Ontology highlight
ABSTRACT:
SUBMITTER: Kovaleva EG
PROVIDER: S-EPMC2720167 | biostudies-literature | 2007 Apr
REPOSITORIES: biostudies-literature
Kovaleva Elena G EG Lipscomb John D JD
Science (New York, N.Y.) 20070401 5823
We report the structures of three intermediates in the O2 activation and insertion reactions of an extradiol ring-cleaving dioxygenase. A crystal of Fe2+-containing homoprotocatechuate 2,3-dioxygenase was soaked in the slow substrate 4-nitrocatechol in a low O2 atmosphere. The x-ray crystal structure shows that three different intermediates reside in different subunits of a single homotetrameric enzyme molecule. One of these is the key substrate-alkylperoxo-Fe2+ intermediate, which has been pred ...[more]