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质谱完整过渡表位图谱绘制方法支持折叠形形变体的蛋白质工程

Cornelia Koy¹, Timo Zimmer², Kwabena F M Opuni³

¹Proteome Center Rostock, Medical Faculty and Natural Science Faculty, University of Rostock, Schillingallee 69, 18057, Rostock, Germany.

Scientific reports

|November 22, 2025

概括

T4纤维素折叠体 (T4Ff) 迷你蛋白质的蛋白质工程揭示了芳香的π堆叠稳定了trimers. 这一发现增强了对蛋白质稳定性和通过氨基酸修饰的相互作用的理解.

科学领域:

生物化学生物化学
结构生物学结构生物学
蛋白质工程是指蛋白质工程.

背景情况:

T4纤维素折叠体 (T4Ff) 迷你蛋白质是研究蛋白质与蛋白质相互作用的宝贵工具.
蛋白质工程允许修改主要结构以影响更高阶蛋白质结构.

研究的目的:

调查大π电子环的非自然N端氨基酸残留如何影响T4Ff三元体稳定性.
了解芳香 π 堆叠在稳定蛋白质结构中的作用.

主要方法:

T4Ff变种的蛋白质工程.
质谱ITEM-FIVE分析以确定三元体解离的动力和准热力学特性.
蛋白质复合体稳定性的气相分析.

主要成果:

发现芳香的π堆叠可以稳定T4Ff变体的同型三元体.
与原来的T4Ff相比,内链氨基酸交换降低了三元体的稳定性.
在特定变体中,三元体解离的激活度显著下降,但被N端芳香残留物抵消.
一种带有二氨基酸侧链的变体表现出比原始T4Ff稍高的稳定性.

结论:

芳香的π堆叠是T4Ff修剪器的一个关键稳定力.
ITEM-FIVE分析对于在氨基酸残留水平上量化非共价力是有效的.
涉及芳香残留的蛋白质工程策略可以调节蛋白质的稳定性和相互作用.

关键词:

结合强度分析的分析 ITEM质谱测量质谱仪非共价复合体是非共价复合体.蛋白质工程是一种蛋白质工程.在T4Ff的折叠变体中.纳米ESI-MSMS 的使用方法

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