Hexokinase-II positively regulates glucose starvation-induced autophagy through TORC1 inhibition.

Hexokinase-II positively regulates glucose starvation-induced autophagy through TORC1 inhibition.
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DOI:
10.1016/j.molcel.2013.12.019
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发表时间:
2014-02-20
期刊:
影响因子:
16
通讯作者:
Miyamoto, Shigeki
Miyamoto, Shigeki
中科院分区:
生物学1区
文献类型:
--
作者:
Roberts, David J.;Tan-Sah, Valerie P.;Ding, Eric Y.;Smith, Jeffery M.;Miyamoto, Shigeki

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己糖激酶-II(HK-II)催化糖酵解的第一步,也作为一种保护性分子发挥作用,然而,其在保护性自噬中的作用尚未确定。结果表明,在心肌细胞和非心肌细胞中,HK-II的抑制减弱,而HK-II的过表达增强了葡萄糖剥夺诱导的自噬。免疫沉淀研究表明,HK-II结合并抑制自噬抑制因子mTOR复合物1(TORC 1),这种结合通过葡萄糖剥夺而增加。TOS基序是一种负责结合TORC 1底物的支架序列,存在于HK-II中,使其突变可阻断其结合TORC 1和调节保护性自噬的能力。从糖酵解到自噬的转变似乎受到葡萄糖-6磷酸减少的调节。我们认为,HK-II结合TORC 1作为诱饵底物,并提供了一个以前未被认识到的机制,用于将细胞从基于丰富能量的代谢经济转换为饥饿条件下的保守经济。
Hexokinase-II (HK-II) catalyzes the first step of glycolysis and also functions as a protective molecule, however, its role in protective autophagy has not been determined. Results showed that inhibition of HK-II diminished, while overexpression of HK-II potentiated, autophagy induced by glucose deprivation in cardiomyocyte and non-cardiomyocyte cells. Immunoprecipitation studies revealed that HK-II binds to and inhibits the autophagy suppressor, mTOR complex 1 (TORC1), and this binding was increased by glucose deprivation. The TOS motif, a scaffold sequence responsible for binding TORC1 substrates, is present in HK-II and mutating it blocked its ability to bind to TORC1 and regulate protective autophagy. The transition from glycolysis to autophagy appears to be regulated by a decrease in glucose-6 phosphate. We suggest that HK-II binds TORC1 as a decoy substrate and provides a previously unrecognized mechanism for switching cells from a metabolic economy based on plentiful energy, to one of conservation, under starvation.
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