5ebx | pdb_00005ebx

THE CRYSTAL STRUCTURE OF ERABUTOXIN A AT 2.0 ANGSTROMS RESOLUTION

spinqualitylabelsall models 5ebx, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ebx is a 1 chain structure with sequence from Black-banded sea krait. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 3ebx Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [NXSA_PSSEM] Binds with high affinity to muscular nicotinic acetylcholine receptors (nAChRs) and with low affinity to neuronal alpha-7 nAChRs and inhibit acetylcholine from binding to the receptor, thereby impairing neuromuscular transmission. Produces peripheral paralysis by blocking neuromuscular transmission at the postsynaptic site. Blocks the extracellular increase of dopamine evoked by nicotine at 4.2 uM concentrations. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The three-dimensional structure of erabutoxin a, a single-chain, 62-residue protein neurotoxin from snake venom, has been determined to 2.0-A resolution by x-ray crystal structure analysis. Molecular replacement methods were used, and the structure refined to a residual R = 0.17. The sites of 62 water molecules and 1 sulfate ion have been located and refined. The structure of erabutoxin a is very similar to that established earlier for erabutoxin b. These toxins from venom of the same snake differ in sequence only at residue 26, which is Asn in erabutoxin a and His in erabutoxin b. The substitution leads to only minor variations in intramolecular hydrogen bonding. Furthermore, the distribution of thermal parameters and the implied regional mobilities are similar in the two structures. In particular, the highly mobile character of the peripheral segment Pro44-Gly49 in both structures supports the specific role proposed for this segment in neurotoxin binding to the acetylcholine receptor. Forty-eight of the solvent sites determined are first surface positions; approximately one-half of these are equivalent to solvent sites in erabutoxin b. The crystal structure of erabutoxin a at 2.0-A resolution.,Corfield PW, Lee TJ, Low BW J Biol Chem. 1989 Jun 5;264(16):9239-42. PMID:2722828 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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