Natural Syringyl Mediators Accelerate Laccase-Catalyzed β-O-4 Cleavage and Cα-Oxidation of a Guaiacyl Model Substrate via an Aggregation Mechanism.
Natural Syringyl Mediators Accelerate Laccase-Catalyzed β-O-4 Cleavage and Cα-Oxidation of a Guaiacyl Model Substrate via an Aggregation Mechanism.
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天然紫丁香基介体通过聚集机制加速愈创木基模型底物漆酶催化的 β-O-4 裂解和 C α 氧化
DOI：
10.1021/acsomega.1c02501
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发表时间：
2021-09-07
期刊：
影响因子：
4.1
通讯作者：
Zhao YL
中科院分区：
文献类型：
--
作者：
Chen X;Ouyang X;Li J;Zhao YL
Laccase–mediator systems (LMSs) have been intensively investigated in lignin degradation. Although only natural metabolites are available for fungal lignin degradation, mediator molecules from metabolites have received substantially less attention than artificial organic–synthetic compounds. It remains unclear which metabolites can accelerate laccase-catalyzed reactions and how those natural mediators influence lignin degradation. In this work, we evaluated Trametes versicolor laccase-catalyzed reaction kinetics on a lignin guaiacyl subunit model (guaiacylglycerol-β-guaiacyl ether, G-β-GE) in the presence of a group of lignin syringyl subunit molecules: syringaldehyde, acetosyringone, and methyl syringate. We then compare their performance to a well-known synthetic mediator ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid). Time-resolved UPLC-TOF-MS revealed that the syringyl mediators were more effective in accelerating the β-O-4 cleavage and Cα-oxidation of G-β-GE than ABTS under laccase-catalysis, despite the syringyl compounds possessing slower individual oxidation rates. In addition, the product profile of polymerization was also promoted dramatically, compared to that of the ABTS/laccase system. The LMS kinetic modeling suggested that mediator–substrate aggregation played a critical role in the laccase–mediator system; in which, the lignin syringyl and guaiacyl subunits likely form a π–π stacking van der Waals complex that can be oxidized faster than the syringyl or guaiacyl monomers by themselves. This syringyl–guaiacyl aggregation hypothesis postulates that the weak interactions in lignin biopolymers are able to accelerate the laccase-catalyzed biodegradation.
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影响因子：
14.9
作者：
Jeske L;Placzek S;Schomburg I;Chang A;Schomburg D
通讯作者：
Schomburg D
影响因子：
3.4
作者：
Kawai, S;Nakagawa, M;Ohashi, H
通讯作者：
Ohashi, H
影响因子：
3.5
作者：
KAWAI, S;UMEZAWA, T;HIGUCHI, T
通讯作者：
HIGUCHI, T
影响因子：
3.5
作者：
BOURBONNAIS, R;PAICE, MG
通讯作者：
PAICE, MG
影响因子：
11.4
作者：
Gouveia, S.;Fernandez-Costas, C.;Moldes, D.
通讯作者：
Moldes, D.