Generation of Ca2+-independent sortase A mutants with enhanced activity for protein and cell surface labeling.

Generation of Ca2+-independent sortase A mutants with enhanced activity for protein and cell surface labeling.
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DOI:
10.1371/journal.pone.0189068
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Dougan SK
Dougan SK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jeong HJ;Abhiraman GC;Story CM;Ingram JR;Dougan SK

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山梨酸酶A是一种来源于金黄色葡萄球菌的钙依赖转肽酶,广泛应用于荧光染料和其他部分与蛋白质或真核细胞表面的偶联。在体内和基于细胞的应用中,由于钙浓度范围很大,以及生命系统中蛋白质-蛋白质相互作用的瞬变性质,分类酶的应用受到了一定的限制。为了将分类酶A用于细胞标记应用,我们通过组合多个突变来产生一种新的分类酶A变体,以产生一种既不依赖钙又具有高活性的酶。该变异体增强了N-末端和C-末端标记的活性,以及在生理条件下对细胞表面的修饰。
Sortase A, a calcium-dependent transpeptidase derived from Staphylococcus aureus, is used in a broad range of applications, such as the conjugation of fluorescent dyes and other moieties to proteins or to the surface of eukaryotic cells. In vivo and cell-based applications of sortase have been somewhat limited by the large range of calcium concentrations, as well as by the often transient nature of protein-protein interactions in living systems. In order to use sortase A for cell labeling applications, we generated a new sortase A variant by combining multiple mutations to yield an enzyme that was both calcium-independent and highly active. This variant has enhanced activity for both N- and C-terminal labeling, as well as for cell surface modification under physiological conditions.
使用(18)F-2-氟脱氧葡萄糖(FDG)将胰腺癌免疫细胞的抗体片段标记。
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