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橘色梅泽氏菌新型角质酶的发掘、性质及在合成短链脂肪酸酯中的应用
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陈岩(2001-),女,硕士研究生,研究方向:食品酶工程,E-mail:s20233061264@cau.edu.cn 通讯作者:杨绍青(1980-),男,博士,教授,研究方向:食品酶工程,E-mail:ysq@cau.edu.cn

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国家重点研发计划项目(2022YFD2101400)


Characterization of A Novel Cutinase from Umezawaea tangerine and Its Application in Short-chain Aliphatic Esters Synthesis
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    摘要:

    短链脂肪酸酯具有令人愉悦的、类似水果和脂肪的香味,在食品和化妆品等领域应用广泛。角质酶能催化有机酸和醇反应生成短链脂肪酸酯,酶法合成相比与化学合成具有反应条件温和且环境友好等优点。本研究旨在挖掘新型角质酶,研究其酶学性质,并用于高效合成短链脂肪酸酯。从橘色梅泽氏菌(Umezawaea tangerina)中克隆得到角质酶基因(UtCut),构建重组表达质粒pET-32a-UtCut并在大肠杆菌BL21(DE3)中表达,经亲和层析纯化后研究了重组角质酶(UtCut)的酶学性质,并测定了该酶对短链脂肪酸酯的合成效果。结果表明,UtCut与地中海拟无枝酸菌(Amycolatopsis mediterranei)角质酶相似性最高,为74.9%。UtCut的比酶活力为279.29 U•mg-1,最适pH值和温度分别为pH值8.0和35 ℃,在pH值6.0~8.5和35 ℃以下保持稳定。该酶对pNPH(C6)和三丁酸甘油酯水解活性最高。UtCut在35 ℃、加酶量25 U•mL-1的条件下合成己酸乙酯的酯化率为100%。本研究挖掘的新型角质酶UtCut对短链脂肪酸酯具有高效的合成效果,在风味酯合成领域具有较大的潜在应用价值。

    Abstract:

    Short-chain aliphatic esters possess pleasant fruity and fatty aromas and are widely used in food products and cosmetics. Cutinases can catalyze the synthesis of short-chain aliphatic esters from organic acids and alcohols. Compared with chemical synthesis, enzymatic synthesis of short-chain aliphatic esters has advantages such as mild reaction conditions and environmental friendliness. The present study aimed to identify novel cutinases and investigate their application potential in the efficient synthesis of short-chain aliphatic esters. A cutinase gene (UtCut) was cloned from Umezawaea tangerine and expressed in Escherichia coli BL21 (DE3). The recombinant enzyme (UtCut) was purified by affinity chromatography and characterized, and its effects on the synthesis of short-chain aliphatic esters were determined. The results indicated that UtCut shared the highest similarity of 74.9% with the cutinase derived from Amycolatopsis mediterranei. The specific activity of UtCut was 279.29 U•mg-1, and its optimum pH and temperature were 8.0 and 35 ℃, respectively. The enzyme maintained its stability at temperatures up to 35 ℃ and within the pH range of 6.0~8.5. It showed the highest hydrolytic activity toward pNPH (C6) and tributyrin. At an enzyme concentration of 25 U•mL-1 and temperature of 35 ℃, an esterification rate of 100% was obtained for the synthesis of ethyl caproate. The newly identified cutinase may have application potential in the flavor ester production industry.

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陈岩,胡志怡,江正强,闫巧娟,杨绍青.橘色梅泽氏菌新型角质酶的发掘、性质及在合成短链脂肪酸酯中的应用[J].现代食品科技,2026,42(10):10-18.

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  • 收稿日期:2025-12-31
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  • 在线发布日期: 2026-11-11
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