Exploring weak, transient protein--protein interactions in crowded in vivo environments by in-cell nuclear magnetic resonance spectroscopy.
Exploring weak, transient protein--protein interactions in crowded in vivo environments by in-cell nuclear magnetic resonance spectroscopy.
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探索弱,瞬态蛋白 - 通过细胞核磁共振光谱谱图在拥挤的体内环境中的蛋白质相互作用。
DOI:
10.1021/bi201287e
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发表时间:
2011-11-01
期刊:
影响因子:
2.9
通讯作者:
Gierasch LM
中科院分区:
文献类型:
--
作者:
Wang Q;Zhuravleva A;Gierasch LM
Biology relies on functional interplay of proteins in the crowded and heterogeneous environment inside cells, and functional protein interactions are often weak and transient. Thus, methods are needed that preserve these interactions and provide information about them. In-cell NMR spectroscopy is an attractive method to study a protein’s behavior in cells because it may provide residue-level structural and dynamic information. Yet several factors limit the feasibility of protein NMR spectroscopy in cells, and among them slow rotational diffusion has emerged as the most important. In this paper, we seek to elucidate the causes of the dramatically slow protein tumbling in cells and in so doing to gain insight into how the intracellular viscosity and weak, transient interactions modulate protein mobility. To address these questions, we characterized the rotational diffusion of three model globular proteins in E. coli cells using 2D heteronuclear NMR spectroscopy. These proteins have a similar molecular size and globular fold, but very different surface properties, and indeed, they show very different rotational diffusion in the E. coli intracellular environment. Our data are consistent with an intracellular viscosity approximately eight times that of water—too low to be a limiting factor to observing small globular proteins by in-cell NMR spectroscopy. Thus, we conclude that transient interactions with cytoplasmic components significantly and differentially affect the mobility of proteins and therefore their NMR detectability. Moreover, we suggest that an intricate interplay of total protein charge and hydrophobic interactions plays a key role in regulating these weak intermolecular interactions in cells.
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影响因子:
2.9
作者:
Barnes, Christopher O.;Pielak, Gary J.
通讯作者:
Pielak, Gary J.
影响因子:
3.4
作者:
Kumar, Mohit;Mommer, Mario S.;Sourjik, Victor
通讯作者:
Sourjik, Victor
DOI:
10.1073/pnas.1009392108
发表时间:
2011-03-08
影响因子:
11.1
作者:
Heo, Muyoung;Maslov, Sergei;Shakhnovich, Eugene
通讯作者:
Shakhnovich, Eugene
影响因子:
5.6
作者:
Byeon, IJL;Louis, JM;Gronenborn, AM
通讯作者:
Gronenborn, AM
影响因子:
15
作者:
Li C;Pielak GJ
通讯作者:
Pielak GJ