Catalytic mechanism of the tyrosinase reaction toward the Tyr98 residue in the caddie protein
PLoS Biology 16 巻 12 号
e3000077- 頁
2018-12-31 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Catalytic mechanism of the tyrosinase reaction toward the Tyr98 residue in the caddie protein
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| 作成者 |
Kihara Shogo
Bando Naohiko
Yoshitsu Hironari
Sakaguchi Miyuki
Kayama Kure'e
Yanagisawa Sachiko
Ogura Takashi
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| 収録物名 |
PLoS Biology
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| 巻 | 16 |
| 号 | 12 |
| 開始ページ | e3000077 |
| 抄録 |
Tyrosinase (EC 1.14.18.1), a copper-containing monooxygenase, catalyzes the conversion of phenol to the corresponding ortho-quinone. The Streptomyces tyrosinase is generated as a complex with a “caddie” protein that facilitates the transport of two copper ions into the active center. In our previous study, the Tyr98 residue in the caddie protein, which is accommodated in the pocket of active center of tyrosinase, has been found to be converted to a reactive quinone through the formations of the μ-η2:η2-peroxo-dicopper(II) and Cu(II)-dopasemiquinone intermediates. Until now—despite extensive studies for the tyrosinase reaction based on the crystallographic analysis, low-molecular-weight models, and computer simulations—the catalytic mechanism has been unable to be made clear at an atomic level. To make the catalytic mechanism of tyrosinase clear, in the present study, the cryo-trapped crystal structures were determined at very high resolutions (1.16–1.70 Å). The structures suggest the existence of an important step for the tyrosinase reaction that has not yet been found: that is, the hydroxylation reaction is triggered by the movement of CuA, which induces the syn-to-anti rearrangement of the copper ligands after the formation of μ-η2:η2-peroxo-dicopper(II) core. By the rearrangement, the hydroxyl group of the substrate is placed in an equatorial position, allowing the electrophilic attack to the aromatic ring by the Cu2O2 oxidant.
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| 内容記述 |
This study was partly supported by grants (nos. 25109530 and 15H009470 to YM, and 25109540 and 15H00960 to TO, Stimuli-Responsive Chemical Species) for Scientific Research on Innovative Areas and by a grant for Scientific Research (22550153 to MS) from MEXT of Japan. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
Public Library of Science
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| 発行日 | 2018-12-31 |
| 権利情報 |
© 2018 Matoba et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 1544-9173
[ISSN] 1545-7885
[DOI] 10.1371/journal.pbio.3000077
[DOI] https://doi.org/10.1371/journal.pbio.3000077
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