1gur
From Proteopedia
| Line 1: | Line 1: | ||
| - | [[Image:1gur.gif|left|200px]] | + | [[Image:1gur.gif|left|200px]] |
| - | + | ||
| - | '''GURMARIN, A SWEET TASTE-SUPPRESSING POLYPEPTIDE, NMR, 10 STRUCTURES''' | + | {{Structure |
| + | |PDB= 1gur |SIZE=350|CAPTION= <scene name='initialview01'>1gur</scene> | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''GURMARIN, A SWEET TASTE-SUPPRESSING POLYPEPTIDE, NMR, 10 STRUCTURES''' | ||
| + | |||
==Overview== | ==Overview== | ||
| Line 7: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | 1GUR is a [ | + | 1GUR is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gymnema_sylvestre Gymnema sylvestre]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GUR OCA]. |
==Reference== | ==Reference== | ||
| - | 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, J Biomol NMR. 1995 Apr;5(3):297-305. PMID:[http:// | + | 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, J Biomol NMR. 1995 Apr;5(3):297-305. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7787425 7787425] |
[[Category: Gymnema sylvestre]] | [[Category: Gymnema sylvestre]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| Line 23: | Line 32: | ||
[[Category: sweet-taste]] | [[Category: sweet-taste]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:28:11 2008'' |
Revision as of 09:28, 20 March 2008
| |||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
GURMARIN, A SWEET TASTE-SUPPRESSING POLYPEPTIDE, NMR, 10 STRUCTURES
Overview
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.
About this Structure
1GUR is a Single protein structure of sequence from Gymnema sylvestre. Full crystallographic information is available from OCA.
Reference
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, J Biomol NMR. 1995 Apr;5(3):297-305. PMID:7787425
Page seeded by OCA on Thu Mar 20 11:28:11 2008
