1hue
From Proteopedia
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HISTONE-LIKE PROTEIN
Overview
The histone-like protein HU from Bacillus stearothermophilus is a dimer, with a molecular mass of 19.5 kDa that is capable of bending DNA. An X-ray, structure has been determined, but no structure could be established for a, large part of the supposed DNA-binding beta-arms. Using distance and, dihedral constraints derived from triple-resonance NMR data of a 13C/15N, doubly-labelled HU protein 49 distance geometry structures were, calculated, which were refined by means of restrained Molecular Dynamics., From this set a total of 25 refined structures were selected having low, constraint energy and few constraint violations. The ensemble of 25, structures display a root-mea-square co-ordinate deviation of 0.36 A with, respect to the average structure, calculated over the backbone heavy atoms, of residues 2 to 54 and 75 to 90 (and residues 2' to 54' and 75' to 90' of, the second monomer). The structure of the core is very similar to that, observed in the X-ray structure, with a pairwise r.m.s.d. of 1.06 A. The, structure of the beta-hairpin arm contains a double flip-over at the, prolines in the two strands of the beta-arm. Strong 15N-NH heteronuclear, nuclear Overhauser effects indicate that the beta-arm and especially the, tip is flexible. This explains the disorder observed in the solution and, X-ray structures of the beta-arm, in respect of the core of the protein., Overlayed onto itself the beta-arm is better defined, with an r.m.s.d. of, 1.0 A calculated over the backbone heavy atoms of residues 54 to 59 and 69, to 74. The tip of the arm adopts a well-defined 4:6 beta-hairpin, conformation similar to the iron co-ordinating beta-arms of rubredoxin.
About this Structure
1HUE is a Single protein structure of sequence from Geobacillus stearothermophilus. Full crystallographic information is available from OCA.
Reference
Solution structure of the HU protein from Bacillus stearothermophilus., Vis H, Mariani M, Vorgias CE, Wilson KS, Kaptein R, Boelens R, J Mol Biol. 1995 Dec 8;254(4):692-703. PMID:7500343
Page seeded by OCA on Tue Nov 20 16:49:49 2007
