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Structural basis for APPTPPPLPP peptide recognition by the FBP11WW1 domain
José Ricardo Pires1, Christoph Parthier, Rodolpho do Aido-Machado
1Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowiski s/n CCS, Rio de Janeiro, RJ 21941-590, Brazil. jrmpires@gmx.net
Journal of Molecular Biology
|April 7, 2005
Summary
Class II WW domains, like that in formin binding protein 11 (FBP11), specifically bind proline-rich motifs. This study reveals the novel structure of an FBP11WW1-formin complex, uncovering key determinants for this protein interaction.
Area of Science:
- * Molecular and Structural Biology
- * Protein-protein Interactions
- * Developmental Biology
Background:
- * WW domains are crucial protein modules mediating interactions with proline-rich sequences.
- * Class II WW domains, exemplified by formin binding protein 11 (FBP11), recognize specific PPLPp motifs.
- * These interactions are vital in developmental processes (limb/kidney) and neurological disorders (Rett syndrome via MeCP2).
Purpose of the Study:
- * To elucidate the structural basis for the specific recognition of PPLPp motifs by class II WW domains.
- * To determine the structural determinants governing the interaction between FBP11WW1 and its formin-binding partners.
- * To provide insights into the molecular mechanisms underlying FBP11-mediated protein interactions.
Main Methods:
- * Protein expression and purification of the FBP11WW1 domain and a relevant formin fragment.
- * Determination of the complex structure using X-ray crystallography.
- * Structural analysis to identify key residues and interactions mediating specificity.
Main Results:
- * Novel crystal structure of the FBP11WW1 domain in complex with an APPTPPPLPP formin fragment.
- * Identification of a specific leucine side-chain interaction critical for binding affinity and specificity.
- * Detailed structural insights into the binding interface, highlighting the role of specific residues in motif recognition.
Conclusions:
- * The structure reveals the precise molecular interactions defining class II WW domain specificity.
- * Understanding these determinants is crucial for comprehending FBP11 function in development and disease.
- * This work lays the foundation for further studies on WW domain-mediated interactions and their implications.