1bw3
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(New page: 200px<br /><applet load="1bw3" size="450" color="white" frame="true" align="right" spinBox="true" caption="1bw3" /> '''THREE-DIMENSIONAL STRUCTURE IN SOLUTION OF B...)
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Revision as of 09:50, 20 November 2007
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THREE-DIMENSIONAL STRUCTURE IN SOLUTION OF BARWIN, A PROTEIN FROM BARLEY SEED
Overview
The solution structure of a 125-residue basic protein, barwin, has been, determined using 1H nuclear magnetic resonance spectroscopy. This protein, is closely related to domains in proteins encoded by wound-induced genes, in plants. Analysis of the 1H nuclear Overhauser spectrum revealed the, assignment of more than 1400 nuclear Overhauser effects. Twenty structures, were calculated based on 676 nontrivial distance restraints, 152 torsion, angle restraints (92 phi, 56 chi 1, and 4 omega for proline), and, stereospecific assignments of 38 chiral centers, using distance geometry, simulated annealing, and restrained energy minimization. None of the, distance restraints was violated by more than 0.5 A in any of the 20, structures, and none of the torsion angle restraints was violated by more, than 1 degree in any of the structures. The RMS difference between the, calculated and target interproton distance restraints is 0.033 A, and the, average atomic RMS differences between the 20 structures and their, geometric average are 1.23 A for backbone atoms and 1.73 A for all heavy, atoms. The dominating structural feature of the protein is a well-defined, four-stranded antiparallel beta-sheet, two parallel beta-sheets packed, antiparallel to each other and four short alpha-helices. The binding site, of barwin to the tetramer N-acetylglucosamine has been qualitatively, investigated, and the dissociation constant of the complex has been, determined using one-dimensional 1H nuclear magnetic resonance, spectroscopy.
About this Structure
1BW3 is a Single protein structure of sequence from Hordeum vulgare. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure in solution of barwin, a protein from barley seed., Ludvigsen S, Poulsen FM, Biochemistry. 1992 Sep 22;31(37):8783-9. PMID:1390665
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