1GUR

GURMARIN, A SWEET TASTE-SUPPRESSING POLYPEPTIDE, NMR, 10 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 10 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 297-305


  • PubMed Abstract: 
  • The solution structure of gurmarin was studied by two-dimensional proton NMR spectroscopy at 600 MHz. Gurmarin, a 35-amino acid residue polypeptide recently discovered in an Indian-originated tree Gymnema sylvestre, selectively suppresses the neural ...

    The solution structure of gurmarin was studied by two-dimensional proton NMR spectroscopy at 600 MHz. Gurmarin, a 35-amino acid residue polypeptide recently discovered in an Indian-originated tree Gymnema sylvestre, selectively suppresses the neural responses of rat to sweet taste stimuli. Sequence-specific resonance assignments were obtained for all backbone protons and for most of the side-chain protons. The three-dimensional solution structure was determined by simulated-annealing calculations on the basis of 135 interproton distance constraints derived from NOEs, six distance constraints for three hydrogen bonds and 16 dihedral angle constraints derived from coupling constants. A total of 10 structures folded into a well-defined structure with a triple-stranded antiparallel beta-sheet. The average rmsd values between any two structures were 1.65 +/- 0.39 A for the backbone atoms (N, C alpha, C) and 2.95 +/- 0.27 A for all heavy atoms. The positions of the three disulfide bridges, which could not be determined chemically, were estimated to be Cys3-Cys18, Cys10-Cys23 and Cys17-Cys33 on the basis of the NMR distance constraints. This disulfide bridge pattern in gurmarin turned out to be analogous to that in omega-conotoxin and Momordica charantia trypsin inhibitor-II, and the topology of folding was the same as that in omega-conotoxin.


    Related Citations: 
    • 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
    • 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


    Organizational Affiliation

    Department of Chemistry, Faculty of Science, Kyoto University, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GURMARIN
A
35Gymnema sylvestreMutation(s): 0 
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 Submitted: 10 
  • Olderado: 1GUR Olderado
Software Package:
Software NamePurpose
AMBERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-08-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance