通过蛋白质与高分子表面活性剂的生物缀合抑制淀粉样蛋白聚集
Inhibiting amyloid-like aggregation through bio-conjugation of proteins with polymer surfactant
摘要：
防止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，抑制淀粉样聚集体是可能的化学计量共轭聚合物表面活性剂和牛血清白蛋白（BSA）选择作为模型蛋白。我们使用硫磺素-T的荧光光谱，动态光散射和FTIR光谱的聚合物表面活性剂改性和未改性（本地）BSA溶液中的聚集行为相结合的调查。BSA-聚合物表面活性剂缀合物在聚集条件下稳定长达5天，而天然BSA形成淀粉样蛋白纤维状结构。此外，使用热处理的100至200 μM天然BSA聚集体进行的基于DLS的微观流变学研究提供了在非常大的频率范围内（达到MHz）的平衡弹性和粘性模量的理解，这是使用本体流变学无法达到的。我们的研究结果表明，经过6天的聚集条件，弹性模量显示值在1.2至3.6帕之间，对应于105纳米的缠结长度（λ）。有趣的是，在塑料Eppendorf中将200 μM天然BSA溶液在65 ℃下加热2天，得到自立膜。这些薄膜表现出强ThT-荧光强度和一个主要的\b{eta} -片层二级结构的FTIR研究，这表明，自立的微观结构导致分级自组装的淀粉样蛋白原纤维。
英文摘要：
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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