Structural and Functional Studies of Aspergillus oryzae Cutinase: Enhanced Thermostability and Hydrolytic Activity of Synthetic Ester and Polyester Degradation

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• 作者：Zhiqiang Liu ; Yuying Gosser ; Peter James Baker ; Yaniv Ravee ; Ziying Lu ; Girum Alemu ; Huiguang Li ; Glenn L. Butterfoss ; Xiang-Peng Kong ; Richard Gross ; Jin Kim Montclare
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：November 4, 2009
• 年：2009
• 卷：131
• 期：43
• 页码：15711-15716
• 全文大小：342K
• 年卷期：v.131,no.43(November 4, 2009)
• ISSN：1520-5126

文摘

Cutinases are responsible for hydrolysis of the protective cutin lipid polyester matrix in plants and thus have been exploited for hydrolysis of small molecule esters and polyesters. Here we explore the reactivity, stability, and structure of Aspergillus oryzae cutinase and compare it to the well-studied enzyme from Fusarium solani. Two critical differences are highlighted in the crystallographic analysis of the A. oryzae structure: (i) an additional disulfide bond and (ii) a topologically favored catalytic triad with a continuous and deep groove. These structural features of A. oryzae cutinase are proposed to result in an improved hydrolytic activity and altered substrate specificity profile, enhanced thermostability, and remarkable reactivity toward the degradation of the synthetic polyester polycaprolactone. The results presented here provide insight into engineering new cutinase-inspired biocatalysts with tailor-made properties.