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Transmembrane 4 L Six Family Member 5 Senses Arginine for mTORC1 Signaling

机译:跨膜4L六个家庭成员5感测MTORC1信令的精氨酸

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摘要

The mechanistic target of rapamycin complex (mTORC1) is a signaling hub on the lysosome surface, responding to lysosomal amino acids. Although arginine is metabolically important, the physiological arginine sensor that activates mTOR remains unclear. Here, we show that transmembrane 4 L six family member 5 (TM4SF5) translocates from plasma membrane to lysosome upon arginine sufficiency and senses arginine, culminating in mTORC1/S6K1 activation. TM4SF5 bound active mTOR upon arginine sufficiency and constitutively bound amino acid transporter SLC38A9. TM4SF5 binding to the cytosolic arginine sensor Castor1 decreased upon arginine sufficiency, thus allowing TM4SF5-mediated sensing of metabolic amino acids. TM4SF5 directly bound free L-arginine via its extracellular loop possibly for the efflux, being supported by mutant study and homology and molecular docking modeling. Therefore, we propose that lysosomal TM4SF5 senses and enables arginine efflux for mTORC1/S6K1 activation, and arginine-auxotroph in hepatocellular carcinoma may be targeted by blocking the arginine sensing using anti-TM4SF5 reagents.
机译:雷帕霉素复合物(MTORC1)的机械靶标是溶酶体表面上的信号毂,响应溶酶体氨基酸。尽管精氨酸是代谢的重要性,但激活MTOR的生理精氨酸传感器仍不清楚。在这里,我们表明,在精氨酸充足性并感应精氨酸,在MTORC1 / S6K1激活中,从质膜4 L六个家庭成员5(TM4SF5)从血浆膜转移到溶酶体中。 TM4SF5结合的活性MTOR在精氨酸充足性上,组成型结合的氨基酸转运蛋白SLC38A9。 TM4SF5与细胞溶质精氨酸传感器Castor1的结合在精氨酸充足性时降低,从而允许TM4SF5介导的代谢氨基酸的感测。 TM4SF5通过其细胞外环直接无限制的L-精氨酸,可能是突变学研究和同源性和分子对接模拟的支持。因此,我们提出溶酶体TM4SF5感测和使得MTORC1 / S6K1活化的精氨酸流出,并且通过使用抗TM4SF5试剂阻断精氨酸感测,可以靶向精氨酸 - 毒细胞植物。

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