Fourier transform infrared (FTIR) and circular dichroism (CD) spectroscopies are fast techniques providing important information about the conformation of nucleic acids and proteins. These vibrational and electronic absorption spectroscopies are extremely sensitive to any change in molecular structure. While numerous reviews describe how to analyze DNA structure alone or in the presence of proteins using FTIR and CD, analyses of RNA are scarce. Nevertheless, RNA remodeling proteins are important factors involved in a multitude of roles in the cell. In this chapter, we present applications of synchrotron radiation circular dichroism (SRCD) and FTIR to analyze how proteins may change RNA structure. These include the analysis of RNA melting, or stabilization, of change in helical parameters and base stacking. The effects on the structure of RNA remodeling proteins are also presented.
Keywords: Chiro-optical spectroscopy, Vibrational spectroscopy, RNA and protein secondary structure; Helical properties; Nucleoprotein complex; Sugar puckering.