Binding of thermo-sensitive and pH-sensitive butylated poly(allylamine)s with lysozyme

Binding of thermo-sensitive and pH-sensitive butylated poly(allylamine)s with lysozyme
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热敏和 pH 敏感丁基化聚(烯丙胺)与溶菌酶的结合

DOI:
10.1007/s10118-011-1054-6
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发表时间:
2011-04
影响因子:
4.3
通讯作者:
姚萍
姚萍
中科院分区:
化学2区
文献类型:
--
作者:
姚萍

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制备了丁基取代度为15%~ 70%的丁基改性聚烯丙基胺。聚合物具有pH敏感性和低临界溶解温度(LCST)行为。丁基化度高的聚合物在较低的温度、较低的pH值和较低的聚合物浓度下出现LCST。天然溶菌酶与聚合物的结合取决于在蛋白质和聚合物携带相同正电荷的pH范围内聚合物的疏水性。聚合物疏水性的增加可以增加与溶菌酶的结合,但聚合物的自聚集降低了与溶菌酶的结合。结合的溶菌酶分子在复合物解离后可以完全恢复其天然活性。与天然溶菌酶相比,变性后的溶菌酶暴露出疏水残基,可以增加与聚合物的结合,形成稳定的复合纳米颗粒。
Butyl modified poly(allylamine)s with butyl substitution degrees of 15% to 70% were prepared. The polymers show pH sensitive property and lower critical solution temperature (LCST) behavior. The LCST appears at lower temperature, lower pH and lower polymer concentration for the polymer with higher butylated degree. The binding of native lysozyme with the polymers depends on the hydrophobicity of the polymers at the pH range that the protein and the polymer carry the same positive charges. The increase of polymer hydrophobicity can increase the binding with lysozyme, but the self-aggregation of the polymer decreases the binding. The bound lysozyme molecules can recover their native activity completely after the dissociation of the complexes. Compared with native lysozyme, the denatured one which exposes the hydrophobic residues can increase the binding with the polymer and form stable complex nanoparticles.
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