The cell membrane is a uniquely complex and dynamic chemical environment. Even a simplistic binary description of an individual lipid molecule as hydrophobic tail and hydrophilic headgroup segments makes for a profoundly intricate environment considering the supramolecular ensemble of many such molecules that make up the membrane bilayer. Added to that are at least two facts that increase the chemical complexity of this environment - i) the cellular lipidome comprises of hundreds of lipid molecules whose spatiotemporal distribution is not static; ii) the membrane bilayer is juxtaposed adjacent to a rich aqueous phase with ions, small molecules and macromolecules ranging from small peptides to large proteins. Clearly, membrane proteins that have evolved to function in this milieu, have very different chemical properties and are governed by radically different constraints than soluble proteins. We as a lab are interested in the structural and chemical biology of membrane proteins. We are interested in obtaining detailed structural descriptions of membrane proteins and in understanding the connection between their structural chemistry and their biological function. Towards this end, we will combine x-ray crystallography, protein and peptide chemistry, and solution biochemical and biophysical techniques with detergent-solubilized proteins and reconstituted proteoliposomes. We are currently pursuing studies on interactions of K+ channels with components of animal venom; transporters that move small chemical entities across the membrane and membrane-embedded enzymes.