Ac-Tyr(PO3H2)-Glu-Glu-Ile-Glu-OH is a phosphorylated pentapeptide often used to investigate phosphotyrosine recognition in signaling pathways. Its charged phosphate group enhances studies of enzyme-substrate specificity and SH2-domain interactions. Researchers apply it to model phosphorylation-dependent regulatory motifs. The peptide supports structural analyses of post-translational control.
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