1ad7
From Proteopedia
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|PDB= 1ad7 |SIZE=350|CAPTION= <scene name='initialview01'>1ad7</scene> | |PDB= 1ad7 |SIZE=350|CAPTION= <scene name='initialview01'>1ad7</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=NH2:AMINO GROUP'>NH2</scene> | + | |LIGAND= <scene name='pdbligand=CGU:GAMMA-CARBOXY-GLUTAMIC+ACID'>CGU</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ad7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ad7 OCA], [http://www.ebi.ac.uk/pdbsum/1ad7 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ad7 RCSB]</span> | ||
}} | }} | ||
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[[Category: Furie, B C.]] | [[Category: Furie, B C.]] | ||
[[Category: Rigby, A C.]] | [[Category: Rigby, A C.]] | ||
| - | [[Category: NH2]] | ||
[[Category: conantokin g]] | [[Category: conantokin g]] | ||
[[Category: conotoxin]] | [[Category: conotoxin]] | ||
[[Category: gamma-carboxyglutamic acid]] | [[Category: gamma-carboxyglutamic acid]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 18:37:50 2008'' |
Revision as of 15:37, 30 March 2008
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| Ligands: | , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
NMR STRUCTURE OF METAL-FREE CONANTOKIN G, 1 STRUCTURE
Overview
Conantokin G is a gamma-carboxyglutamic acid-containing conotoxin from the venom of the marine cone snail Conus geographus. The 17-residue peptide, which contains five gamma-carboxyglutamic acid (Gla) residues and an amidated C-terminal asparagine amide, was synthesized chemically in a form identical to the natural conantokin G. To gain insight into the role of gamma-carboxyglutamic acid in the structure of this peptide, we determined the three-dimensional structure of conantokin G by 1H NMR and compared its structure to other conotoxins and to the gamma-carboxyglutamic acid-containing regions of the vitamin K-dependent blood-clotting proteins. Complete resonance assignments were made by two-dimensional 1H NMR spectroscopy in the absence of metal ions. NOE cross-peaks d(alphaN), d(NN), and d(betaN) provided interproton distance information, and vicinal spin-spin coupling constants 3J(HN alpha) were used to calculate phi torsion angles. Distance geometry and simulated annealing methods were used to derive 20 convergent structures from a set of 227 interproton distance restraints and 13 torsion angle measurements. The backbone rmsd to the geometric average for 20 final structures is 0.8 +/- 0.1 A. Conantokin G consists of a structured region commencing at Gla 3 and extending through arginine 13. This structure includes a partial loop centered around Gla 3 and Gla 4, a distorted type I turn between glutamine 6 and glutamine 9, and two type I turns involving Gla 10, leucine 11, and isoleucine 12 and arginine 13. Together, these two turns define approximately 1.6 turns of a distorted 3(10) helix. The observed structure possesses structural elements similar to those seen in the disulfide-linked conotoxins.
About this Structure
1AD7 is a Single protein structure of sequence from Conus geographus. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of a gamma-carboxyglutamic acid-containing conotoxin, conantokin G, from the marine snail Conus geographus: the metal-free conformer., Rigby AC, Baleja JD, Furie BC, Furie B, Biochemistry. 1997 Jun 10;36(23):6906-14. PMID:9188685
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