1C4E

GURMARIN FROM GYMNEMA SYLVESTRE


Experimental Data Snapshot

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

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This is version 2.0 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

  • DOI: 10.1046/j.1432-1327.1999.00659.x
  • Primary Citation of Related Structures:  
    1C4E

  • 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 tastants in rats ...

    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
    • 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 111: 109
    • 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 Comp Physiol 100: 309

    Organizational Affiliation

    Department of Biochemistry, University of Sydney, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (GURMARIN)A35Gymnema sylvestreMutation(s): 0 
UniProt
Find proteins for P25810 (Gymnema sylvestre)
Explore P25810 
Go to UniProtKB:  P25810
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-08-27
    Type: Initial release
  • Version 1.1: 2008-04-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations
  • Version 2.0: 2019-12-25
    Changes: Database references, Derived calculations, Polymer sequence