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Molecular simulations of enzymatic phosphorylation of disordered proteins and their condensates

Author

Listed:
  • Emanuele Zippo

    (Johannes Gutenberg University Mainz
    Johannes Gutenberg University Mainz)

  • Dorothee Dormann

    (Johannes Gutenberg University Mainz
    Institute of Molecular Biology (IMB))

  • Thomas Speck

    (University of Stuttgart)

  • Lukas S. Stelzl

    (Johannes Gutenberg University Mainz
    Institute of Molecular Biology (IMB)
    Johannes Gutenberg University Mainz)

Abstract

Condensation and aggregation of disordered proteins in cellular non-equilibrium environments are shaped decisively by enzymes. Enzymes called kinases phosphorylate proteins, consuming the chemical fuel ATP. Protein phosphorylation by kinases such as Casein kinase 1 delta (CK1δ) determines the interactions of neurodegeneration-linked proteins such as TDP-43. Hyperphosphorylation of TDP-43 by CK1δ may be a cytoprotective mechanism for neurons, but how CK1δ interacts with protein condensates is not known. Molecular dynamics simulations hold the promise to resolve how kinases interact with disordered proteins and their condensates, and how this shapes the phosphorylation dynamics. In practice, it is difficult to verify whether implementations of chemical-fuel driven coarse-grained simulations are thermodynamically consistent, which we address by a generally applicable and automatic Markov state modeling approach. In this work, we thus elucidate with coarse-grained simulations, drivers of how TDP-43 is phosphorylated by CK1δ and how this leads to the dissolution of TDP-43 condensates upon hyperphosphorylation.

Suggested Citation

  • Emanuele Zippo & Dorothee Dormann & Thomas Speck & Lukas S. Stelzl, 2025. "Molecular simulations of enzymatic phosphorylation of disordered proteins and their condensates," Nature Communications, Nature, vol. 16(1), pages 1-16, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59676-4
    DOI: 10.1038/s41467-025-59676-4
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