Current topics in bioenergetics. V.14, 1985 by C. P. Lee

By C. P. Lee

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A s with hexane and dioleyl lecithin multilayers, ethanol (deuterated vs protonated) has been equilibrated with sarcoplasmic reticulum membrane multilayers in the vapor phase (Napolitano and Herbette, 1984). The more polar properties of ethanol, in contrast to the other small molecules de­ scribed above, resulted in a greater interaction of ethanol with the water layers hydrating the membrane compared with the membrane bilayer hy­ drocarbon core. A s a final example, neutron diffraction can be used to determine where calcium binds to both model and biological membranes.

The results of these model calculations are given in Table I. , the ratio of protein to small molecule is 1). 28 LEO G. HERBETTE molecule is based on the average size of molecules for this molecular weight, allowing for some "smearing" of the small molecule along the profile structure axis (z). The following scattering amplitude densities for the various membrane components were used. 5 The scattering amplitude densities for the small molecule were calculated based on a molecular weight of 163 for the deuterated derivative, corresponding to a molecular volume of approximately 190 A3, and for the protonated derivative with molecular weight of 147 and molecular volume of 170 A3.

H E R B E T T E specifically to some of the phospholipid head groups of the membrane bilayer. Under these conditions 2 mol calcium were bound per mole of calcium pump protein (or 1 mol calcium per 50 mol lipid). These highaffinity sites for calcium in the sarcoplasmic reticulum membrane may be in close proximity to one another (Highsmith, 1984) so that, to a first approximation, they may be confined to a small extent along the profile axis of the sarcoplasmic reticulum membrane and be taken to represent a single site.

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