A Circadian Rhythm in the Activity of Superoxide Dismutase in the Photosynthetic Alga Gonyaulax polyedra

P. Colepicolo Institute de Química, Universidade de São Paulo, Departamento de Bioquímica, São Paulo, Brazil

V. C. P. C. Camarero Institute de Química, Universidade de São Paulo, Departamento de Bioquímica, São Paulo, Brazil

J. Woodland Hastings Department of Cellular and Developmental Biology, Harvard University, Cambridge, Massachusetts, USA

Abstract

The activity of superoxide dismutase in cell-free extracts of Gonyaulax made at different times of day and night was found to be three to four times higher during the day. This rhythm continued in cells kept in constant light, indicating that the regulation can be attributed to the cellular circadian clock.

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A Circadian Rhythm in the Activity of Superoxide Dismutase in the Photosynthetic Alga Gonyaulax polyedra

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A Circadian Rhythm in the Activity of Superoxide Dismutase in the Photosynthetic Alga Gonyaulax polyedra

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