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具有强大的β-化酶活性的海洋双功能过程性西兰酶,用于基于西兰的生物质转化应用

Nilakshi Kakati¹, Bipasha Choudhury¹, Madhulika Shrivastava¹

¹Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India.

International journal of biological macromolecules

|November 16, 2025

概括

这项研究特征ZgGH43A,一个外o-β-1,4-xylanase酶,用于高效的生物质转化. 该酶有效地将西兰直接降解为西洛斯,显示与其他西兰酶的协同作用潜力.

科学领域:

生物化学和分子生物学
酶学是一种酶学.
生物质转化技术生物质转化技术

背景情况:

对于有效的生物质转化来说,有效的酶降解西兰是基纤维素生物质中主要的半纤维素,至关重要.
了解西兰降解酶的特性是优化生物燃料和生物化学生产过程的关键.

研究的目的:

来自Zobellia galactanivorans的一种重组异构β-1,4-xylanase,ZgGH43A的表达,净化和表征.
为了评估酶的活性,特异性,稳定性和对各种西兰基质的作用方式.
评估ZgGH43A与生物质水解的其他西兰酶结合的协同潜力.

主要方法:

在大肠杆菌中对ZgGH43A的重组表达和使用固定金属离子亲和染色法进行净化.
使用各种西兰基质进行酶活性测定,确定最佳温度和pH值,并进行稳定性测试.
对基质特异性的分析,作用方式 (TLC,HPLC,MALDI-TOF MS),动力参数,过程性和与另一种西兰酶的协同性水解.

主要成果:

重组ZgGH43A在40°C和pH值为5.5时对线性木西兰 (436.5U/mg) 显示出高活性,具有广泛的基质特异性.
该酶表现出适度的热和pH稳定性,这是其海洋中性动物起源的特征.
ZgGH43A直接在没有中间的西-寡糖酸盐的情况下将西兰化为西酸盐,同时表现出外o-β-1,4-xylanase和β-xylosidase活动.
与AcXyn30B_12的协同作用显著增强了从预处理的米中释放的总糖的减少.

结论:

ZgGH43A是一种多用途的外β-1,4-xylanase,在基纤维素生物质转化中具有潜在的应用.
它的直接水解到西洛斯和协同能力使其成为生物炼油工艺中宝贵的酶.
对酶工程的进一步研究可以提高其稳定性和效率,用于工业应用.

关键词:

GH43家族的家庭.弥索菲尔的弥索菲尔的弥索菲尔的渐进性指数是一个渐进性指数.克西兰是什么意思?克西洛斯 (Xylose) 是一种酶.

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