Oxidation of aliphatic olefins by toluene dioxygenase: enzyme rates and product identification.

Abstract:

:Toluene dioxygenase from Pseudomonas putida F1 has been studied extensively with aromatic substrates. The present work examined the toluene dioxygenase-catalyzed oxidation of various halogenated ethenes, propenes, butenes and nonhalogenated cis-2-pentene, an isomeric mix of 2-hexenes, cis-2-heptene, and cis-2-octene as substrates for toluene dioxygenase. Enzyme specific activities were determined for the more water-soluble C2 to C5 compounds and ranged from <4 to 52 nmol per min per mg of protein. Trichloroethene was oxidized at a rate of 33 nmol per min per mg of protein. Products from enzyme reactions were identified by gas chromatography-mass spectrometry. Proton and carbon nuclear magnetic resonance spectroscopy of compounds from whole-cell incubation confirmed the identity of products. Substrates lacking a halogen substituent on sp2 carbon atoms were dioxygenated, while those with halogen and one or more unsubstituted allylic methyl groups were monooxygenated to yield allylic alcohols. 2,3-Dichloro-1-propene, containing both a halogenated double bond and a halogenated allylic methyl group, underwent monooxygenation with allylic rearrangement to yield an isomeric mixture of cis- and trans-2,3-dichloro-2-propene-1-ol.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Lange CC,Wackett LP

doi

10.1128/jb.179.12.3858-3865.1997

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

3858-65

issue

12

eissn

0021-9193

issn

1098-5530

journal_volume

179

pub_type

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