A dynein motor attachment complex regulates TGFß/Smad3 signaling.

A dynein motor attachment complex regulates TGFß/Smad3 signaling.
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DOI:
10.7150/ijbs.5718
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发表时间:
2013
影响因子:
9.2
通讯作者:
Mulder KM
Mulder KM
中科院分区:
生物学2区
文献类型:
--
作者:
Jin Q;Gao G;Mulder KM

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我们之前的结果表明 km23-2 在 TGFβ 信号传导中具有与 km23-1 不同的功能。在本报告中,我们证明了 km23-2 的阻断降低了人 Smad7 启动子 Smad7-Luc(一种内源性 Smad3 靶启动子)的 TGFβ 激活。基于发光的哺乳动物相互作用图谱 (LUMIER) 分析表明,相对于与 Smad2 的相互作用,TGFβ 优先刺激 km23-2 与 Smad3 的相互作用。尺寸排阻色谱实验表明,在 TGFβ 处理后,km23-2 和 Smad3 被招募到同一复合物中。此外,在存在 TGFβ 的情况下,但在不存在 TGFβ 的情况下,km23-2 与 TGFβ 受体 (TßRs) 和 Smad3 一起存在于早期内体中。总的来说,我们的数据表明 km23-2 是 Smad3 依赖性 TGFβ 信号通路中的关键信号传导中间体。我们还提供了新发现的证据,即 TGFβ 刺激 km23-2 二聚体快速招募到动力蛋白复合物的动力蛋白中间链 (DIC),而激酶缺陷形式的 TßRII 阻止了这种相互作用。最后,我们首次证明 TGFβ 不仅刺激动力蛋白运动附着复合物的组装,而且还触发 km23-2-Smad3 货物与其他动力蛋白组件的束缚。因此,我们的数据证明了 km23-2 作为运动受体的新功能,可以将 Smad3 招募到动力蛋白复合物进行细胞内运输,从而介导 Smad3 依赖性 TGFβ 信号传导。
Our previous results have demonstrated that km23-2 has functions in TGFß signaling that are distinct from those for km23-1. In the current report, we demonstrate that blockade of km23-2 decreased TGFß activation of the human Smad7 promoter Smad7-Luc, an endogenous Smad3-target promoter. Luminescence-based mammalian interaction mapping (LUMIER) analyses showed that TGFß stimulated the interaction of km23-2 preferentially with Smad3, relative to that with Smad2. Size exclusion chromatography experiments revealed that km23-2 and Smad3 were recruited into the same complex after TGFß treatment. Moreover, in the presence of TGFß, but not in the absence, km23-2 was present in early endosomes with the TGFß receptors (TßRs) and Smad3. Collectively, our data indicate that km23-2 is a critical signaling intermediate in a Smad3-dependent TGFß signaling pathway. We also provide evidence of the novel finding that TGFß stimulates the rapid recruitment of the km23-2 dimer to the dynein intermediate chain (DIC) of the dynein complex, whereas a kinase-deficient form of TßRII prevented this interaction. Finally, we demonstrate for the first time that TGFß stimulated not only assembly of the dynein motor attachment complex, but also triggered the tethering of the km23-2-Smad3 cargo to the other dynein components. Thus, our data demonstrate a novel function for km23-2 as a motor receptor to recruit Smad3 to the dynein complex for intracellular transport, thereby mediating Smad3-dependent TGFß signaling.
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