拓重编程将一个完整的膜寡糖转移酶转化为水溶性糖化催化剂
bioRxiv : the preprint server for biology
|February 9, 2026
概括
蛋白质工程方法SIMPLEx和WRAPs成功地创造了具有挑战性的GT-C折叠酶Cj PglB的水溶性变体. 这些方法可以有效地表达和功能性研究复杂的糖系转移酶合成糖生物学的.
科学领域:
- 生物化学 生物化学
- 蛋白质工程是指蛋白质工程.
- 合成葡萄糖生物学 合成葡萄糖生物学
背景情况:
- 葡萄糖转移酶 (GTs) 对于合成葡萄糖和葡萄糖结合物至关重要.
- 许多GT的重组表达,特别是具有跨膜区域的GT-C折叠酶,具有挑战性.
- 对GT的结构和功能洞察力受到表达困难的限制.
研究的目的:
- 为了设计GT-C折叠酶的水溶性变体,来自Campylobacter jejuni (Cj PglB) 的寡糖转移酶PglB.
- 为了克服复杂的膜相关GTs的复合表达挑战.
- 为了实现详细的分子表征,并扩大GT在合成糖生物学中的应用.
主要方法:
- 采用了两个蛋白质工程策略:SIMPLEx (通用) 和WRAP (定制).
- 工程化Cj PglB的水溶性变体,一种具有13个跨膜螺旋体的酶.
- 在大肠杆菌的细胞质中表达的工程变异.
主要成果:
- 无论是SIMPLEx还是WRAP,都成功地产生了水溶性Cj PglB变体.
- 在没有洗剂的情况下获得高表达产量 (3-6 mg/L).
- 溶解后的变种保留了它们的催化功能.
结论:
- SIMPLEx和WRAP是表达和描述复杂GT的有效平台.
- 这些方法有助于研究具有挑战性的GT-C折叠酶.
- 允许GT在合成糖生物学和糖工程中得到更广泛的应用.
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