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Appl Microbiol Biotechnol. 2009 Jan;81(6):1071-6. doi: 10.1007/s00253-008-1704-y. Epub 2008 Sep 25.

Hydroxylation of naphthalene by aromatic peroxygenase from Agrocybe aegerita proceeds via oxygen transfer from H2O2 and intermediary epoxidation.

Author information

1
Unit of Environmental Biotechnology, International Graduate School of Zittau, Zittau, Germany. kluge@ihi-zittau.de

Abstract

Agrocybe aegerita peroxidase/peroxygenase (AaP) is an extracellular fungal biocatalyst that selectively hydroxylates the aromatic ring of naphthalene. Under alkaline conditions, the reaction proceeds via the formation of an intermediary product with a molecular mass of 144 and a characteristic UV absorption spectrum (A(max) 210, 267, and 303 nm). The compound was semistable at pH 9 but spontaneously hydrolyzed under acidic conditions (pH<7) into 1-naphthol as major product and traces of 2-naphthol. Based on these findings and literature data, we propose naphthalene 1,2-oxide as the primary product of AaP-catalyzed oxygenation of naphthalene. Using (18)O-labeled hydrogen peroxide, the origin of the oxygen atom transferred to naphthalene was proved to be the peroxide that acts both as oxidant (primary electron acceptor) and oxygen source.

PMID:
18815784
DOI:
10.1007/s00253-008-1704-y
[Indexed for MEDLINE]

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