Crystal structure of human myosin 1c--the motor in GLUT4 exocytosis: implications for Ca2+ regulation and 14-3-3 binding.

Crystal structure of human myosin 1c--the motor in GLUT4 exocytosis: implications for Ca2+ regulation and 14-3-3 binding.
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人肌球蛋白 1c 的晶体结构——GLUT4 胞吐作用的马达:对 Ca2 调节和 14-3-3 结合的影响

DOI:
10.1016/j.jmb.2014.03.004
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发表时间:
2014
影响因子:
5.6
通讯作者:
Manstein DJ
Manstein DJ
中科院分区:
生物学2区
文献类型:
--
作者:
S. Münnich;Taft MH;Manstein DJ

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肌球蛋白1c(Myo 1c)在支持细胞迁移、囊泡运输、胰岛素刺激的葡萄糖摄取和听力的基础运动事件中起关键作用。在这里,我们提出的晶体结构的人Myo 1c电机复杂的轻链钙调蛋白。我们的结构揭示了紧密的相互作用的运动域与钙调素绑定到第一个IQ图案在颈部区域。几个钙调素残基有助于这种相互作用也参与钙离子结合。马达结构域中的接触残基与中央β折叠和HO螺旋连接,表明颈部区域中的Ca 2+结合变化与马达结构域的肌动蛋白和核苷酸结合区域的通信机制。Myo 1c突变的结构背景和化学环境,参与人类感音神经性听力损失的描述和运动功能的影响进行了讨论。我们发现,由Myo 1c的运动结构域和第一个IQ基序组成的构建体足以与14-3-3β(KD= 0.9 μM)建立紧密的相互作用,并提出了双头Myo 1c-14-3-3复合物的模型。该复合物与胰岛素刺激的葡萄糖摄取过程中葡萄糖转运蛋白4储存囊泡的胞吐作用有关。
Myosin 1c (Myo1c) plays a key role in supporting motile events that underlie cell migration, vesicle trafficking, insulin-stimulated glucose uptake and hearing. Here, we present the crystal structure of the human Myo1c motor in complex with its light chain calmodulin. Our structure reveals tight interactions of the motor domain with calmodulin bound to the first IQ motif in the neck region. Several of the calmodulin residues contributing to this interaction are also involved in Ca2 +binding. Contact residues in the motor domain are linked to the central β-sheet and the HO helix, suggesting a mechanism for communicating changes in Ca2 +binding in the neck region to the actin and nucleotide binding regions of the motor domain. The structural context and the chemical environment of Myo1c mutations that are involved in sensorineural hearing loss in humans are described and their impact on motor function is discussed. We show that a construct consisting of the motor domain of Myo1c and the first IQ motif is sufficient to establish a tight interaction with 14-3-3β (KD= 0.9 μM) and present the model of a double-headed Myo1c–14-3-3 complex. This complex has been implicated in the exocytosis of glucose transporter 4 storage vesicles during insulin-stimulated glucose uptake.
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