一种含有空腔的T4溶酶突变体被埋藏的基稳定
A E Eriksson1, W A Baase, J A Wozniak
1Institute of Molecular Biology, Howard Hughes Medical Institute, University of Oregon, Eugene 97403.
Nature
|January 23, 1992
概括
蛋白质工程可以为配体结合创建内部腔. 在T4溶酶中用氨酸替换白氨酸,形成了一个结的腔,增加了蛋白质的化温度.
科学领域:
- 蛋白质工程是指蛋白质工程.
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 蛋白质疏水核通常是密集密封的,空的空间最小.
- 突变用较小的残留物取代重的残留物,可以在蛋白质核中引入空洞.
- 腔体的特征取决于当地的蛋白质结构,先前存在的空隙和结构放松.
研究的目的:
- 为了研究工程蛋白质腔的可行性,用于特定的连接体结合.
- 为了描述与T4溶酶中设计的空腔的结合.
- 评估联结对蛋白质稳定性的影响.
主要方法:
- 结晶学分析以确定蛋白质结构和空洞形成.
- 热力学分析用于测量蛋白质化温度在连接物结合后的变化.
- 局部导向的突变发生,以产生特定的氨基酸替代物 (Leu99Ala,Phe153Ala).
主要成果:
- 在T4溶酶中由Leu99Ala替代形成的腔体足够大以结合.
- 与工程腔的结合使蛋白质的化温度在pH值3.0时增加了6.0°C.
- 由Phe153Ala替代产生的空洞没有结合,突出了特异性.
结论:
- 蛋白质腔可以故意设计,以容纳特定的小分子.
- 工程腔可以通过带结合来提高蛋白质的稳定性.
- 这项研究证明了为定向分子识别和功能量身定制蛋白质内部的潜力.
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