Protein-peptide binding pathways revealed by two-dimensional replica-exchange molecular dynamics

Two-dimensional replica-exchange simulations of Abl kinase with Abltide reveal five encounter regions and six intermediate states linking initial contact to the bound pose.

• Why it matters: Understanding how flexible substrate peptides approach and settle into kinase recognition sites is needed to improve specificity and peptide-based inhibitor design, beyond static bound-pose and affinity measurements.
• What they did: The study used gREST/REUS to enhance peptide and binding-interface flexibility while sampling progression along a distance coordinate, generating a binding landscape for Abl kinase–Abltide.
• The result: The simulations identify dominant binding pathways in which the EF/G/{beta}11 hydrophobic patch and the G helix negative patch centrally guide Abltide toward the substrate-binding site, informing rational inhibitor design.

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