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Interaction of c-Src with gap junction protein connexin-43. Role in the regulation of cell-cell communication

机译:c-Src与间隙连接蛋白连接蛋白43的相互作用。在细胞间通信调节中的作用

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摘要

Cell-cell communication via connexin-43 (Cx43)-based gap junctions is transiently inhibited by certain mitogens, but the underlying regulatory mechanisms are incompletely understood. Our previous studies have implicated the c-Src tyrosine kinase in mediating transient closure of Cx43-based gap junctions in normal fibroblasts. Here we show that activated c-Src (c-SrcK(+)) phosphorylates the COOH-terminal tail of Cx43, both in vitro and in intact cells. Coimmunoprecipitation experiments reveal that Cx43 associates with c-SrcK(+) and, to a lesser extent, with wild-type c-Src, but not with kinase-dead c-Src. Mutation of residue Cx43 Tyr(265) (Cx43-Y265F mutant) abolishes both tyrosine phosphorylation of Cx43 and its coprecipitation with c-Src. Expression of c-SrcK(+) in Rat-1 cells disrupts gap junctional communication. Strikingly, the communication-defective phenotype is bypassed after coexpression of the Cx43-Y265F mutant or a COOH-terminally truncated version of Cx43 (Cx43Delta263) that lacks residue Tyr(265). Our results support a model in which activated c-Src phosphorylates the COOH-terminal tail of Cx43 on residue Tyr(265), resulting in a stable interaction between both proteins leading to inhibition of gap junctional communication.
机译:通过基于连接蛋白43(Cx43)的缝隙连接的细胞间通讯被某些促细胞分裂剂瞬时抑制,但潜在的调节机制尚不完全清楚。我们以前的研究已暗示c-Src酪氨酸激酶介导正常成纤维细胞中基于Cx43的间隙连接的瞬时关闭。在这里,我们显示激活的c-Src(c-SrcK(+))磷酸化Cx43的COOH末端尾巴,无论是在体外还是在完整细胞中。免疫共沉淀实验表明Cx43与c-SrcK(+)关联,并在较小程度上与野生型c-Src关联,但与激酶死亡的c-Src关联。残基Cx43 Tyr(265)(Cx43-Y265F突变体)的突变消除了Cx43的酪氨酸磷酸化以及与c-Src的共沉淀。 Rat-1细胞中c-SrcK(+)的表达破坏间隙连接通讯。令人惊讶的是,在共表达Cx43-Y265F突变体或缺少残基Tyr(265)的Cx43的COOH末端截短版本(Cx43Delta263)后,绕过了通讯缺陷型表型。我们的结果支持一个模型,其中激活的c-Src磷酸化残基Tyr(265)上Cx43的COOH末端尾巴,导致两种蛋白之间的稳定相互作用导致间隙连接通讯的抑制。

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