Download MendeleyPeptide Fragments of Odin-Sam1: Conformational Analysis and Interaction Studies with EphA2-Sam.
Mercurio, F.A., Di Natale, C., Pirone, L., Scognamiglio, P.L., Marasco, D., Pedone, E.M., Saviano, M., Leone, M.(2015) Chembiochem 16: 1629-1636
- PubMed: 26120079
- DOI: https://doi.org/10.1002/cbic.201500197
- Primary Citation of Related Structures:
2MYQ - PubMed Abstract:
Odin is a protein belonging to the ANKS family, and has two tandem Sam domains. The first, Odin-Sam1, binds to the Sam domain of the EphA2 receptor (EphA2-Sam); this interaction could be crucial for the regulation of receptor endocytosis and might have an impact on cancer. Odin-Sam1 associates with EphA2-Sam by adopting a "mid-loop/end-helix" model. In this study three peptide sequences, encompassing the mid-loop interacting portion of Odin-Sam1 and its C-terminal α5 helix, were designed. Their conformational properties were analyzed by CD and NMR. In addition, their abilities to interact with EphA2-Sam were investigated by SPR studies. The peptides adopt a predominantly disordered state in aqueous buffer, but a higher helical content is evident in the presence of the cosolvent trifluoroethanol. Dissociation constants towards EphA2-Sam were in the high micromolar range. The structural findings suggest further routes for the design of potential anti-cancer therapeutics as inhibitors of EphA2-Sam heterotypic interactions.
Organizational Affiliation:
Institute of Biostructures and Bioimaging, National Research Council, Via Mezzocannone 16, 80134, Naples (Italy).
