National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM144379
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM144483
United States
Citation
Journal: Nature / Year: 2024 Title: Cryo-EM structures of PP2A:B55-FAM122A and PP2A:B55-ARPP19. Authors: 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 / Abstract: 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.
GHMRSSNDYT SQMYSAKPYA HILSVPVSET AYPGQTQYQT LQQTQPYAVY EE
UniProtKB: Protein phosphatase EYA3
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Macromolecule #5: FE (II) ION
Macromolecule
Name: FE (II) ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: FE2
Molecular weight
Theoretical: 55.845 Da
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Macromolecule #6: ZINC ION
Macromolecule
Name: ZINC ION / type: ligand / ID: 6 / Number of copies: 1 / Formula: ZN
Molecular weight
Theoretical: 65.409 Da
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
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Sample preparation
Buffer
pH: 8
Vitrification
Cryogen name: ETHANE
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Electron microscopy
Microscope
FEI TITAN KRIOS
Specialist optics
Energy filter - Slit width: 10 eV
Image recording
Film or detector model: FEI FALCON IV (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 1 / Number real images: 4607 / Average exposure time: 7.0 sec. / Average electron dose: 51.04 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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