title: Lipid Saturation Induced Microviscosity Increase Has No Effect on the Reducibility of Flash-Oxidized Cytochrome f in Pea Thylakoids.
abstract: Homogeneous catalytic hydrogenation was used to modify the level of fatty acid unsaturation of thylakoid membranes in the pea chloroplast. Fluidity alteration has been monitored simultaneously using the spin-label probe, 16-doxyl stearate. Even in the case of 30% hydrogenation, no change in the reduction rate of flash-oxidized cytochrome f was observed, in contrast to the fact that the same decrease in the double-bond content of the thylakoid membrane resulted in a pronounced inhibition in the full-chain electron transport. We conclude that the rate of lateral diffusion of reduced plastoquinone is unaffected by the lowering of the fluidity of the thylakoid lipid matrix.
authors: Institute of Plant Physiology, Biological Research Center, Hungarian Academy of Sciences, 6701 Szeged, P.O. Box 521, Hungary.
authors: Z
authors: Z
authors: Gombos
authors: K
authors: K
authors: Barabás
authors: F
authors: F
authors: Joó
authors: L
authors: L
authors: Vigh