New Insights into Labile Phosphorylation in Mammalian Cells

Strategic Insights -

Researchers at the University of Liverpool have highlighted the importance of labile phosphorylation in mammalian signalling networks, shedding light on a previously understudied area of biochemistry. The study, published in Biochemical Society Transactions, reveals that labile phosphorylation sites (LaPhs) play diverse roles in mammalian cells, distinct from the highly stable phosphomonoesters of pSer, pThr, and pTyr. This research has significant implications for our understanding of cellular signalling and the potential for new therapeutic targets.

Key Takeaways:

  • Labile phosphorylation sites (LaPhs) are made up of six phosphorylatable amino acids: His, Lys, Arg, Asp, Glu, and Cys, which form a distinct group from the highly stable phosphomonoesters of pSer, pThr, and pTyr.
  • LaPhs have distinct thermal and pH stability profiles, which may contribute to, or even dictate, their functions, and are mostly ignored in the signalling research field due to historical and technological factors.
  • The research concluded that LaPhs contribute to diverse functions in mammalian signalling networks, which is highlighted in the study "Are you having a LaPh? Diverse roles of Labile Phosphorylation in mammalian cells".
  • The study demonstrated that LaPhs are characterised by an acid and/or heat-labile phosphate linkage, making them distinct from the highly stable phosphomonoesters.
  • Claire E. Eyers, Centre for Proteome Research, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, was quoted in the study, indicating the significance of LaPhs in mammalian signalling networks.

Statistics:

  • 6 phosphorylatable amino acids make up the labile phosphorylation sites (LaPhs): His, Lys, Arg, Asp, Glu, and Cys.
  • 3 highly stable phosphomonoesters, pSer, pThr, and pTyr, dominate the signalling research field in mammals.
  • LaPhs have distinct thermal and pH stability profiles, which may contribute to, or even dictate, their functions.

Sources:

  • NewsRx. Researchers at University of Liverpool Discuss Findings in Biochemistry (Are you having a LaPh? Diverse roles of Labile Phosphorylation in mammalian cells). Life Science Weekly. November 4, 2025; p 5730.
  • Biochemical Society Transactions. "Are you having a LaPh? Diverse roles of Labile Phosphorylation in mammalian cells." Published 2025.