Atomic Resolution (0.98 A) Structure of Eosinophil-Derived NeurotoxinSwaminathan, G.J., Holloway, D.E., Veluraja, K., Acharya, K.R.
(2002) Biochemistry 41: 3341
- PubMed: 11876642
- PubMed Abstract:
- Mapping the Ribonucleolytic Active Site of Eosinophil-Derived Neurotoxin (Edn): High Resolution Crystal Structures of Edn Complexes with Adenylic Nucleotide Inhibitors
Leonidas, D.D.,Boix, E.,Prill, R.,Suzuki, M.,Turton, R.,Minson, K.,Swaminathan, G.J.,Youle, R.J.,Acharya, K.R.
(2001) J.Biol.Chem. 276: 15009
Human eosinophil-derived neurotoxin (EDN) is a small, basic protein that belongs to the ribonuclease A superfamily. EDN displays antiviral activity and causes the neurotoxic Gordon phenomenon when injected into rabbits. Although EDN and ribonuclease ...
Human eosinophil-derived neurotoxin (EDN) is a small, basic protein that belongs to the ribonuclease A superfamily. EDN displays antiviral activity and causes the neurotoxic Gordon phenomenon when injected into rabbits. Although EDN and ribonuclease A have appreciable structural similarity and a conserved catalytic triad, their peripheral substrate-binding sites are not conserved. The crystal structure of recombinant EDN (rEDN) has been determined at 0.98 A resolution from data collected at a low temperature (100 K). We have refined the crystallographic model of the structure using anisotropic displacement parameters to a conventional R-factor of 0.116. This represents the highest resolution structure of rEDN determined to date and is only the second ribonuclease structure to be determined at a resolution greater than 1.0 A. The structure provides a detailed picture of the conformational freedom at the various subsites of rEDN, and the water structure accounts for more than 50% of the total solvent content of the unit cell. This information will be crucial for the design of tight-binding inhibitors to restrain the ribonucleolytic activity of rEDN.
Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.