The overall goal of the proposed research is to investigate metal binding sites in large RNA molecules and their influence on RNA structure, stability, and dynamics. RNA displays a rich array of cellular functions through complex interactions with other nucleic acids and proteins. RNA-metal interactions are critical to both structure and function, and effective, direct probes of the influence of metal sites on the structural biology of RNA are required. In work carried out under this project, direct measurements of metal-binding in RNA systems will be measured using Mn2+ as an EPR-detectable spectroscopic probe. The influence of both Mg2+ and Mn2+ on metal binding, RNA structure, and thermodynamic parameters will be investigated. Insight into the conformational dynamics of RNA will be sought using site-specific, EPR-active nitroxide spin labels. Taken together, these studies will provide important information about RNA structure and stability as a function of solution conditions, and will provide new tools for the investigation of more elaborate and conformationally dynamic RNA complexes.
Specific aims of the current proposal include:? Investigating the unique 'metal ion core' from the Group I Intron, with a goal of understanding specifically how metal ions contribute to folding and stability in this structural motif.? Determining metal ion affinities and influence of metals on folding and catalysis in the hairpin ribozyme.? Developing methods for site-specific EPR-active spin labels to study dynamics and distances in RNA, with application to metal-dependent folding pathways in the hammerhead and Group I Intron P4-P6 subdomain.? Investigating the influence of metal ions on folding and activity in a U2-U6 RNA model system for the active site of the spliceosome.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Metallobiochemistry Study Section (BMT)
Program Officer
Preusch, Peter C
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Texas A&M University
Schools of Arts and Sciences
College Station
United States
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Ward, W Luke; Plakos, Kory; DeRose, Victoria J (2014) Nucleic acid catalysis: metals, nucleobases, and other cofactors. Chem Rev 114:4318-42
Hostetter, Alethia A; Osborn, Maire F; DeRose, Victoria J (2012) RNA-Pt adducts following cisplatin treatment of Saccharomyces cerevisiae. ACS Chem Biol 7:218-25
Ward, W Luke; Derose, Victoria J (2012) Ground-state coordination of a catalytic metal to the scissile phosphate of a tertiary-stabilized Hammerhead ribozyme. RNA 18:16-23
Chapman, Erich G; DeRose, Victoria J (2012) Site-specific platinum(II) cross-linking in a ribozyme active site. J Am Chem Soc 134:256-62
Chapman, Erich G; Hostetter, Alethia A; Osborn, Maire F et al. (2011) Binding of kinetically inert metal ions to RNA: the case of platinum(II). Met Ions Life Sci 9:347-77
Hostetter, Alethia A; Miranda, Michelle L; DeRose, Victoria J et al. (2011) Ru binding to RNA following treatment with the antimetastatic prodrug NAMI-A in Saccharomyces cerevisiae and in vitro. J Biol Inorg Chem 16:1177-85
Chapman, Erich G; DeRose, Victoria J (2010) Enzymatic processing of platinated RNAs. J Am Chem Soc 132:1946-52
Kim, Nak-Kyoon; Bowman, Michael K; DeRose, Victoria J (2010) Precise mapping of RNA tertiary structure via nanometer distance measurements with double electron-electron resonance spectroscopy. J Am Chem Soc 132:8882-4
Hostetter, Alethia A; Chapman, Erich G; DeRose, Victoria J (2009) Rapid cross-linking of an RNA internal loop by the anticancer drug cisplatin. J Am Chem Soc 131:9250-7
Hunsicker-Wang, Laura; Vogt, Matthew; Derose, Victoria J (2009) EPR methods to study specific metal-ion binding sites in RNA. Methods Enzymol 468:335-67

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