论文标题

通过与聚合物表面活性剂的蛋白质结合蛋白质抑制淀粉样蛋白样聚集

Inhibiting amyloid-like aggregation through bio-conjugation of proteins with polymer surfactant

论文作者

Mukhopadhyay, Anasua, Stoev, Iliya D., King, David A., Sharma, Kamendra P., Eiser, Erika

论文摘要

预防蛋白质聚集并因此稳定蛋白质具有很大的生物学和生物技术意义。在这里,我们表明,在选择作为模型蛋白的聚合物表面活性剂和牛血清白蛋白(BSA)的化学计量结合物中,可以抑制淀粉样蛋白样聚集体。我们使用硫氟-t荧光光谱,动态光散射和FTIR光谱的组合研究了聚合物表面活性剂改性和未修饰(天然)BSA溶液中的聚集行为。在聚集条件下,BSA聚合物表面活性剂共轭物最高可达5天,而天然BSA则形成淀粉样蛋白原纤维结构。此外,对经过热处理的100至200μm天然BSA聚集体进行的基于DLS的微侵蚀研究提供了对在非常大的频率范围内对平衡弹性和粘性模量的了解,并使用Bulk Sheology无法访问MHz。我们的结果表明,在聚集6天后,弹性模量显示了1.2至3.6 pa之间的值,对应于105 nm的纠缠长度(ξ)。有趣的是,在塑料eppendorf中以65度C在65度C中加热200μm的BSA溶液导致自动摄影。这些膜表现出强烈的Tht荧光强度和FTIR研究的主要\ B {eta} - sheet次级结构,这表明淀粉样蛋白原纤维的分层自组件产生的自动性微观结构。

Prevention of protein aggregation and thus stabilization of proteins has large biological and biotechnological implications. Here, we show that inhibition of amyloid-like aggregates is possible in stoichiometric conjugates of polymer surfactant and bovine serum albumin (BSA) chosen as a model protein. We investigate using a combination of Thioflavin-T fluorescence spectroscopy, dynamic light scattering and FTIR spectroscopy the aggregation behavior in polymer surfactant modified and unmodified (native) BSA solutions. The BSA-polymer surfactant conjugates are stable up to 5 days under aggregation conditions, while native BSA forms amyloid fibrillar structures. Further, DLS-based micro-rheology studies performed with heat-treated 100 to 200 μM native BSA aggregates provided understanding of the equilibrium elastic and viscous moduli over a very large frequency range, reaching MHz, which are inaccessible using bulk rheology. Our results indicate that after 6 days of aggregation conditions, elastic moduli showed values between 1.2 to 3.6 Pa corresponding to an entanglement length (ξ) of 105 nm. Interestingly, heating 200 μM native BSA solution at 65 degree C for 2 days in a plastic Eppendorf resulted in self-standing films. These films exhibited strong ThT-fluorescence intensity and a predominant \b{eta}-sheet secondary structure from the FTIR studies, suggesting that self-standing microstructure resulted from hierarchical self-assembly of amyloid fibrils.

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