1KQI

NMR Solution Structure of the trans Pro30 Isomer of ACTX-Hi:OB4219


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations, structures with the lowest energy 

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This is version 1.2 of the entry. See complete history


Literature

Solution structures of the cis- and trans-Pro30 isomers of a novel 38-residue toxin from the venom of Hadronyche Infensa sp. that contains a cystine-knot motif within its four disulfide bonds

Rosengren, K.J.Wilson, D.Daly, N.L.Alewood, P.F.Craik, D.J.

(2002) Biochemistry 41: 3294-3301

  • DOI: 10.1021/bi011932y
  • Primary Citation of Related Structures:  
    1KQI, 1KQH

  • PubMed Abstract: 
  • The primary sequence and three-dimensional structure of a novel peptide toxin isolated from the Australian funnel-web spider Hadronyche infensa sp. is reported. ACTX-Hi:OB4219 contains 38 amino acids, including eight-cysteine residues that form four disulfide bonds ...

    The primary sequence and three-dimensional structure of a novel peptide toxin isolated from the Australian funnel-web spider Hadronyche infensa sp. is reported. ACTX-Hi:OB4219 contains 38 amino acids, including eight-cysteine residues that form four disulfide bonds. The connectivities of these disulfide bonds were previously unknown but have been unambiguously determined in this study. Three of these disulfide bonds are arranged in an inhibitor cystine-knot (ICK) motif, which is observed in a range of other disulfide-rich peptide toxins. The motif incorporates an embedded ring in the structure formed by two of the disulfides and their connecting backbone segments penetrated by a third disulfide bond. Using NMR spectroscopy, we determined that despite the isolation of a single native homologous product by RP-HPLC, ACTX-Hi:OB4219 possesses two equally populated conformers in solution. These two conformers were determined to arise from cis/trans isomerization of the bond preceding Pro30. Full assignment of the NMR spectra for both conformers allowed for the calculation of their structures, revealing the presence of a triple-stranded antiparallel beta sheet consistent with the inhibitor cystine-knot (ICK) motif.


    Organizational Affiliation

    Institute for Molecular Bioscience, ARC Special Research Centre for Functional and Applied Genomics, University of Queensland, Brisbane QLD 4072, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACTX-Hi:OB4219A38Hadronyche infensaMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P60272 (Hadronyche infensa)
Explore P60272 
Go to UniProtKB:  P60272
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations, structures with the lowest energy 
  • OLDERADO: 1KQI Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-02-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance