alexa Inactivation of lignin peroxidase by hydrogen peroxide during the oxidation of phenols.


Journal of Environmental Analytical Chemistry

Author(s): Chung N, Aust SD

Abstract Share this page

Abstract The oxidation of phenols by lignin peroxidase (LiP) was characterized by a rapid decrease in enzyme activity. The initial oxidation rate of phenol decreased at moderately high (i.e., 400 microM) concentrations of H2O2. Similar results were obtained with several phenols. However, LiP was not inactivated during the oxidation of veratryl alcohol (VA). The apparent second-order rate constants for the reaction of compound II with phenol and VA at pH 3.5 were very similar, about 2.1 x 10(4) and 4.7 x 10(4) M-1 s-1, respectively. However, unlike VA, phenols could not convert compound III back to ferric enzyme. The visible absorption spectra of compound II and III were observed during oxidation of VA and phenols, respectively. These results suggest that the inactivation of LiP during the oxidation of phenols was mainly due to the accumulation of compound III, which was attributed to the inability of phenols or phenoxyl radicals to revert compound III to ferric enzyme. All of these results also suggested that the inactivation mechanism of LiP during oxidation of phenols was different from that during oxidation of anisyl alcohol, since anisyl alcohol was neither a substrate of compound II nor could it revert compound III [K. Valli et al. (1990) Biochemistry 29, 8535-8539 and R.S. Koduri and M. Tien (1994) Biochemistry 33, 4225-4230]. This article was published in Arch Biochem Biophys and referenced in Journal of Environmental Analytical Chemistry

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version