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-Structure paper
タイトル | Cryo-EM structures of PP2A:B55-FAM122A and PP2A:B55-ARPP19. |
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ジャーナル・号・ページ | Nature, Vol. 625, Issue 7993, Page 195-203, Year 2024 |
掲載日 | 2023年12月20日 |
著者 | Sathish K R Padi / Margaret R Vos / Rachel J Godek / James R Fuller / Thomas Kruse / Jamin B Hein / Jakob Nilsson / Matthew S Kelker / Rebecca Page / Wolfgang Peti / |
PubMed 要旨 | Progression through the cell cycle is controlled by regulated and abrupt changes in phosphorylation. Mitotic entry is initiated by increased phosphorylation of mitotic proteins, a process driven by ...Progression through the cell cycle is controlled by regulated and abrupt changes in phosphorylation. Mitotic entry is initiated by increased phosphorylation of mitotic proteins, a process driven by kinases, whereas mitotic exit is achieved by counteracting dephosphorylation, a process driven by phosphatases, especially PP2A:B55. Although the role of kinases in mitotic entry is well established, recent data have shown that mitosis is only successfully initiated when the counterbalancing phosphatases are also inhibited. Inhibition of PP2A:B55 is achieved by the intrinsically disordered proteins ARPP19 and FAM122A. Despite their critical roles in mitosis, the mechanisms by which they achieve PP2A:B55 inhibition is unknown. Here, we report the single-particle cryo-electron microscopy structures of PP2A:B55 bound to phosphorylated ARPP19 and FAM122A. Consistent with our complementary NMR spectroscopy studies, both intrinsically disordered proteins bind PP2A:B55, but do so in highly distinct manners, leveraging multiple distinct binding sites on B55. Our extensive structural, biophysical and biochemical data explain how substrates and inhibitors are recruited to PP2A:B55 and provide a molecular roadmap for the development of therapeutic interventions for PP2A:B55-related diseases. |
リンク | Nature / PubMed:38123684 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.55 - 2.79961 Å |
構造データ | EMDB-40644, PDB-8so0: EMDB-41604, PDB-8ttb: EMDB-41667, PDB-8twe: EMDB-41668, PDB-8twi: |
化合物 | ChemComp-FE: ChemComp-ZN: |
由来 |
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キーワード | SIGNALING PROTEIN / Protein Phosphatase 2A:B55 holoenzyme FAM122A inhibitor substrate binding cell cycle regulation / HYDROLASE / Protein Phosphatase 2A:B55 holoenzyme / ARPP19 inhibitor / cell cycle regulation |