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Our laboratory focuses on the biophysical studies of the structure, dynamics, and mode of action of peptides and proteins that interact with lipid membranes and DNA. One of our major techniques is solid-state NMR because it is uniquely suited to studying systems under physiologically relevant conditions of temperature, pH, and ionic strength. Other techniques include solution NMR, circular dichroism, fluorescence, surface plasmon resonance, and isothermal titration calorimetry. We also perform various biological assays and binding assays to characterize the activity of biomolecules. Characterizing structural and dynamic features of biomolecules is an important step towards establishing structure-dynamic relationships and identifying the principles underlying functional and diseased states of biological systems. Specific systems of interest and themes include: 1) antimicrobial and host defense peptides; 2) membrane-active peptides and membrane permeation; 3) catalytic metallopeptides and DNA cleavage; 4) transmembrane receptors; synergistic effects between immune effector molecules; 5) GPCR activation of immune cells; 6) immune-related diseases, including bacterial infections, chronic inflammation, and cancer.