1rgd

Publication Abstract from PubMed

The solution structure of the glucocorticoid receptor (GR) DNA-binding domain (DBD), consisting of 93 residues, has been refined from two and three-dimensional NMR data using an ensemble iterative relaxation matrix approach followed by direct NOE refinement with DINOSAUR. A set of 47 structures of the rat GR fragment Cys440-Arg510 was generated with distance geometry and further refined with a combination of restrained energy minimization and restrained molecular dynamics in a parallel refinement protocol. Distance constraints were obtained from an extensive set of NOE build-up curves in H2O and 2H2O via relaxation matrix calculations (1186 distance constraints from NOE intensities, 10 phi and 22 chi 1 dihedral angle constraints from J- coupling data were used for the calculations). The root-mean-square deviation values of the 11 best structures on the well-determined part of the protein (Cys440 to Ser448, His451 to Glu469 and Pro493 to Glu508) are 0.60 A and 1.20 A from the average for backbone and all heavy atoms, respectively. The final structures have R-factors around 0.40 and good stereochemical qualities. The first zinc-coordinating domain of the GR DBD is very similar to the crystal structure with a root-mean-square difference of 1.4 A. The second zinc-coordinating domain is still disordered in solution. No secondary structure element is found in this domain in the free state. As suggested by crystallographic studies on the estrogen receptor DBD-DNA and GR DBD-DNA complexes, part of this region will form a distorted helix and the D-box will undergo a conformational change upon cooperative binding to DNA.

Structure refinement of the glucocorticoid receptor-DNA binding domain from NMR data by relaxation matrix calculations.,van Tilborg MA, Bonvin AM, Hard K, Davis AL, Maler B, Boelens R, Yamamoto KR, Kaptein R J Mol Biol. 1995 Apr 7;247(4):689-700. PMID:7723024^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.