生物催化级联到多糖胺氨化
Xuebin Feng1, Siyi Hong1, Hongbo Zhao2
1Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada.
Biotechnology for biofuels and bioproducts
|February 26, 2024
概括
这项研究开发了一种使用氧化酶-氨基酸转氨酶级联的多糖胺化酶方法. 菌米氨基转氨酶 (SpATA) 显示出更高的产量和稳定性,酶工程改善了产品结果.
科学领域:
- 生物技术是生物技术.
- 酶学 是一种酶学.
- 聚合物化学 聚合物化学
背景情况:
- 是一种有价值的生物聚合物,但其应用受到收获和结构多功能性挑战的限制.
- 提出了一种使用碳水化合物氧化还原酶和氨基转氨酶的新型两步级联反应,用于植物多糖胺氨化.
- 这项研究的重点是比较两个氨基转氨酶,CvATA和SpATA,并为提高性能设计SpATA.
研究的目的:
- 开发一种用于多糖胺胺的单酶法.
- 为了比较CvATA和SpATA在氨基化反应中的效率.
- 通过酶工程来增强SpATA活动和稳定性.
主要方法:
- 开发一种定量色度测定方法,用于转胺化产量测量.
- 对各种氧化碳水化合物的CvATA和SpATA性能进行比较.
- 通过点突变对SpATA进行酶工程.
- 使用HPLC和XPS分析氨基碳水化合物,包括乳标签.
主要成果:
- 与CvATA相比,SpATA表现出更高的运营稳定性和产品产量.
- 证实了氧化 galaktomannan 的成功氨基化.
- 优化反应条件抑制了副产品的形成.
- 改造的SpATA突变,特别是那些具有氨酸替代物的突变,显示出更好的产品产量.
结论:
- 通过氧化酶-胺转氨酶级联建立了聚糖胺化的全酶性路径.
- 氨基转胺酶的低运行稳定性,由于PMP辅因子保留问题,限制了级联产量.
- 未来的酶工程应该专注于提高SpATA的辅助因子亲和力和操作稳定性,以提高过程可行性.
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