Semi-Rigid Nitroxide Spin Label for Long-Range EPR Distance Measurements of Lipid Bilayer Embedded β-Peptides
作者:Janine Wegner、Gabriele Valora、Karin Halbmair、Annemarie Kehl、Brigitte Worbs、Marina Bennati、Ulf Diederichsen
DOI:10.1002/chem.201805880
日期:2019.2.11
sparse number of β‐peptide spin labels. Its performance was evaluated by investigating the helical turn of a 314‐helical transmembrane model β‐peptide. Nanometer distances between two incorporated β3‐hTOPP labels in different environments were measured by using pulsed electron/electron double resonance (PELDOR/DEER) spectroscopy. Due to the semi‐rigid conformational design, the label delivers reliable
β-肽基于其构象稳定和定义明确的二级结构,是一类有趣的跨膜模型肽。在此,我们提出了顺磁性β氨基酸的合成β 3 -hTOPP(4-(3,3,5,5-四甲基-2,6-二氧代-4- oxylpiperazin -1-基) - d -β 3 -高苯甘氨酸),可通过EPR光谱法研究β肽。迄今为止,这种氨基酸增加了β肽旋转标记的稀疏性。通过研究3 14螺旋跨膜模型β肽的螺旋转角来评估其性能。两者之间的距离纳米并入β 3通过使用脉冲电子/电子双共振(PELDOR / DEER)光谱仪测量了不同环境中的hTOPP标签。由于采用半刚性构象设计,即使在脂质双层中,该标签也可提供可靠的距离和清晰的(单峰)距离分布。结果表明,研究的β-肽折叠成3.25 14螺旋,并在脂质双层中保持这种构象。