Backbone folding of the polypeptide cardiac stimulant anthopleurin-A determined by nuclear magnetic resonance, distance geometry and molecular dynamics

Andrew E. Torda, Bridget C. Mabbutt, Wilfred F. van Gunsteren, Raymond S. Norton

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The solution conformation of the cardiac stimulatory sea anemone polypeptide anthopleurin-A has been characterised using distance geometry and restrained molecular dynamics calculations. A set of 253 approximate interproton distance restraints and 14 peptide backbone torsion angle restraints derived from two-dimensional 1H-NMR spectra at 500 MHz were used as input for these calculations. 13 structures generated by either metric matrix or variable target function distance geometry calculations were refined using energy minimisation and restrained molecular dynamics. The resulting structures contain a region of twisted antiparellel β-sheet to which two separate regions of unordered chain are linked by three disulphide bonds. Two loops, one including Pro-41 and the other encompassing residues 10-18, are poorly defined by the NOE data.

Original languageEnglish
Pages (from-to)266-270
Number of pages5
JournalFEBS Letters
Issue number2
Publication statusPublished - 7 Nov 1988
Externally publishedYes


  • H-NMR
  • Distance geometry
  • Molecular dynamics
  • NOE
  • Polypeptide
  • Three-dimensional structure

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