PMID: 6966162Mar 1, 1980Paper

Effect of deuteration on the kinetics of photoinduced electron transport in the reaction centers of purple bacteria

Biofizika
P P NoksA B Rubin

Abstract

Substitution of H2O for D2O in the preparations of reaction centres from chromatophore membranes of photosynthesizing bacteria Rhodopseudomonas sphaeroides, 1760-1 results in a decrease of the efficiency of direct electron transfer from photoreduced primary quinone X1- to the secondary ones and in rising possibilities for reversible reaction X1- with photooxidized bacteriochlorophyll. The value of isotope effect which does not usually exceed 1.2 depends on temperature; it is not found in the temperature range below -60 degrees divided by -80 degrees C.

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