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- W4386502093 abstract "The ligand-regulated PAS domains are one of the most diverse signal-integrating domains found in proteins from prokaryotes to humans. By biochemically connecting cellular processes with their environment, PAS domains facilitate an appropriate cellular response. PAS domain-containing Kinase (PASK) is an evolutionarily conserved protein kinase that plays important signaling roles in mammalian stem cells to establish stem cell fate. We have recently shown that the nuclear translocation of PASK is stimulated by differentiation signaling cues in muscle stem cells. However, the mechanistic basis of the regulation of PASK nucleo-cytoplasmic translocation remains unknown. Here, we show that the PAS-A domain of PASK contains a putative monopartite nuclear localization sequence (NLS) motif. This NLS is inhibited in cells via intramolecular association with a short linear motif, termed the PAS Interacting Motif (PIM), found upstream of the kinase domain. The interaction between the PAS-A domain and PIM is evolutionarily conserved and serves to retain PASK in the cytosol in the absence of signaling cues. Consistent with that, we show that metabolic inputs induce PASK nuclear import, likely by disrupting the PAS-A: PIM association. We suggest that a route for such linkage may occur through the PAS-A ligand binding cavity in that we have previously described and show here that PIM recruitment and artificial ligand binding to the PAS-A domain occur at neighboring locations that could facilitate metabolic control of the PAS-PIM interaction. Thus, the PAS-A domain of PASK integrates metabolic signaling cues for nuclear translocation and could be targeted to control the balance between self-renewal and differentiation in stem cells." @default.
- W4386502093 created "2023-09-08" @default.
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- W4386502093 date "2023-09-06" @default.
- W4386502093 modified "2023-09-29" @default.
- W4386502093 title "Signal-regulated unmasking of the nuclear localization motif in the PAS domain regulates the nuclear translocation of PASK." @default.
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- W4386502093 doi "https://doi.org/10.1101/2023.09.06.556462" @default.
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