The functions of RNA include coding (for protein, RNA, and DNA), gene regulation, catalysis, and immunomodulation. The overall goal of Gang CHEN research group is to better understand the structures and the physical-chemical properties of RNAs and RNA-ligand complexes to provide deeper insight into and to facilitate precise control of the diverse biological functions involving RNA. The research projects of current interests are: (1) characterizing the molecular recognition interactions (e.g., hydrogen bonding and aromatic base stacking) accounting for structure, stability, and dynamics of RNA structural building blocks such as internal loops, hairpins, triplexes, and pseudoknots, (2) probing the complex energy landscapes of RNA folding and assembly with protein, and (3) designing and discovering therapeutic ligands (small molecules, oligonucleotides, peptides, and peptide nucleic acids) targeting RNA and RNA-protein complex