构象异构
化学
肌红蛋白
熔球
离子迁移光谱法
蛋白质折叠
折叠(DSP实现)
结晶学
蛋白质结构
构象集合
生物物理学
作者
Veena Shankar Avadhani,Supratim Mondal,Shibdas Banerjee
出处
期刊:Biochemistry
[American Chemical Society]
日期:2022-01-27
卷期号:61 (4): 303-309
标识
DOI:10.1021/acs.biochem.1c00743
摘要
In the past, many intensive attempts failed to capture or underestimated the copopulated intermediate conformers from the protein folding/unfolding reaction. We report a promising approach to kinetically trap, resolve, and quantify protein conformers that evolve during unfolding in solution. We conducted acid-induced unfolding of three model proteins (cytochrome c, myoglobin, and lysozyme), and the corresponding reaction aliquots upon decreasing the pH were electrosprayed for high field asymmetric waveform ion mobility spectrometry (FAIMS) measurements. The copopulated conformers were resolved, visualized, and quantified by a two-dimensional mapping of the FAIMS output. Contrary to expectations, all the above proteins appeared metamorphic (multiple-folded conformations) at the physiological pH, and cytochrome c exhibited an unusual "conformational shuttling" before forming the molten globule state. Thus, in contrast to many previous studies, a wide variety of thermodynamically stable intermediate conformers, including compact, molten globule, and partially unfolded forms, was trapped from solution, probing the unfolding mechanism in detail.
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