Purification and characterization of the enzymes from Brevundimonas naejangsanensis that degrade ochratoxin A and B
作者:Mengxue Peng、Zhenzhen Zhang、Xinge Xu、Haoxiang Zhang、Zitong Zhao、Zhihong Liang
DOI:10.1016/j.foodchem.2023.135926
日期:2023.9
co-contaminate many types of agricultural products. Screening enzymes that degrade both OTA and OTB has significance in food safety. In this study, four novel OTA and OTB degrading enzymes, namely BnOTase1, BnOTase2, BnOTase3, and BnOTase4, were purified from the metabolites of the Brevundimonas naejangsanensis ML17 strain. These four enzymes hydrolyzed OTA into OTα and hydrolyzed OTB into OTβ. BnOTase1
赭曲霉毒素 A (OTA) 和赭曲霉毒素 B (OTB) 会共同污染多种农产品。筛选同时降解 OTA 和 OTB 的酶对食品安全具有重要意义。在这项研究中,从Brevundimonas naejangsanensis ML17 菌株的代谢物中纯化了四种新型 OTA 和 OTB 降解酶,即Bn OTase1、Bn OTase2、Bn OTase3 和Bn OTase4 。这四种酶将 OTA 水解成 OTα,将 OTB 水解成 OTβ。Bn OTase1、Bn OTase2、Bn OTase3 和Bn OTase4 具有表观K m水解 OTA 的值分别为 19.38、0.92、12.11、1.09 μmol/L 和水解 OTB 的值分别为 0.76、2.43、0.60、0.64 μmol/L。OTα 和 OTβ 对 HEK293 细胞没有显着的细胞毒性,表明这些酶减轻了 OTA 和 OTB 的