植物衍生蛋白质联体的合理设计具有改变基质特异性的基质特异性
Yan Zhou1, Simon J de Veer1, Tristan J Tyler1
1Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane QLD 4072, Australia.
Biochemistry
|February 18, 2026
概括
研究人员通过改变一个关键的氨酸残留物来设计出对蛋白质修饰至关重要的氨基酶. 这种修改成功地扩大了它们的基质特异性,用于各种应用,如蛋白质标记和循环.
科学领域:
- 生物化学 生物化学
- 蛋白质工程是指蛋白质工程.
- 酶学 是一种酶学.
背景情况:
- 阿斯帕拉基尼尔连接酶是催化特定位点转反应的酶.
- 工程工作已经提高了酶效率,但修改基质特异性仍然具有挑战性.
- S2'口袋的氨酸残留物与基质特异性有关.
研究的目的:
- 为了设计具有改变基质特异性的阿斯巴拉基尼尔连接酶.
- 为了研究保存的S2′氨酸残留在基质特异性中的作用.
- 在蛋白质工程应用中扩大阿斯巴拉基尼尔结合酶的实用性.
主要方法:
- 在asparaginyl结合酶 (VyPAL2和butelase1) 中保存的氨酸残留物的位点定向突变发生.
- 使用各种和蛋白质基质评估工程酶的基质范围.
- 评估突变酶在循环,蛋白质-蛋白质结合和N端蛋白质标记中的性能.
主要成果:
- 在VyPAL2和布泰拉酶1中S2'氨酸残留物的突变成功改变了它们的基质特异性.
- 工程结合酶证明了对循环,蛋白质-蛋白质结合和N端蛋白质标记的基质的增强处理.
- 保存的S2'氨酸残留被证实是阿斯帕拉基尼尔结合酶中基质特异性的一般决定因素.
结论:
- 氨酸S2'残留物是不同植物家族中阿斯巴拉基尼尔结合酶基质特异性的关键决定因素.
- 这种残留物提供了一个可行的策略,用于扩大阿斯巴拉基尼尔连接酶的基质范围.
- 这些发现有助于为先进的蛋白质工程开发更通用的阿斯巴拉基尼尔连接酶.
相关概念视频
00:49Ligand Binding and Linkage
5.7K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
5.7K
02:40Ligand Binding Sites
15.3K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
15.3K
02:53Conservative Site-specific Recombination and Phase Variation
6.9K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.9K
01:19Allosteric Proteins-ATCase
6.7K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
6.7K