ArticlebioRxiv : the preprint server for biology2025
Small molecule activator of phosphatase PP2A remodels scaffold PR65 structural dynamics to promote holoenzyme assembly.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Small molecule activators of protein phosphatase 2A (PP2A), hereafter SMAPs, have attracted substantial interest, for their potential to inhibit cancer cell proliferation by targeting PR65, the scaffold subunit of the PP2A heterotrimer. PR65 is a uniquely flexible and stable molecule composed of 15 tandem HEAT (Huntingtin, Elongation factor 3-PP2A-TOR1) repeats. We characterized the binding sites and interactions of two SMAPs ATUX-8385 and DT-061 with PR65 and evaluated effects on PR65 structural dynamics using docking and molecular dynamics simulations. We initiated SMAP-bound PR65 simulations starting from two binding sites: S1, determined by cryo-electron microscopy for DT-061 bound to PP2A, on the inner helices of the HEAT repeats 2 and 3 (2
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