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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Nucleotide Binding and Active Site Gate Dynamics for the Hsp90 Chaperone ATPase Domain from Benchtop and High Field F-19 NMR Spectroscopy
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Nucleotide Binding and Active Site Gate Dynamics for the Hsp90 Chaperone ATPase Domain from Benchtop and High Field F-19 NMR Spectroscopy

机译:HSP90伴侣ATP酶从台式和高场F-19 NMR光谱学的HSP90伴侣ATP酶域的核苷酸结合和活性位点动态

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摘要

Protein turnover in cells is regulated by the ATP dependent activity of the Hsp90 chaperone. In concert with accessory proteins, ATP hydrolysis drives the obligate Hsp90 dimer through a cycle between open and closed states that is critical for assisting the folding and stability of hundreds of proteins. Cycling is initiated by ATP binding to the ATPase domain, with the chaperone and the active site gates in the dimer in open states. The chaperone then adopts a short-lived, ATP bound closed state with a closed active site gate. The structural and dynamic changes induced in the ATPase domain and active site gate upon nucleotide binding, and their impact on dimer closing are not well understood. We site-specifically (19)Flabeled the ATPase domain at the active site gate to enable benchtop and high field F-19 NMR spectroscopic studies. Combined with MD simulations, this allowed accurate characterization of pico- to nanosecond time scale motions of the active site gate, as well as slower micro- to millisecond time scale processes resulting from nucleotide binding. ATP binding induces increased flexibility at one of the hinges of the active site gate, a necessary prelude to release of the second hinge and eventual gate closure in the intact chaperone.
机译:细胞中的蛋白质转换由HSP90伴侣酮的ATP依赖性活性调节。在辅助蛋白的音乐会中,ATP水解通过开放和封闭状态之间的循环驱动了迫使的HSP90二聚体,这对于辅助数百种蛋白质的折叠和稳定性至关重要。通过ATP与ATPase结构域的ATP结合引发循环,伴侣酮和在开放状态下的二聚体中的活性位点栅极。然后伴侣伴侣采用短寿命的ATP束缚闭合状态,带有封闭的活动场地门。在核苷酸结合时,在ATP酶结构域和活性位点栅中诱导的结构和动态变化及其对二聚体闭合的影响尚不清楚。我们的网站 - 特别是(19)将ATPase域镶嵌在活动场地门处,以使得能够高压和高场F-19 NMR光谱研究。结合MD仿真,这允许精确表征了活性位点栅极的微微纳入纳秒时间尺度运动,以及由核苷酸结合引起的微量达毫秒的时间尺度过程。 ATP绑定在有源位点栅极的一个铰链中引起增加的灵活性,该铰链的铰链是在完整的伴侣中释放第二铰链和最终栅极封闭的必要前列。

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