5AAN
Crystal structure of Drosophila NCS-1 bound to penothiazine FD44
Summary for 5AAN
| Entry DOI | 10.2210/pdb5aan/pdb |
| Descriptor | CG5907-PA, ISOFORM A, CALCIUM ION, N-phenothiazin-10-yl-2-piperidin-1-yl-ethanamide, ... (5 entities in total) |
| Functional Keywords | calcium sensor, calcium-binding protein |
| Biological source | DROSOPHILA MELANOGASTER (FRUIT FLY) |
| Total number of polymer chains | 1 |
| Total formula weight | 22502.28 |
| Authors | Chaves-Sanjuan, A.,Infantes, L.,Sanchez-Barrena, M.J. (deposition date: 2015-07-27, release date: 2017-01-25, Last modification date: 2024-01-10) |
| Primary citation | Mansilla, A.,Chaves-Sanjuan, A.,Campillo, N.E.,Semelidou, O.,Martinez-Gonzalez, L.,Infantes, L.,Gonzalez-Rubio, J.M.,Gil, C.,Conde, S.,Skoulakis, E.M.,Ferrus, A.,Martinez, A.,Sanchez-Barrena, M.J. Interference of the complex between NCS-1 and Ric8a with phenothiazines regulates synaptic function and is an approach for fragile X syndrome. Proc. Natl. Acad. Sci. U.S.A., 114:E999-E1008, 2017 Cited by PubMed Abstract: The protein complex formed by the Ca sensor neuronal calcium sensor 1 (NCS-1) and the guanine exchange factor protein Ric8a coregulates synapse number and probability of neurotransmitter release, emerging as a potential therapeutic target for diseases affecting synapses, such as fragile X syndrome (FXS), the most common heritable autism disorder. Using crystallographic data and the virtual screening of a chemical library, we identified a set of heterocyclic small molecules as potential inhibitors of the NCS-1/Ric8a interaction. The aminophenothiazine FD44 interferes with NCS-1/Ric8a binding, and it restores normal synapse number and associative learning in a Drosophila FXS model. The synaptic effects elicited by FD44 feeding are consistent with the genetic manipulation of NCS-1. The crystal structure of NCS-1 bound to FD44 and the structure-function studies performed with structurally close analogs explain the FD44 specificity and the mechanism of inhibition, in which the small molecule stabilizes a mobile C-terminal helix inside a hydrophobic crevice of NCS-1 to impede Ric8a interaction. Our study shows the drugability of the NCS-1/Ric8a interface and uncovers a suitable region in NCS-1 for development of additional drugs of potential use on FXS and related synaptic disorders. PubMed: 28119500DOI: 10.1073/pnas.1611089114 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.6 Å) |
Structure validation
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