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GAPDH inhibits intracellular pathways during starvation for cellular energy homeostasis.

ABSTRACT: Starvation poses a fundamental challenge to cell survival. Whereas the role of autophagy in promoting energy homeostasis in this setting has been extensively characterized1, other mechanisms are less well understood. Here we reveal that glyceraldehyde 3-phosphate dehydrogenase (GAPDH) inhibits coat protein I (COPI) transport by targeting a GTPase-activating protein (GAP) towards ADP-ribosylation factor 1 (ARF1) to suppress COPI vesicle fission. GAPDH inhibits multiple other transport pathways, also by targeting ARF GAPs. Further characterization suggests that this broad inhibition is activated by the cell during starvation to reduce energy consumption. These findings reveal a remarkable level of coordination among the intracellular transport pathways that underlies a critical mechanism of cellular energy homeostasis.

SUBMITTER: Yang JS

PROVIDER: S-EPMC6152935 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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GAPDH inhibits intracellular pathways during starvation for cellular energy homeostasis.

Yang Jia-Shu JS Hsu Jia-Wei JW Park Seung-Yeol SY Li Jian J Oldham William M WM Beznoussenko Galina V GV Mironov Alexander A AA Loscalzo Joseph J Hsu Victor W VW

Nature 20180912 7722

Starvation poses a fundamental challenge to cell survival. Whereas the role of autophagy in promoting energy homeostasis in this setting has been extensively characterized<sup>1</sup>, other mechanisms are less well understood. Here we reveal that glyceraldehyde 3-phosphate dehydrogenase (GAPDH) inhibits coat protein I (COPI) transport by targeting a GTPase-activating protein (GAP) towards ADP-ribosylation factor 1 (ARF1) to suppress COPI vesicle fission. GAPDH inhibits multiple other transport ...[more]

PMID: 30209366

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