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Biophysical Journal 58: 817-822 (1990)
© 1990 the Biophysical Society

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Fluorescence lifetime distributions in human superoxide dismutase. Effect of temperature and denaturation.

N Rosato, E Gratton, G Mei and A Finazzi-Agrò

Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Università di Roma Tor Vergata, Italy.

ABSTRACT

The internal dynamics of human superoxide dismutase has been studied using time-resolved fluorescence. The fluorescence decay has been analyzed using continuous distribution of lifetime values. The effect of temperature and conformational state on the lifetime distribution has been investigated. The emission of the single tryptophan residue depends on the nature and dynamics of the protein matrix. Conformational changes have been induced by increased concentration of guanidinium hydrochloride. We found that both temperature and conformation strongly effect the width of the lifetime distribution.






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Copyright © 1990 by the Biophysical Society.