ISSN:
1573-5001
Keywords:
cross validation
;
data redundance
;
φ torsion angle
;
vicinal coupling constants
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
Abstract The concept of self-consistent J coupling evaluation exploits redundant structure information inherent in large sets of 3J coupling constants. Application to the protein Desulfovibrio vulgaris flavodoxin demonstrates the simultaneous refinement of torsion-angle values and related Karplus coefficients. The experimental basis includes quantitative coupling constants related to the polypeptide backbone φ torsion originating from a variety of heteronuclear 2D and 3D NMR correlation experiments, totalling 124 3J(HN,Hα), 129 3J(HN,C′), 121 3J(HN,Cβ), 128 3J(C′i−1,Hαi), 121 3J(C′i−1,C′i), and 122 3J(C′i−1,Cβi). Without prior knowledge from either X-ray crystallography or NMR data, such as NOE distance constraints, accurate φ dihedral angles are specified for 122 non-glycine and non-proline residues out of a total of 147 amino acids. Different models of molecular internal mobility are considered. The Karplus coefficients obtained are applicable to the conformational analysis of φ torsions in other polypeptides.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008345303942
