Download e-book for iPad: A New Look at Mechanisms in Bioenergetics by Efraim Racker

By Efraim Racker

ISBN-10: 0125746709

ISBN-13: 9780125746700

ISBN-10: 0125746725

ISBN-13: 9780125746724

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Asymmetric Assembly of the Chloroplast Membrane One other and important similarity between chloroplasts and mitochondria is the asymmetric organization of electron transport catalysts within the membrane. We were first faced with this problem when we examined the role of plastocyanin in photophosphorylation. Plastocyanin has been proposed to serve as an electron carrier between photosystem I and II (Katoh and Takamiya, 1965). However, considerable controversy has arisen about its function, and in several papers a stimulation of electron transport by plastocyanin added externally to chloroplasts has been described.

An active ATPase with coupling factor activity can also be prepared in the presence of low concentrations of DTT if the chloroplasts are first exposed to light (McCarty and Racker, 1968). The presence of ATPase activity in CFx isolated from light-exposed chloroplasts also indicates a conformational change in the membrane-bound CFx. More direct evidence for light-induced conformational changes in membrane-bound CFx was demonstrated by Ryrie and Jagendorf (1971) who observed uptake of tritium from water into CFx following exposure of chloroplasts to light.

Reversal of Photophosphorylation 43 It is possible, however, to induce ATPase activity (Petrack and 32 Lipmann, 1961) and Pi~ATP exchange (Carmeli and Avron, 1966; McCarty and Racker, 1966) in chloroplasts. However, in both cases there is a requirement for a dithiol compound which is not needed in the forward reaction of photophosphorylation. We propose that the differences in the reversibility of energy transfer reactions in mitochondria and chloroplasts are related to the properties of the e subunit of CFx (inhibitor of ATPase activity).

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A New Look at Mechanisms in Bioenergetics by Efraim Racker

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