Interactions Between Ferredoxin and Chlorophyll in a Monolayer System

Seymour Steven Brody 1
  • 1 Photobiology Laboratory, Department of Biology, Washington Sq., New York University, New York

Ferredoxin (Fd) is surface active; both its area/molecule, A, and surface potential, ΔV, (at an air-water interface) vary with the pH of the subphase. From the surface isotherms (at pH 7.7) A and ΔV are 167 A2 and 170 ± 20 mV, respectively, when the surface tension is 10 dyne/cm.

Fd and chlorophyll a (Chl) appear to form a mixed monomolecular film. At pH 7.7 a maximum interaction between Fd and Chl is observed when the monolayer contains a mole ratio of Fd/Chl ≅ 2. Irradiaion of Chl-Fd films, in nitrogen atmosphere, results in a bleaching of Chl and an increase of ΔV. The quantum yield for this bleaching is estimated to be 0.4.

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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.