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结构引导的道工程揭示了糖链延伸的分子基础

Dawei Ni^1,2, Zhaolin Huang^1,2, Shuqi Zhang^1,2

¹State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, China.

Journal of agricultural and food chemistry

|June 16, 2025

概括

来自乳杆菌的胰岛素糖酶 (IS) 产生胰岛素. 这项研究揭示了关键的残留物和一种用于控制多糖和寡糖合成的新型分流机制,从而使定制的果糖工程成为可能.

科学领域:

酵素学和葡萄糖生物学
生物化学和结构生物学
微生物生物技术微生物生物技术

背景情况:

胰岛素糖酶 (IS) 对于合成胰岛素至关重要,胰岛素是一种具有多种应用和健康益处的多糖体.
乳杆菌IS独特地产生高分子量多糖和寡糖.
了解IS机制对于定制胰岛素链长度和特性至关重要.

研究的目的:

为了阐明由 Lactobacillus inulosucrase 延长糖链的机制.
为了确定特定的氨基酸残留物控制多糖与寡糖合成.
为工程GH68酶提供基础,用于定制的果生产.

主要方法:

来自*Lactobacillus reuteri*的野生类型和突变IS的晶体结构确定 121.
以结构为指导的合理设计和突变发生,以确定关键残留物.
模拟分子动力学以研究酶机制.

主要成果:

晶体结构揭示了IS催化口袋内的独特的C端延伸.
特定的残留物 (Tyr695, Asn303, Asn305, Asn367, Gln369, Asn419) 对于聚糖化合物的合成至关重要.
其他残留物 (Arg544,Tyr618,Arg622) 对寡糖化合物合成至关重要.
提出了一种用于合成多糖和寡糖的新型变流机制.

结论:

获得了关于IS的胰岛素链延长机制的基本见解.
特定的残留物决定了产生的果糖类型 (多糖与寡糖).
这项研究为设计IS和相关GH68酶用于向果糖合成提供了理论基础.

关键词:

酸糖酶是什么? 酸糖酶是什么酸糖酶是什么莱万斯克拉塞斯 (Levansucrase) 是一个名字.摆动机制的摆动机制.糖链的延伸糖链的延伸这是一个道道道.

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