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Functional cloning of TUG as a regulator of GLUT4 glucose transporter trafficking

机译:TUG的功能性克隆作为GLUT4葡萄糖转运蛋白运输的调节剂

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摘要

Insulin stimulates glucose uptake in fat and muscle by mobilizing the GLUT4 glucose transporter. GLUT4 is sequestered intracellu-larly in the absence of insulin, and is redistributed to the plasma membrane within minutes of insulin stimulation. But the trafficking mechanisms that control GLUT4 sequestration have remained elusive. Here we describe a functional screen to identify proteins that modulate GLUT4 distribution, and identify TUG as a putative tether, containing a UBX domain, for GLUT4. In truncated form, TUG acts in a dominant-negative manner to inhibit insulin-stimulated GLUT4 redistribution in Chinese hamster ovary cells and 3T3-L1 adipocytes. Full-length TUG forms a complex specifically with GLUT4; in 3T3-L1 adipocytes, this complex is present in unstimulated cells and is largely disassembled by insulin. Endogenous TUG is localized with the insulin-mobilizable pool of GLUT4 in unstimulated 3T3-L1 adipocytes, and is not mobilized to the plasma membrane by insulin. Distinct regions of TUG are required to bind GLUT4 and to retain GLUT4 intracellularly in transfected, non-adipose cells. Our data suggest that TUG traps endocytosed GLUT4 and tethers it intracellularly, and that insulin mobilizes this pool of retained GLUT4 by releasing this tether.
机译:胰岛素通过调动GLUT4葡萄糖转运蛋白刺激脂肪和肌肉中的葡萄糖摄取。 GLUT4在不存在胰岛素的情况下被细胞内隔离,并在胰岛素刺激后的几分钟内重新分布到质膜。但是,控制GLUT4螯合的贩运机制仍然难以捉摸。在这里,我们描述了一个功能屏幕,用于识别可调节GLUT4分布的蛋白质,并将TUG识别为GLUT4的推定系链,其中包含UBX域。 TUG以截短形式以显性负性方式抑制胰岛素刺激的GLUT4在中国仓鼠卵巢细胞和3T3-L1脂肪细胞中的重新分布。全长TUG与GLUT4形成复合体。在3T3-L1脂肪细胞中,这种复合物存在于未刺激的细胞中,并在很大程度上被胰岛素分解。内源性TUG定位在未刺激的3T3-L1脂肪细胞中的胰岛素可动的GLUT4库中,并且不被胰岛素动员至质膜。 TUG的不同区域需要结合GLUT4并在转染的非脂肪细胞中在细胞内保留GLUT4。我们的数据表明,TUG会捕获内吞的GLUT4并将其拴在细胞内,并且胰岛素会通过释放该拴系来动员保留的GLUT4库。

著录项

  • 来源
    《Nature》 |2003年第6959期|p.727-733|共7页
  • 作者单位

    Section of Endocrinology and Metabolism, Department of Internal Medicine, Yale University School of Medicine, 333 Cedar Street, Box 208020, New Haven, Connecticut 06520-8020, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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