Lignin peroxidase compound III: Mechanism of formation and decomposition

Hiroyuki Wariishi, Michael H. Gold

研究成果: ジャーナルへの寄稿記事

146 引用 (Scopus)

抄録

Lignin peroxidase compound III (LiPIII) was prepared via three procedures: (a) ferrous LiP + O2 (LiPIIIa), (6) ferric LiP + Oi (LiPIIIb), and (c) LiP compound II + excess H2O2 followed by treatment with catalase (LiPIIIc). LiPIIIa, b, and c each have a Soret maximum at ∼414 nm and visible bands at 543 and 578 nm. LiPIIIa, b, and c each slowly reverted to native ferric LiP, releasing stoichiometric amounts of O2 .- in the process. Electronic absorption spectra of LiPIII reversion to the native enzyme displayed isosbestic points in the visible region at 470, 525, and 597 nm, suggesting a single-step reversion with no intermediates. The LiPIII reversion reactions obeyed first-order kinetics with rate constants of ∼1.0 x 10-3 s-1. In the presence of excess peroxide, at pH 3.0, native LiP, LiPII, and LiPIIIa, b, and c are all converted to a unique oxidized species (LiPIII*) with a spectrum displaying visible bands at 543 and 578 nm, but with a Soret maximum at 419 nm, red-shifted 5 nm from that of LiPIII. LiPIII* is bleached and inactivated in the presence of excess H2O2 via a biphasic process. The fast first phase of this bleaching reaction obeys second-order kinetics, with a rate constant of 1.7 × 101 M-1 s-1. Addition of veratryl alcohol to LiPIII* results in its rapid reversion to the native enzyme, via an apparent one-step reaction that obeys second-order kinetics with a rate constant of 3.5 × 101 M-1 s-1. Stoichiometric amounts of O2 .- are released during this reaction. When this reaction was run under conditions that prevented further reactions, HPLC analysis of the products demonstrated that veratryl alcohol was not oxidized. These results suggest that the binding of veratryl alcohol to LiPIII* displaces O2 .-, thus returning the enzyme to its native state. In contrast, the addition of veratryl alcohol to LiPIII did not affect the rate of spontaneous reversion of LiPIII to the native enzyme.

元の言語英語
ページ(範囲)2070-2077
ページ数8
ジャーナルJournal of Biological Chemistry
265
発行部数4
出版物ステータス出版済み - 2 5 1990
外部発表Yes

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Decomposition
Rate constants
Enzymes
Kinetics
lignin peroxidase
Peroxides
Bleaching
Catalase
Absorption spectra
High Pressure Liquid Chromatography
veratryl alcohol

All Science Journal Classification (ASJC) codes

  • Biochemistry

これを引用

Lignin peroxidase compound III : Mechanism of formation and decomposition. / Wariishi, Hiroyuki; Gold, Michael H.

:: Journal of Biological Chemistry, 巻 265, 番号 4, 05.02.1990, p. 2070-2077.

研究成果: ジャーナルへの寄稿記事

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title = "Lignin peroxidase compound III: Mechanism of formation and decomposition",
abstract = "Lignin peroxidase compound III (LiPIII) was prepared via three procedures: (a) ferrous LiP + O2 (LiPIIIa), (6) ferric LiP + Oi (LiPIIIb), and (c) LiP compound II + excess H2O2 followed by treatment with catalase (LiPIIIc). LiPIIIa, b, and c each have a Soret maximum at ∼414 nm and visible bands at 543 and 578 nm. LiPIIIa, b, and c each slowly reverted to native ferric LiP, releasing stoichiometric amounts of O2 .- in the process. Electronic absorption spectra of LiPIII reversion to the native enzyme displayed isosbestic points in the visible region at 470, 525, and 597 nm, suggesting a single-step reversion with no intermediates. The LiPIII reversion reactions obeyed first-order kinetics with rate constants of ∼1.0 x 10-3 s-1. In the presence of excess peroxide, at pH 3.0, native LiP, LiPII, and LiPIIIa, b, and c are all converted to a unique oxidized species (LiPIII*) with a spectrum displaying visible bands at 543 and 578 nm, but with a Soret maximum at 419 nm, red-shifted 5 nm from that of LiPIII. LiPIII* is bleached and inactivated in the presence of excess H2O2 via a biphasic process. The fast first phase of this bleaching reaction obeys second-order kinetics, with a rate constant of 1.7 × 101 M-1 s-1. Addition of veratryl alcohol to LiPIII* results in its rapid reversion to the native enzyme, via an apparent one-step reaction that obeys second-order kinetics with a rate constant of 3.5 × 101 M-1 s-1. Stoichiometric amounts of O2 .- are released during this reaction. When this reaction was run under conditions that prevented further reactions, HPLC analysis of the products demonstrated that veratryl alcohol was not oxidized. These results suggest that the binding of veratryl alcohol to LiPIII* displaces O2 .-, thus returning the enzyme to its native state. In contrast, the addition of veratryl alcohol to LiPIII did not affect the rate of spontaneous reversion of LiPIII to the native enzyme.",
author = "Hiroyuki Wariishi and Gold, {Michael H.}",
year = "1990",
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TY - JOUR

T1 - Lignin peroxidase compound III

T2 - Mechanism of formation and decomposition

AU - Wariishi, Hiroyuki

AU - Gold, Michael H.

