
Zip Code
11794
Mejia, Edison; Burak, Matthew; Alonso, Ana et al. (2014) Structures of the Leishmania infantum polymerase beta. DNA Repair (Amst) 18:1-9
Yakubovskaya, Elena; Guja, Kip E; Eng, Edward T et al. (2014) Organization of the human mitochondrial transcription initiation complex. Nucleic Acids Res 42:4100-12
Jacewicz, Agata; Trzemecka, Anna; Guja, Kip E et al. (2013) A remote palm domain residue of RB69 DNA polymerase is critical for enzyme activity and influences the conformation of the active site. PLoS One 8:e76700
Guja, Kip E; Venkataraman, Krithika; Yakubovskaya, Elena et al. (2013) Structural basis for S-adenosylmethionine binding and methyltransferase activity by mitochondrial transcription factor B1. Nucleic Acids Res 41:7947-59
Guja, Kip E; Garcia-Diaz, Miguel (2012) Hitting the brakes: termination of mitochondrial transcription. Biochim Biophys Acta 1819:939-47
Yakubovskaya, Elena; Guja, Kip E; Mejia, Edison et al. (2012) Structure of the essential MTERF4:NSUN4 protein complex reveals how an MTERF protein collaborates to facilitate rRNA modification. Structure 20:1940-7
Babiychuk, Elena; Vandepoele, Klaas; Wissing, Josef et al. (2011) Plastid gene expression and plant development require a plastidic protein of the mitochondrial transcription termination factor family. Proc Natl Acad Sci U S A 108:6674-9
Byrnes, James; Garcia-Diaz, Miguel (2011) Mitochondrial transcription: how does it end? Transcription 2:32-6
Yakubovskaya, Elena; Mejia, Edison; Byrnes, James et al. (2010) Helix unwinding and base flipping enable human MTERF1 to terminate mitochondrial transcription. Cell 141:982-93