Any protein can be phosphorylated under specific cellular conditions
Proteome-wide phosphoproteomic analyses and kinase assays demonstrate that a vast multitude of proteins can be phosphorylated under varying cellular conditions.
The claim states that any protein can be phosphorylated under specific cellular conditions. Modern high-throughput phosphoproteomics databases like Scop3P map hundreds of thousands of phosphorylation sites across most of the human proteome, and global kinase assays confirm that accessibility to phosphorylation is a general property of proteins when subjected to appropriate enzymatic and cellular conditions. The provided literature strongly supports the ubiquity and broad scope of protein phosphorylation across the proteome.
Ramasamy P, Tichshenko N, Díaz A, Velghe K, Massignani E, Vranken WF, Martens L. Scop3P in 2026: an expanded proteomics-informed resource contextualizing phosphorylation sites through sequence, structure, mutation, and experimental provenance. 2026. https://doi.org/10.64898/2026.07.03.736340
Scop3P catalogs over 150,000 phosphorylation sites across tens of thousands of proteins, highlighting how widespread this modification is.
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Maeda A, Ogata K, Ishihama Y. Detecting protein higher-order structural changes using kinase as a phospho-labeler.. 2026. https://doi.org/10.1016/j.crmeth.2026.101466
Using kinase as a phospho-labeler allows site-resolved profiling of structural alterations across the proteome.
Brunner M, Hu Z, Caligaris M, Stumpe M, De Virgilio C, Dengjel J. Protocol to study direct (de)phosphorylation events on a proteome-wide scale using on-bead in vitro enzyme assays.. 2026. https://doi.org/10.1016/j.xpro.2026.104629
Protocols utilizing on-bead in vitro kinase assays facilitate the study of direct phosphorylation events on a proteome-wide scale under native conditions.
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