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Appl Environ Microbiol, May 1998, p. 1972-1974, Vol. 64, No. 5
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Evaluation of Structurally Different Carotenoids in Escherichia coli Transformants as Protectants against UV-B Radiation

Gerhard Sandmann,1,* Silvia Kuhn,2 and Peter Böger2

Botanisches Institut, Fachbereich Biologie, J. W. Goethe Universität, D-60054 Frankfurt,1 and Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, D-78434 Konstanz,2 Germany

Received 2 September 1997/Accepted 17 December 1997

Escherichia coli cells transformed with several carotenogenic genes to mediate the formation of zeta -carotene, neurosporene, lycopene, beta -carotene, and zeaxanthin were exposed to UV-B radiation. Short-term kinetics revealed that endogenous levels of neurosporene and beta -carotene protected E. coli against irradiation with UV-B. Zeaxanthin protected against only the photosensitized UV-B treatment. All other carotenoids were ineffective.

* Corresponding author. Mailing address: Botanisches Institut, Fachbereich Biologie, J. W. Goethe Universität, Postfach 111932, D-60054 Frankfurt, Germany. Phone: +49 69 798 24746. Fax: +49 69 798 24822. E-mail: Sandmann{at}em.uni-frankfurt.d400.de.

Appl Environ Microbiol, May 1998, p. 1972-1974, Vol. 64, No. 5
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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