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The circular dichroism bands of (+) gossypol in the spectral region 300-400 nm have been shown to be sensitive to interactions with proteins. Using CD spectroscopy, gossypol has been shown to interact with lactate dehydrogenase, malate dehydrogenase, alkaline phosphatase, lysozyme, protamine and poly-L-lysine. Binding to proteins generally results in a pronounced red shift of the long wavelength CD band (approximately 380-430 nm) accompanied by a reduction in ellipticity. The changes in spectral parameters of the 1Lb binaphthyl transition may reflect a distortion from a nearly perpendicular gossypol conformation, on binding to proteins.
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