title: Studies on conotoxins of Conus betulinus.
abstract: The biological activity and toxicity of crude venom from Conus betulinus, which was collected from the South China Sea, were studied. The venom shows Ach receptor activity, K+ current effect, and low toxicity. Four peptide components, named BeTXIa, BeTXIb, BeTXIIa, and BeTXIIb, were purified by gel-filtration with Sephadex followed by HPLC, and finally sequenced on an ABI model 491 sequencer. The low-molecular-weight peptides BeTXIa and b have 14 and 15 amino acid residues, respectively, while BeTXIIa and b have 27 and 30 amino acid residues, respectively. The results indicate that BeTXs from the venom of C. betulinus are a set of small peptides with a high cysteine content like known conotoxins. However, it is meaningful to find that these sequences have specific chemical characteristics in their cysteine framework which differ greatly from known cysteine frameworks in conotoxin structures.
authors.affiliation: Research Institute of Pharmaceutical Chemistry, Beijing, China. jshchen@home.icm.ac.cn
authors.forename: J S
authors.initials: JS
authors.lastname: Chen
authors.forename: C X
authors.initials: CX
authors.lastname: Fan
authors.forename: K P
authors.initials: KP
authors.lastname: Hu
authors.forename: K H
authors.initials: KH
authors.lastname: Wei
authors.forename: M N
authors.initials: MN
authors.lastname: Zhong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002681:China; D002851:Chromatography, High Pressure Liquid; D020916:Conotoxins / Q000737:chemistry* / Q000302:isolation & purification; D006624:Hippocampus / Q000166:cytology; D066298:In Vitro Techniques; D007928:Lethal Dose 50; D051379:Mice; D008969:Molecular Sequence Data; D008978:Mollusk Venoms / Q000737:chemistry / Q000494:pharmacology / Q000633:toxicity; D018408:Patch-Clamp Techniques; D015221:Potassium Channels / Q000187:drug effects / Q000502:physiology; D017966:Pyramidal Cells / Q000187:drug effects / Q000502:physiology; D051381:Rats; D011950:Receptors, Cholinergic / Q000187:drug effects; D012129:Respiratory Function Tests; D015222:Sodium Channels / Q000187:drug effects / Q000502:physiology
chemical_list: D020916:Conotoxins; D008978:Mollusk Venoms; D015221:Potassium Channels; D011950:Receptors, Cholinergic; D015222:Sodium Channels