当前位置: X-MOL 学术Biochemistry › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Extraordinarily Stable Amyloid Fibrils Engineered from Structurally Defined β-Solenoid Proteins
Biochemistry ( IF 2.9 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acs.biochem.7b00364
Zeyu Peng 1 , Maria D. R. Peralta 1 , Michael D. Toney 1
Affiliation  

The self-assembly of biological molecules into ordered nanostructures is an attractive method for fabricating novel nanomaterials. Nucleic acid-based nanostructures suffer from limitations to functionalization and stability. Alternatively, protein-based nanostructures have advantageous chemical properties, but design facility lags behind that of nucleic acids. Structurally defined fibrils engineered from β-solenoid proteins (BSPs) form under mild conditions [Peralta, M. D. R., et al. (2015) ACS Nano 9, 449–463] and are good candidates for novel nanomaterials because of the defined sequence-to-structure relationship and tunable properties. Here, the stability of two types of engineered fibrils was examined using circular dichroism spectroscopy, transmission electron microscopy, and electrophoresis. Both are stable to at least 90 °C, and one survives autoclaving. They are stable toward organic solvents, urea, and pH extremes. One is even stable in 2% sodium dodecyl sulfate with heating. The fibrils show variable resistance to proteolytic digestion: one is resistant to trypsin, but chymotrypsin and proteinase K degrade both. These results show that BSPs have excellent potential for bottom-up design of rugged, functional, amyloid-based nanomaterials.

中文翻译:

由结构确定的β-电磁蛋白改造而成的极其稳定的淀粉样蛋白原纤维

将生物分子自组装成有序的纳米结构是制造新型纳米材料的一种有吸引力的方法。基于核酸的纳米结构遭受功能化和稳定性的限制。或者,基于蛋白质的纳米结构具有有利的化学性质,但设计设施落后于核酸。由β-电磁蛋白(BSP)改造而成的结构明确的原纤维在温和条件下形成[Peralta,MDR,et al。(2015年)ACS Nano 9(449-463),并且由于定义的序列与结构的关系和可调特性,它们是新型纳米材料的良好候选者。在这里,使用圆二色光谱,透射电子显微镜和电泳检查了两种类型的工程纤维的稳定性。两者在至少90°C的温度下都稳定,并且其中一个可以承受高压灭菌。它们对有机溶剂,尿素和极端pH值均稳定。一种甚至在加热下在2%十二烷基硫酸钠中稳定。所述原纤维对蛋白水解消化显示出可变的抗性:一个对胰蛋白酶具有抗性,但是胰凝乳蛋白酶和蛋白酶K两者均降解。这些结果表明,BSP在坚固,功能性,基于淀粉样蛋白的纳米材料的自下而上设计方面具有极好的潜力。
更新日期:2017-11-03
down
wechat
bug