Evidence that dynamin-2 functions as a signal-transducing GTPase.

Evidence that dynamin-2 functions as a signal-transducing GTPase.
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DOI:
10.1083/jcb.150.1.145
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发表时间:
2000-07-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Damke H
Damke H
中科院分区:
其他
文献类型:
--
作者:
Fish KN;Schmid SL;Damke H

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动力蛋白GTP酶在受体介导的内吞作用中的调节作用已经得到了很好的证实。在这里,我们提出了新的证据,普遍表达的亚型动力蛋白-2(Dyn2)也可以在信号转导途径中发挥作用(S)。当Dyn2的≤水平相对于内源性水平增加5倍时,就会激活转录因子P53并诱导细胞凋亡,表现为细胞增殖减少、DNA片段化和Caspase-3激活。Dy2触发的细胞凋亡只发生在分裂细胞中,并且依赖于P53。GTP结合缺陷的突变不会引发细胞凋亡,这表明激活P53的信号转导需要dyn2·GTP水平的增加,而不是蛋白质本身的水平。缺失COOH末端的Pro/Arg富含结构域(PRD)的截短dyn2与许多含有SH3结构域的伙伴相互作用,参与内吞作用和信号转导,比野生型更有效地触发细胞凋亡。这一观察结果为NH2末端GTPase结构域对细胞凋亡表型的重要性提供了额外的支持。所有描述的效应都是dyn2特有的,因为dyn1的200倍过度表达没有任何影响。dyn1是70%相同的神经元亚型。我们的数据表明,dyn2可以作为一个信号转导GTP酶来影响转录调控。
The role of dynamin GTPases in the regulation of receptor-mediated endocytosis is well established. Here, we present new evidence that the ubiquitously expressed isoform dynamin-2 (dyn2) can also function in a signal transduction pathway(s). A ≤5-fold increase of dyn2 relative to endogenous levels activates the transcription factor p53 and induces apoptosis, as demonstrated by reduced cell proliferation, DNA fragmentation, and caspase-3 activation. Dyn2-triggered apoptosis occurs only in dividing cells and is p53 dependent. A mutant defective in GTP binding does not trigger apoptosis, indicating that increased levels of dyn2·GTP, rather than protein levels per se, are required to transduce signals that activate p53. A truncated dyn2 lacking the COOH-terminal proline/arginine-rich domain (PRD), which interacts with many SH3 domain-containing partners implicated in both endocytosis and signal transduction, triggers apoptosis even more potently than the wild-type. This observation provides additional support for the importance of the NH2-terminal GTPase domain for the apoptotic phenotype. All described effects are dyn2-specific because >200-fold overexpression of dyn1, the 70% identical neuronal isoform, has no effect. Our data suggest that dyn2 can act as a signal transducing GTPase affecting transcriptional regulation.
突变动力蛋白的诱导特异性阻断内吞涂层囊泡的形成。
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影响因子: 7.8
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