title: Solution structure of BmP01 from the venom of scorpion Buthus martensii Karsch.
abstract: From the venom of scorpion Buthus martensii Karsch,a short peptide (BmP01, 29 amino acid residues) was isolated and characterized as previously reported (Lebren, R. R., et al. (1997) Eur. J. Biochem. 245, 457-464). It was shown to reduce 33% outward K(+) channel (hippocampal neurons) currents at 10 microM. The solution structure of BmP01 was determined by 2D (1)H NMR spectroscopy. The NOEs, coupling constants, and H-D exchange obtained from NMR spectroscopy were used in structural calculations. The conformation of BmP01 is composed of a short alpha-helix (Cys 3-Thr 12) and a two-stranded antiparallel beta-sheet (Ala 15-Asp 20 and Lys 23-Pro 28). There are three disulfide bridges (Cys 3-Cys 19, Cys 6-Cys 24 and Cys 10-Cys 26) connecting the alpha-helix and beta-sheet. Asp 20 to Lys 23 form a type II turn linking the two strands. Structural and electrostatic potential comparison between BmP01 and its analogues are also presented.
authors.affiliation: State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Shanghai, 200032, China.
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Wei
authors.forename: F
authors.initials: F
authors.lastname: He
authors.forename: S
authors.initials: S
authors.lastname: Jiang
authors.forename: G
authors.initials: G
authors.lastname: Hu
authors.forename: H
authors.initials: H
authors.lastname: Wu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003058:Cockroaches / Q000187:drug effects / Q000378:metabolism; D003545:Cysteine / Q000737:chemistry / Q000378:metabolism; D004220:Disulfides / Q000378:metabolism; D004553:Electric Conductivity; D006624:Hippocampus; D015640:Ion Channel Gating / Q000187:drug effects; D008297:Male; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular; D018408:Patch-Clamp Techniques; D011188:Potassium / Q000378:metabolism; D026902:Potassium Channel Blockers; D015221:Potassium Channels / Q000378:metabolism; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D012604:Scorpion Venoms / Q000737:chemistry* / Q000302:isolation & purification / Q000633:toxicity; D016415:Sequence Alignment; D012996:Solutions; D055672:Static Electricity; D013329:Structure-Activity Relationship
chemical_list: C106377:BmP01 toxin; D004220:Disulfides; D026902:Potassium Channel Blockers; D015221:Potassium Channels; D012604:Scorpion Venoms; D012996:Solutions; D003545:Cysteine; D011188:Potassium