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3D structures of alpha-helix binding domains. (a) Superposition of the alpha-helix binding regions of chicken calmodulin (red, code entry 2O5G), HsCen2 (blue, code entry 2GGM), scherffelia dubbia centrin (green, code entry 3KF9) and rabbit troponin C (yellow, code entry 1A2X). (b) Structure of human BCL-XL binding domain (code entry 1BXL). (c) Structure of human E3 ubiquitin-protein ligase MDM2 (code entry 1YCR) binding domain.
