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Materials with Negative Compressibilities

Ray H. Baughman et al. studied materials with the seemingly paradoxical property of negative compressibility in one or more dimensions (1). The biological literature is just beginning to recognize that this phenomenon might be occurring when proteins and other biologically important species are subjected to pressure. A recent study by Clery et al. (2) showed that butyryl cholinesterase went from a native-like structure to a molten globule-like structure when the protein was subjected to pressure (P). This intermediate, on the way to unfolding, has a larger volume than does the native structure. The data, obtained by polyacrylamide gel electrophoresis under P, reveal that the hydrated radius of the molten globule is greater than that of the native enzyme.