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Hemerythrin's Oxygen-Binding Reaction Studied by Laser Photolysis
Neil Alberding, Daniel Lavalette and Robert H. Austin
Proceedings of the National Academy of Sciences of the United States of America
Vol. 78, No. 4, [Part2: Biological Sciences] (Apr., 1981), pp. 2307-2309
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/10164
Page Count: 3
You can always find the topics here!Topics: Viscosity, Oxygen, Photolysis, Kinetics, Solvents, Lasers, Hemeproteins, Ligands, Signals, Binding sites
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The dioxygen-iron bond in oxyhemerythrin is shown to be photosensitive. The recombination reaction after photodissociation depends strongly on solvent viscosity. In water (η =1 centipoise or 1× 10-3 Pa· s) the recombination is monophasic and second-order in solvent oxygen concentration, with a bimolecular rate coefficient of 2.9× 107 M-1 s-1. In a glycerol/water mixture (η =180 centipoise) a concentration-dependent geminate recombination process is also seen. This opens a class of proteins to study by flash photolysis.
Proceedings of the National Academy of Sciences of the United States of America © 1981 National Academy of Sciences