PY - 1990/2/5

Y1 - 1990/2/5

N2 - Lignin peroxidase compound III (LiPIII) was prepared via three procedures: (a) ferrous LiP + O2 (LiPIIIa), (6) ferric LiP + Oi (LiPIIIb), and (c) LiP compound II + excess H2O2 followed by treatment with catalase (LiPIIIc). LiPIIIa, b, and c each have a Soret maximum at ∼414 nm and visible bands at 543 and 578 nm. LiPIIIa, b, and c each slowly reverted to native ferric LiP, releasing stoichiometric amounts of O2 .- in the process. Electronic absorption spectra of LiPIII reversion to the native enzyme displayed isosbestic points in the visible region at 470, 525, and 597 nm, suggesting a single-step reversion with no intermediates. The LiPIII reversion reactions obeyed first-order kinetics with rate constants of ∼1.0 x 10-3 s-1. In the presence of excess peroxide, at pH 3.0, native LiP, LiPII, and LiPIIIa, b, and c are all converted to a unique oxidized species (LiPIII*) with a spectrum displaying visible bands at 543 and 578 nm, but with a Soret maximum at 419 nm, red-shifted 5 nm from that of LiPIII. LiPIII* is bleached and inactivated in the presence of excess H2O2 via a biphasic process. The fast first phase of this bleaching reaction obeys second-order kinetics, with a rate constant of 1.7 × 101 M-1 s-1. Addition of veratryl alcohol to LiPIII* results in its rapid reversion to the native enzyme, via an apparent one-step reaction that obeys second-order kinetics with a rate constant of 3.5 × 101 M-1 s-1. Stoichiometric amounts of O2 .- are released during this reaction. When this reaction was run under conditions that prevented further reactions, HPLC analysis of the products demonstrated that veratryl alcohol was not oxidized. These results suggest that the binding of veratryl alcohol to LiPIII* displaces O2 .-, thus returning the enzyme to its native state. In contrast, the addition of veratryl alcohol to LiPIII did not affect the rate of spontaneous reversion of LiPIII to the native enzyme.

AB - Lignin peroxidase compound III (LiPIII) was prepared via three procedures: (a) ferrous LiP + O2 (LiPIIIa), (6) ferric LiP + Oi (LiPIIIb), and (c) LiP compound II + excess H2O2 followed by treatment with catalase (LiPIIIc). LiPIIIa, b, and c each have a Soret maximum at ∼414 nm and visible bands at 543 and 578 nm. LiPIIIa, b, and c each slowly reverted to native ferric LiP, releasing stoichiometric amounts of O2 .- in the process. Electronic absorption spectra of LiPIII reversion to the native enzyme displayed isosbestic points in the visible region at 470, 525, and 597 nm, suggesting a single-step reversion with no intermediates. The LiPIII reversion reactions obeyed first-order kinetics with rate constants of ∼1.0 x 10-3 s-1. In the presence of excess peroxide, at pH 3.0, native LiP, LiPII, and LiPIIIa, b, and c are all converted to a unique oxidized species (LiPIII*) with a spectrum displaying visible bands at 543 and 578 nm, but with a Soret maximum at 419 nm, red-shifted 5 nm from that of LiPIII. LiPIII* is bleached and inactivated in the presence of excess H2O2 via a biphasic process. The fast first phase of this bleaching reaction obeys second-order kinetics, with a rate constant of 1.7 × 101 M-1 s-1. Addition of veratryl alcohol to LiPIII* results in its rapid reversion to the native enzyme, via an apparent one-step reaction that obeys second-order kinetics with a rate constant of 3.5 × 101 M-1 s-1. Stoichiometric amounts of O2 .- are released during this reaction. When this reaction was run under conditions that prevented further reactions, HPLC analysis of the products demonstrated that veratryl alcohol was not oxidized. These results suggest that the binding of veratryl alcohol to LiPIII* displaces O2 .-, thus returning the enzyme to its native state. In contrast, the addition of veratryl alcohol to LiPIII did not affect the rate of spontaneous reversion of LiPIII to the native enzyme.

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