8AMY
High-resolution crystal structure of the Mu8.1 conotoxin from Conus Mucronatus
Summary for 8AMY
| Entry DOI | 10.2210/pdb8amy/pdb |
| Descriptor | Mu8.1 conotoxin, 2-(N-MORPHOLINO)-ETHANESULFONIC ACID, 1-ETHOXY-2-(2-ETHOXYETHOXY)ETHANE, ... (8 entities in total) |
| Functional Keywords | conotoxin, toxin, antagonist, cav2.3 inhibitor, mu8.1 |
| Biological source | Conus mucronatus |
| Total number of polymer chains | 1 |
| Total formula weight | 10902.58 |
| Authors | Mueller, E.,Hackney, C.M.,Ellgaard, L.,Morth, J.P. (deposition date: 2022-08-04, release date: 2023-08-23, Last modification date: 2024-10-16) |
| Primary citation | Muller, E.,Hackney, C.M.,Ellgaard, L.,Morth, J.P. High-resolution crystal structure of the Mu8.1 conotoxin from Conus mucronatus. Acta Crystallogr.,Sect.F, 79:240-246, 2023 Cited by PubMed Abstract: Marine cone snails produce a wealth of peptide toxins (conotoxins) that bind their molecular targets with high selectivity and potency. Therefore, conotoxins constitute valuable biomolecular tools with a variety of biomedical purposes. The Mu8.1 conotoxin from Conus mucronatus is the founding member of the newly identified saposin-like conotoxin class of conotoxins and has been shown to target Cav2.3, a voltage-gated calcium channel. Two crystal structures have recently been determined of Mu8.1 at 2.3 and 2.1 Å resolution. Here, a high-resolution crystal structure of Mu8.1 was determined at 1.67 Å resolution in the high-symmetry space group I422. The asymmetric unit contained one molecule, with a symmetry-related molecule generating a dimer equivalent to that observed in the two previously determined structures. The high resolution allows a detailed atomic analysis of a water-filled cavity buried at the dimer interface, revealing a tightly coordinated network of waters that shield a lysine residue (Lys55) with a predicted unusually low side-chain pK value. These findings are discussed in terms of a potential functional role of Lys55 in target interaction. PubMed: 37642664DOI: 10.1107/S2053230X23007070 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.67 Å) |
Structure validation
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