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Avidin-adsorbed peptide–calcium phosphate composites exhibiting high biotin-binding activity†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-11-19 00:00:00 , DOI: 10.1039/c8nj05024d
Suzuka Kojima 1, 2, 3, 4, 5 , Fukue Nagata 5, 6, 7 , Masahiko Inagaki 5, 6, 7 , Shinichi Kugimiya 1, 2, 3, 4, 5 , Katsuya Kato 5, 6, 7
Affiliation  

Techniques harnessing the strong interactions of the avidin–biotin system are frequently used in biosensing and protein separation. Hydroxyapatite (Ca10(PO4)6(OH)2, HAp) is a calcium phosphate compound known to have a strong affinity for various proteins. In this study, the adsorption ability of avidin on composites and its binding activity to biotin were investigated using two types of poly(L-glutamic acid)-containing calcium phosphate composites (pGlu-HAp). The morphologies of pGlu-HAp including poly(α-glutamic acid) and poly(γ-glutamic acid) showed plate-like and sheet-like particles, respectively, due to the effects of the peptide structure. Furthermore, these particles exhibited the high adsorption capacity of avidin; the maximum adsorption amounts for poly(α-glutamic acid)-HAp and poly(γ-glutamic acid)-HAp were 776 and 302 μg mg−1 HAp, respectively. In addition, the equilibrium data for the adsorption of avidin on two pGlu-HAp-fitted Langmuir isotherm models correspond to a monolayer. The difference in the amount of adsorbed avidin on the two pGlu-HAp composites was influenced by the density of the carboxyl groups in pGlu-HAp. This revealed that avidin adsorbed on pGlu-HAp was able to bind four biotin molecules, and biotinylated protein was separated from protein mixtures by avidin-adsorbed pGlu-HAp. These results indicate that these particles would be appropriate in the development of biosensing and bioseparation tools.

中文翻译:

亲和素吸附的肽-磷酸钙复合物表现出高的生物素结合活性

利用抗生物素蛋白-生物素系统的强大相互作用的技术经常用于生物传感和蛋白质分离。羟基磷灰石(Ca 10(PO 46(OH)2,HAp)是一种磷酸钙化合物,已知对多种蛋白质具有很强的亲和力。在这项研究中,使用两种类型的聚(L)研究了抗生物素蛋白在复合材料上的吸附能力及其与生物素的结合活性。-谷氨酸)-磷酸钙复合材料(pGlu-HAp)。由于肽结构的影响,包括聚(α-谷氨酸)和聚(γ-谷氨酸)的pGlu-HAp的形态分别显示出板状和片状颗粒。此外,这些颗粒显示出高的抗生物素蛋白吸附能力。聚(α-谷氨酸)-HAp和聚(γ-谷氨酸)-HAp的最大吸附量分别为776和302μgmg -1HAp,分别。另外,在两个pGlu-HAp拟合的Langmuir等温模型上,抗生物素蛋白吸附的平衡数据对应于一个单层。两种pGlu-HAp复合材料中抗生物素蛋白吸附量的差异受pGlu-HAp中羧基密度的影响。这表明吸附在pGlu-HAp上的抗生物素蛋白能够结合四个生物素分子,并且通过抗生物素蛋白吸附的pGlu-HAp从蛋白混合物中分离出生物素化的蛋白质。这些结果表明,这些颗粒将适用于生物传感和生物分离工具的开发。
更新日期:2018-11-19
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