Peptide Modifications intermediate
Peptide Phosphorylation Sites
Guide to phosphorylation of serine, threonine, and tyrosine residues in peptide signaling.
By Encyclopeptide Editorial | 1 min read
phosphorylation kinase signaling modification
Overview
Phosphorylation is the most common post-translational modification, regulating protein activity through kinase-mediated phosphate addition.
Residue Specificity
- Serine: Most frequent (~85% of phosphorylation)
- Threonine: Second most common (~10%)
- Tyrosine: Less frequent but critical in signaling (~5%)
Biological Significance
Phosphorylation acts as a molecular switch controlling cell cycle, signal transduction, metabolism, and gene expression. Dysregulation drives cancer and metabolic diseases.
References
- Source: ENCP Peptide Database
- Category: Peptide Modifications
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