MURC/Cavin-4 and cavin family members form tissue-specific caveolar complexes.

MURC/Cavin-4 and cavin family members form tissue-specific caveolar complexes.
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DOI:
10.1083/jcb.200903053
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发表时间:
2009-06-29
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Parton RG
Parton RG
中科院分区:
其他
文献类型:
--
作者:
Bastiani M;Liu L;Hill MM;Jedrychowski MP;Nixon SJ;Lo HP;Abankwa D;Luetterforst R;Fernandez-Rojo M;Breen MR;Gygi SP;Vinten J;Walser PJ;North KN;Hancock JF;Pilch PF;Parton RG

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聚合酶I和转录释放因子(PTRF)/Cavin是一种细胞质蛋白,其表达对于小窝形成是强制性的。使用生物化学和荧光共振能量转移为基础的方法,我们现在表明,一个家庭的相关蛋白质,PTRF/Cavin-1,血清剥夺反应(SDR)/Cavin-2,SDR相关的基因产物,结合到C激酶(SRBC)/Cavin-3,和肌肉限制性卷曲螺旋蛋白(MURC)/Cavin-4,形成一个多蛋白复合物,与小窝。这种复合物可以组成性地组装在细胞质中,并与质膜小窝处的小窝蛋白结合。Cavin-1,而不是其他cavins,可以诱导在异源系统中的小窝形成,并需要募集的cavin复合物小窝。cavins的组织限制性表达表明,caveolae可以执行由cavin复合物的组成调节的组织特异性功能。Cavin-4主要在肌肉中表达,并且其分布在与Caveolin-3功能障碍相关的人类肌肉疾病中受到干扰,将Cavin-4鉴定为新的肌肉疾病候选Caveolar蛋白。
Polymerase I and transcript release factor (PTRF)/Cavin is a cytoplasmic protein whose expression is obligatory for caveola formation. Using biochemistry and fluorescence resonance energy transfer–based approaches, we now show that a family of related proteins, PTRF/Cavin-1, serum deprivation response (SDR)/Cavin-2, SDR-related gene product that binds to C kinase (SRBC)/Cavin-3, and muscle-restricted coiled-coil protein (MURC)/Cavin-4, forms a multiprotein complex that associates with caveolae. This complex can constitutively assemble in the cytosol and associate with caveolin at plasma membrane caveolae. Cavin-1, but not other cavins, can induce caveola formation in a heterologous system and is required for the recruitment of the cavin complex to caveolae. The tissue-restricted expression of cavins suggests that caveolae may perform tissue-specific functions regulated by the composition of the cavin complex. Cavin-4 is expressed predominantly in muscle, and its distribution is perturbed in human muscle disease associated with Caveolin-3 dysfunction, identifying Cavin-4 as a novel muscle disease candidate caveolar protein.
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