Structure and elasticity of lipid membranes with genistein and daidzein bioflavinoids using X-ray scattering and MD simulations. Mohit Raghunathan Yuriy Zubovski Richard M. Venable Richard W. Pastor John F. Nagle Stephanie Tristram-Nagle 10.1184/R1/6508151.v1 https://kilthub.cmu.edu/articles/journal_contribution/Structure_and_elasticity_of_lipid_membranes_with_genistein_and_daidzein_bioflavinoids_using_X-ray_scattering_and_MD_simulations_/6508151 <p>This work reports the effects of the bioflavinoids genistein and daidzein on lipid bilayers as determined by volume measurements, X-ray scattering, and molecular dynamics simulations. The experimental and simulated total molecular volumes were found to be in outstanding agreement with each other before the addition of genistein and daidzein and also after their addition. Both bioflavinoids inserted into the hydrocarbon region of both DOPC and diphytanoylPC near the carbonyls of the lipids and both decreased the bilayer thicknesses. The long axes of both bioflavinoids were oriented nearly parallel to the plane of the bilayer with their carbonyl groups preferentially pointed toward the proximal surface. A difference is that daidzein had a solubility limit of ∼0.14 mol fraction in DOPC (∼0.12 mol fraction in diphytanoylPC), whereas genistein was soluble at least to 0.20 mol fraction in both lipid membranes. Measurements of bending modulus K(C) and simulation results for area compressibility modulus K(A) indicate that both bioflavinoids soften bilayers.</p> 2012-04-05 00:00:00 Crystallography X-Ray Elasticity Genistein Isoflavones Lipid Bilayers Models Molecular Molecular Dynamics Simulation Molecular Structure Phosphatidylcholines