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- W1983377063 abstract "Abstract The lipase from Rhizopus arrhizus has been used to determine the transmembrane distribution of monogalactosyldiacylglycerol (MGDG) and digalactosyldiacylglycerol (DGDG) in spinach thylakoid membranes. The hydrolysis kinetics, expressed as semilog plots, were carried out at constant bulk pH under a wide range of salt concentration and temperatures. DGDG always showed two pools of constant amplitude, regardless of the conditions used. The behavior of MGDG was more complex. Depending on environmental conditions, two or three pools could be evidenced. We have developed a simple rationale which allows to distinguish between kinetic pools (identified as different populations of lipid molecules being degraded at different hydrolysis rates within the outer monolayer) and topological pools (corresponding to the classical outside/inside distribution). It is suggested that the surface potential and temperature are involved in the control of the packing pressure of thylakoid membrane lipids, as probed by the lipolytic enzyme. We defined a limited set of conditions under which it is possible to obtain reliable estimations of the transversal distribution of galactolipids in thylakoid membranes. For spinach, the outside/inside ratios are 15 85 for DGDG and 65 35 for MGDG. Taking into account the contribution (in mol%) of these lipids to the total acyl lipid composition, it is deduced that total galactolipids are equally distributed within the two monolayers of the thylakoid membrane. The implications of these results for the overall molecular organization of the thylakoid membrane will be discussed." @default.
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- W1983377063 date "1985-05-01" @default.
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- W1983377063 title "Transversal localization of monogalactosyldiacylglycerol and digalactosyldiacylglycerol in spinach thylakoid membranes" @default.
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- W1983377063 doi "https://doi.org/10.1016/0005-2736(85)90299-8" @default.
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