1I25

Three dimensional solution structure of huwentoxin-II by 2D 1H-NMR


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The structure of spider toxin huwentoxin-II with unique disulfide linkage: evidence for structural evolution.

Shu, Q.Lu, S.Y.Gu, X.C.Liang, S.P.

(2002) Protein Sci 11: 245-252

  • DOI: 10.1110/ps.30502
  • Primary Citation of Related Structures:  
    1I25

  • PubMed Abstract: 
  • The three-dimensional structure of huwentoxin-II (HWTX-II), an insecticidal peptide purified from the venom of spider Selenocosmia huwena with a unique disulfide bond linkage as I-III, II-V, and IV-VI, has been determined using 2D (1)H-NMR. The resul ...

    The three-dimensional structure of huwentoxin-II (HWTX-II), an insecticidal peptide purified from the venom of spider Selenocosmia huwena with a unique disulfide bond linkage as I-III, II-V, and IV-VI, has been determined using 2D (1)H-NMR. The resulting structure of HWTX-II contains two beta-turns (C4-S7 and K24-W27) and a double-stranded antiparallel beta-sheet (W27-C29 and C34-K36). Although the C-terminal double-stranded beta-sheet cross-linked by two disulfide bonds (II-V and IV-VI in HWTX-II, II-V and III-VI in the ICK molecules) is conserved both in HWTX-II and the ICK molecules, the structure of HWTX-II is unexpected absence of the cystine knot because of its unique disulfide linkage. It suggests that HWTX-II adopts a novel scaffold different from the ICK motif that is adopted by all other spider toxin structures elucidated thus far. Furthermore, the structure of HWTX-II, which conforms to the disulfide-directed beta-hairpin (DDH) motif, not only supports the hypothesis that the ICK is a minor elaboration of the more ancestral DDH motif but also suggests that HWTX-II may have evolved from the same structural ancestor.


    Related Citations: 
    • Sequence-specific Assignment of 1H-NMR Resonance and Determination of the Secondary Structure of HWTX-II
      Shu, Q., Lu, S.Y., Gu, X.C., Liang, S.P.
      (2001) Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao (Shanghai) 33: 65
    • Assignment of Disulfide Bonds of Huwentoxin-II by Edman Degradation Sequencing and Stepwise Thiol Modification
      Shu, Q., Huang, R.H., Liang, S.P.
      () To be published --: --
    • Purification and Characterization of Huwentoxin-II, a Neurotoxic Peptide from the Venom of the Chinese Bird Spider Selenocosmia huwena
      Shu, Q., Liang, S.P.
      (1999) J Pept Res 53: 486

    Organizational Affiliation

    Life Science College, Peking University, Beijing 100871, People's Republic of China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HUWENTOXIN-IIA37Haplopelma schmidtiMutation(s): 0 
Find proteins for P82959 (Cyriopagopus schmidti)
Explore P82959 
Go to UniProtKB:  P82959
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1I25 Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-02-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations