酵母表面显示由酵母产生的Aga2-乳糖酶融合的氧化性能
Dulce Y Arenas-Olivares1, Daniel Morales-Guzmán1, Karla V Teymennet-Ramírez1,2
1Centro de Investigación en Biotecnología, Universidad Autónoma del Estado de Morelos, Morelos, México.
Biotechnology and applied biochemistry
|May 5, 2025
概括
研究人员通过将其从酵母细胞中释放成融合蛋白来提高重组乳酶的稳定性. 这种工程乳酶表现出增强的性能和稳定性,表明了更广泛的酶应用的潜力.
科学领域:
- 生物技术和生物催化剂
- 酵素工程是什么意思 酵素工程
- 分子生物学分子生物学
背景情况:
- 乳酶是具有广泛工业应用的多功能多铜氧化酶.
- 酵母表面显示 (YSD) 技术使强大的氧化生物催化剂的开发成为可能.
- 研究从酵母表面释放的重组乳酶可以提高酶的性能和稳定性.
研究的目的:
- 为了优化从Saccharomyces cerevisiaeEBY100细胞表面释放复合乳酶 (OB1) 的条件.
- 描述和比较释放的乳酶融合蛋白与全细胞系统的生物化学特性.
- 评估Aga2粘合因融合对乳酶性能和稳定性的影响.
主要方法:
- 使用2^2因数实验设计来确定最佳的释放条件 (生物质和dithiothreitol度).
- 构造和表达的重组乳糖酶 (OB1) 通过柔性链接器与Aga2粘合素融合.
- 生物化学特征六个laccase变体,专注于动力参数 (K_m,V_max),热稳定性,pH活性,基质氧化和乙醇耐受性.
主要成果:
- 确定了从酵母表面释放Aga2-3x(G4S) -OB1融合蛋白的最佳条件.
- 乳糖酶变体TX13A-OB1表现出优异的性能,K_m为0.0137 ± 0.0032 mM,用于ABTS.
- 所有变种在60°C时都表现出热稳定性,在pH3-5之间保持>50%的活性,表现出改善的酸氧化,在10%-20%的乙醇中保持>60%的活性.
结论:
- 成功提高了从酵母细胞表面释放的重组乳酶的稳定性,通过设计具有粘附域的融合蛋白.
- 该Aga2粘附域似乎对laccase的性能和稳定性产生积极影响.
- 这种方法有望通过工程粘合融合,为乳酶和其他酶的更广泛应用提供潜力.
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