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-Structure paper
| タイトル | Structure-guided protein engineering and immobilization of an amidohydrolase for efficient ochratoxin A detoxification. |
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| ジャーナル・号・ページ | Int J Biol Macromol, Vol. 358, Page 151671, Year 2026 |
| 掲載日 | 2026年3月26日 |
著者 | Yumei Hu / Yuhang Xu / Biyu He / Du Niu / Xuechun Yang / Jiaping Huang / Zhenzhen Xie / Panpan Shen / Xian Li / Maosen Bai / Ziwei Liu / Hao Li / Yunyun Yang / Jian-Wen Huang / Chun-Chi Chen / Rey-Ting Guo / Longhai Dai / ![]() |
| PubMed 要旨 | Ochratoxin A (OTA) is a pervasive and significant mycotoxin that poses serious health risks to humans and animals. The development of efficient biocatalysts for the enzymatic detoxification of OTA is ...Ochratoxin A (OTA) is a pervasive and significant mycotoxin that poses serious health risks to humans and animals. The development of efficient biocatalysts for the enzymatic detoxification of OTA is of great importance. In this study, we enhanced the OTA-degrading activity of three amidohydrolases (ADHs) by up to ninefold. This improvement was achieved by reducing steric hindrance in the binding pocket and fine-tuning the hydrophilic interactions between the enzyme and substrate. The most efficient variant, PwADH/DM, was immobilized onto magnetic FeO nanoparticles functionalized by the co-deposition of dopamine and polyethyleneimine. Under optimal conditions, this immobilization process achieved a high immobilization efficiency (85.4%) and activity recovery (76.9%). The immobilized enzyme exhibited enhanced pH stability and thermostability, along with good storage stability, reusability, and recyclability. More importantly, the immobilized enzyme completely degraded 100 ng/mL OTA in contaminated milk without affecting the milk's properties. These findings expand our understanding of the molecular mechanisms governing substrate binding and catalysis in OTA-degrading ADHs. Furthermore, they provide a blueprint for enzyme-based OTA decontamination during food processing. |
リンク | Int J Biol Macromol / PubMed:41903634 |
| 手法 | EM (単粒子) |
| 解像度 | 2.69 - 2.9 Å |
| 構造データ | EMDB-62778, PDB-9l2o: EMDB-62780, PDB-9l2t: EMDB-62782, PDB-9l36: EMDB-62861, PDB-9l6p: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-97U: |
| 由来 |
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キーワード | HYDROLASE / amide hydrolase / Iron-binding / Ochratoxin A / ZN / TOXIN |
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pseudoxanthomonas wuyuanensis (バクテリア)
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