Abstract
X-ray diffraction data recorded for monovalent and divalent cation complexes of a series of phosphatidylserines (PS) varying in chain length reveal a simple structural pattern. Only two bilayer structural types differing in hydrocarbon chain tilt but with similar polar group conformations are observed for (i) anhydrous acidic PS, (ii) anhydrous K +-PS, and (iii) Li +, Mg 2+, Ca 2+, Sr 2+, Ba 2+, and Pr 3+ complexes of “hydrated” PS. The X-ray diffraction data suggest that PS becomes dehydrated on complexing with Li +, Mg 2+, Ca 2+, and other divalent cations and adopts either the chain untilted (form I) or tilted (form II) bilayer structure.
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