1C4E

GURMARIN FROM GYMNEMA SYLVESTRE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

High-resolution solution structure of gurmarin, a sweet-taste-suppressing plant polypeptide.

Fletcher, J.I.Dingley, A.J.Smith, R.Connor, M.Christie, M.J.King, G.F.

(1999) Eur.J.Biochem. 264: 525-533


  • PubMed Abstract: 
  • Gurmarin is a 35-residue polypeptide from the Asclepiad vine Gymnema sylvestre. It has been utilised as a pharmacological tool in the study of sweet-taste transduction because of its ability to selectively inhibit the neural response to sweet tastant ...

    Gurmarin is a 35-residue polypeptide from the Asclepiad vine Gymnema sylvestre. It has been utilised as a pharmacological tool in the study of sweet-taste transduction because of its ability to selectively inhibit the neural response to sweet tastants in rats. We have chemically synthesised and folded gurmarin and determined its three-dimensional solution structure to high resolution using two-dimensional NMR spectroscopy. Structure calculations utilised 612 interproton-distance, 19 dihedral-angle, and 18 hydrogen-bond restraints. The structure is well defined for residues 3-34, with backbone and heavy atom rms differences of 0.27 +/- 0.09 A and 0.73 +/- 0.09 A, respectively. Gurmarin adopts a compact structure containing an antiparallel beta-hairpin (residues 22-34), several well-defined beta-turns, and a cystine-knot motif commonly observed in toxic and inhibitory polypeptides. Despite striking structural homology with delta-atracotoxin, a spider neurotoxin known to slow the inactivation of voltage-gated Na+ channels, we show that gurmarin has no effect on a variety of voltage-sensitive channels.


    Related Citations: 
    • Three-Dimensional Structure of Gurmarin, a Sweet Taste-Suppressing Polypeptide
      Arai, K.,Ishima, R.,Morikawa, S.,Miyasaka, A.,Imoto, T.,Yoshimura, S.,Aimoto, S.,Akasaka, K.
      (1995) J.Biomol.NMR 5: 297
    • A Novel Peptide Isolated from the Leaves of Gymnema Sylvestre-I. Characterization and its Suppressive Effect on the Neural Responses to Sweet Taste Stimuli in the Rat
      Imoto, T.,Miyasaka, A.,Ishima, R.,Akasaka, K.
      (1991) COMP.BIOCHEM.PHYSIOL. A: PHYSIOL. 100: 309
    • Amino Acid Sequence of Sweet-Taste-Suppressing Peptide (Gurmarin) from the Leaves of Gymnema Sylvestre
      Kamei, K.,Takano, R.,Miyasaka, A.,Imoto, T.,Hara, S.
      (1992) J.Biochem.(Tokyo) 111: 109


    Organizational Affiliation

    Department of Biochemistry, University of Sydney, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (GURMARIN)
A
35Gymnema sylvestreN/A
Find proteins for P25810 (Gymnema sylvestre)
Go to UniProtKB:  P25810
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 
  • Olderado: 1C4E Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-08-27
    Type: Initial release
  • Version 1.1: 2008-04-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations