Renaturation of neurotoxin B-IV from the heteronemertine Cerebratulus lacteus.
The heteronemertine Cerebratulus lacteus synthesizes a family of four structurally homologous, crustacean-selective polypeptide toxins (B-toxins) which affect action potential generation in nervous issue. The most abundant homolog, toxin B-IV, is completely inactivated by reduction of its four disulfide bands. Reduction is also accompanied by loss of secondary structure. Reoxidation of the reduced protein may be catalyzed by the oxidized forms of glutathione or dithiothreitol. Secondary structure and toxicity are recovered in parallel; the terminally reoxidized protein regains approximately 75% of both the neurotoxicity and the secondary structure of native B-IV.
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D005612:Freeze Drying; D008387:Marine Toxins / Q000032:analysis*; D051379:Mice; D010084:Oxidation-Reduction; D013438:Sulfhydryl Compounds / Q000032:analysis; D014020:Tissue Extracts / Q000633:toxicity
D000596:Amino Acids; C028056:Cerebratulus lacteus toxin B-IV; D008387:Marine Toxins; D013438:Sulfhydryl Compounds; D014020:Tissue Extracts