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相关概念视频

Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

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使用无损离子操纵结构的气相原生 (类似) 蛋白质的表征.

Jung Yun Lee1, Viraj D Gandhi1, Christopher Harrilal1

  • 1Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.

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概括

无损离子操纵的多通道结构 (SLIM) 增强了气相蛋白质分离,准确地确定了电荷状态依赖结构. 这一进步使新的原生离子移动性光谱应用成为可能.

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科学领域:

  • 分析化学 分析化学
  • 生物物理化学 生物物理化学
  • 分离科学 分离科学

背景情况:

  • 无损离子操纵结构 (SLIM) 在气相中提供高分辨率的离子分离.
  • 之前的SLIM应用程序专注于各种分子类,但蛋白质分析需要进一步开发.

研究的目的:

  • 调查多通路SLIM用于将气相蛋白质分离在接近原始状态下.
  • 分析电荷状态依赖的到达时间分布和蛋白质的结构变化.
  • 为了验证SLIM衍生的碰撞截面 (CCS) 值与漂流管离子运动谱学 (DTIMS) 相比.

主要方法:

  • 使用多通道SLIM分离用于碳酸无水酶 (CA),酒精脱酶 (ADH) 和阿波转移素.
  • 使用校准曲线与Agilent Tune Mix离子获得的实验CCS值.
  • 将多通道到达时间分布 (ATD) 解构为单通道值,用于CCS确定.
  • 将SLIM衍生的CCS值与DTIMS测量值进行比较.

主要成果:

  • 交流电荷状态的基线分离 (z=9+到11+) 通过8米单通SLIM实现.
  • 改善了ADH (z=23+到25+) 的移动性峰值分辨率,其延长路径长度高达24米.
  • 观察到从单模向多模CCS分布的apotransferrin (z=16+到18+) 的过渡.
  • 使用40米多通路分离,证明了特定电荷状态的选择性隔离 (例如,阿波转移蛋白z=17+).
  • SLIM分离对蛋白质结构和CCS值的影响最小.

结论:

  • 多通SLIM有效地将近原始状态的气相蛋白分离,解决电荷状态依赖的结构.
  • 该技术提供了与DTIMS相比的准确CCS值.
  • SLIM对移动性选择性隔离的能力为原生离子移动性应用和进一步基于SLIM的操纵开辟了道路.