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Pan methyl lysine refers to lysine residues in proteins that undergo post translational methylation on the epsilon-amino group, occurring as mono, di, or trimethylation, a reversible process catalyzed by lysine methyltransferases (KMTs) and removed by lysine demethylases (KDMs). Lysine methylation plays a key role in regulating chromatin structure and gene expression by altering histone DNA interactions, with functional outcomes that depend on the specific residue and methylation state, such as H3K4me3 being associated with active transcription and H3K27me3 with gene repression. Beyond histones, methylation of lysine residues influences diverse biological processes including gene regulation, signal transduction, and protein, protein interactions, as methylated lysines serve as recognition sites for proteins containing methyl lysine binding domains such as chromodomains and Tudor domains. Clinically, aberrant lysine methylation patterns are linked to diseases including cancer and neurological disorders, making methylation status a useful biomarker for diagnosis and prognosis and positioning methylation and demethylation enzymes as important targets for therapeutic drug development.
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