Three-layer model maps how protein-modifying enzymes may help regulate immunity
Researchers at the University of Tsukuba have proposed a "three-tiered proteostasis model" for describing immune regulation by protein arginine methyltransferases (PRMTs), comprising protein arginine methylation, free methylarginine generation from protein turnover and methyltransferase-independent interactions with RNA and proteins. The framework integrates emerging evidence linking PRMTs to…
Researchers from the University of Tsukuba have proposed a three-tiered model to explain how protein arginine methyltransferases (PRMTs) influence immune regulation. This model integrates evidence linking PRMTs to various aspects of immunity, metabolism, vascular function, and age-related inflammation.
The framework consists of three layers. Layer 1 involves the methylation of histone and nonhistone proteins. Layer 2 covers the production of free methylarginines through the degradation of methylated proteins. Layer 3 encompasses methyltransferase-independent interactions between PRMTs and RNA or proteins.
The study synthesizes recent findings demonstrating how PRMT family enzymes regulate gene expression, RNA metabolism, immune signaling, tumor immunity, and chronic inflammation associated with aging. It also explores potential therapeutic strategies for immune-related diseases.
The researchers emphasize that PRMTs have regulatory roles beyond their methylation activity, which was not previously considered. By proposing this three-tiered model, the researchers aim to better understand the connection between intracellular protein regulation and broader physiological processes, such as immune responses, metabolism, and vascular homeostasis.
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