Freezing of Isolated Thylakoid Membranes in Complex Media. VII. The Effect of Bovine Serum Albumin

作者: Kurt A. Santarius

DOI: 10.1016/S0015-3796(11)80119-8

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摘要: Summary THe cryoprotective properties of bovine serum albumin (BSA) were investigated with thylakoid membranes isolated from spinach leaves ( Spinacia oleracea L. cv. Monatol). The frozen in a complex salt medium containing the predominant inorganic electrolytes chloroplast stroma. Under mild freezing conditions, only partial stabilization PSII-dependent photosynthetic activities but efficient cryopreservation PSI-mediated photophosphorylation took place presence BSA. lower temperature, less protein was necessary for optimum protection light-induced proton uptake and ATP synthesis. At higher initial BSA concentrations or more severe freezing, i.e. when concentration residual unfrozen fraction exceeded critical limit, rapid inactivation occurred parallel ice crystal formation. This damage due to an increase permeability membranes, while capacity linear whole-chain electron transport remained unaffected even rose relative membranes. effects solutes on can be explained part by colligative action, each solute acts different membrane sites reduces others liquid. In addition, influenced quantity formed, final volume solution, this duration time exposure given temperature. Extremely high thylakoids system caused regardless liquid When kept at 0 °C, effectively stabilized cyclic slightly reduced progressive flow.

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