Carriers and Membrane Transport Proteins by Felix Bronner and Arnost Kleinzeller (Eds.)

By Felix Bronner and Arnost Kleinzeller (Eds.)

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According to Katz and Norris (1973), the molecular antenna of chlorophyll, which captures the light energy, has hydrophobic surroundings, whereas the photoactive form at the interface is probably a complex of chlorophyll and water. All of these conditions (solvation of chlorophyll molecule both by water molecules and hydrophobic surroundings) are fulfilled at the liquid hydrocarbon/water interface containing adsorbed chlorophyll. On illuminating the interface in the presence of all the necessary components, Ap changes in reaction (61).

Exposure time: (5) 0; (7) 1 hour. The same system, but NADP replaced by NAD. Exposure time: (8) 0; (9) I hour. (From Boguslavsky et a / . ) 40 L. I . BOGUSLAVSKY these conditions the anodic half-wave of ferricyanide oxidation appeared after illumination. 2 V against a saturated calomel electrode. 5 ferricyanide anions are formed per oxygen molecule: 2 H,O hi, + 4 F e ( C N ) g - T 0, + 4 H+ + 4 Fe(CN)4,- (64) So far the mechanism of reaction (64) has not been studied. We may assume, however, that when porphyrin molecules adsorbed at the interface are excited by light, protons and electrons undergo redistribution in the reaction complex (water, acceptor, RO-), which leads to water decomposition.

Lipopolysaccharide itself is localized on the outer side of the cell membrane, and is strongly bound with membrane lipids. E (41) To obtain the working surface upon which the enzyme can be deposited, a phosphatidylethanolamine monolayer is formed, and then lipopolysaccharide is introduced into the aqueous solution beneath the monolayer. The interaction of both components can be detected by an increase in the surface pressure of the monolayer. The duration is 10-40 minutes, and is accelerated by increasing the temperature and the concentration of lipopolysaccharide.

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