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Science 25 July 1975:
Vol. 189. no. 4199, pp. 295 - 297
DOI: 10.1126/science.1145203
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Articles

Science, Vol 189, Issue 4199, 295-297
Copyright © 1975 by American Association for the Advancement of Science

articles

Oxidation of the carcinogens benzo [a] pyrene and benzo [a] anthracene to dihydrodiols by a bacterium

DT Gibson, V Mahadevan, DM Jerina, H Yogi, and HJ Yeh

A mutant strain of Beijerinckia, after growth with succinate plus biphenyl, contains an enzyme system that oxidizes benzo [a] pyrene and benzo [a] anthracene to mixtures of vicinal dihydrodiols. The major dihydrodiol formed from benzo [a] pyrene was identified as cis-9, 10-dihydroxy-9, 10-dihydrobenzo [a] pyrene by comparison with a synthetic sample. Benzo [a] anthracene was metabolized to four dihydrodiols, the major isomer being cis-1, 2-dihydroxy-1, 2-dihydroxy-1, 2-dihydrobenzo [a] anthracene.


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