Design and characterization of structured protein linkers with differing flexibilities.

Design and characterization of structured protein linkers with differing flexibilities.
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DOI:
10.1093/protein/gzu043
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发表时间:
2014-10
期刊:
Protein engineering, design & selection : PEDS
影响因子:
--
通讯作者:
Bjorkman PJ
Bjorkman PJ
中科院分区:
其他
文献类型:
--
作者:
Klein JS;Jiang S;Galimidi RP;Keeffe JR;Bjorkman PJ

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含有通过肽或蛋白质接头连接的两个或更多个功能多肽的工程化融合蛋白对于许多生物学研究领域是重要的。功能单元之间的间隔距离可以影响表位接近和以亲合力结合的能力;因此,具有不同长度和刚性程度的各种接头的可用性对于蛋白质设计工作将是有价值的。在这里,我们报告了一系列设计的结构化蛋白质连接器,将天然存在的蛋白质结构域,并比较它们的特性,常用的Gly 4Ser重复连接器。当掺入免疫球蛋白G(IgG)分子的铰链区时,与包括更刚性结构域(如β2-微球蛋白、Zn-α2-糖蛋白和三肽重复序列)的接头相比,柔性Gly 4Ser重复序列不会导致IgG抗原结合结构域的可检测延伸。本研究将具有不同长度和刚性的额外一组接头添加到可用的接头库中,其可用于构建具有增强的结合特性的抗体或其他融合蛋白。
Engineered fusion proteins containing two or more functional polypeptides joined by a peptide or protein linker are important for many fields of biological research. The separation distance between functional units can impact epitope access and the ability to bind with avidity; thus the availability of a variety of linkers with different lengths and degrees of rigidity would be valuable for protein design efforts. Here, we report a series of designed structured protein linkers incorporating naturally occurring protein domains and compare their properties to commonly used Gly4Ser repeat linkers. When incorporated into the hinge region of an immunoglobulin G (IgG) molecule, flexible Gly4Ser repeats did not result in detectable extensions of the IgG antigen-binding domains, in contrast to linkers including more rigid domains such as β2-microglobulin, Zn-α2-glycoprotein and tetratricopeptide repeats. This study adds an additional set of linkers with varying lengths and rigidities to the available linker repertoire, which may be useful for the construction of antibodies with enhanced binding properties or other fusion proteins.
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