Structure of xylose isomerase from Streptomyces diastaticus no. 7 strain M1033 at 1.85 A resolution.Zhu, X., Teng, M., Niu, L., Xu, C., Wang, Y.
(2000) Acta Crystallogr.,Sect.D 56: 129-136
- PubMed: 10666592
- Primary Citation of Related Structures:  1QT1
- PubMed Abstract:
- Growth of Single Crystals and Preliminary Analysis of Glucose Isomerase From Streptomyces M1033
Zhang, G.Y.,Niu, L.W.,Huang, W.Z.,Wang, C.,Liu, J.,Cui, Y.,Liu, X.A.,Wang, Y.Z.,Xu, X.,Liang, D.C.
(1991) Chin.Sci.Bull. 36: 1646
- Crystal Structure of Streptomyces diastaticus No.7 Strain M1033 Xylose Isomerase
Zhu, X.,Gong, W.,Niu, L.,Teng, M.,Xu, C.,Wu, C.,Cui, T.,Wang, Y.,Wang, C.
(1996) SCI.CHINA, SER.C: LIFE SCI. 39: 636
The structure of xylose isomerase (XyI) from Streptomyces diastaticus No. 7 strain M1033 (SDXyI) has been refined at 1.85 A resolution to conventional and free R factors of 0.166 and 0.219, respectively. SDXyI was crystallized in space group P2(1)2(1 ...
The structure of xylose isomerase (XyI) from Streptomyces diastaticus No. 7 strain M1033 (SDXyI) has been refined at 1.85 A resolution to conventional and free R factors of 0.166 and 0.219, respectively. SDXyI was crystallized in space group P2(1)2(1)2, with unit-cell parameters a = 87.976, b = 98.836, c = 93.927 A. One dimer of the tetrametric molecule is found in each asymmetric unit. Each monomer consists of two domains: a large N-terminal domain (residues 1-320), containing a parallel eight-stranded alpha/beta barrel, and a small C-terminal loop (residues 321-387), containing five helices linked by random coil. The four monomers are essentially identical in the tetramer, possessing non-crystallographic 222 symmetry with one twofold axis essentially coincident with the crystallographic twofold axis in the space group P2(1)2(1)2, which may explain why the diffraction pattern has strong pseudo-I222 symmetry even at medium resolution. The crystal structures of XyIs from different bacterial strains, especially from Streptomyces, are similar. The alpha2 helix of the alpha/beta barrel has a different position in the structures of different XyIs. The conformation of C-terminal fragment 357-364 in the SDXyI structure has a small number of differences to that of other XyIs. Two Co(2+) ions rather than Mg(2+) ions exist in the active site of the SDXyI structure; SDXyI seems to prefer to bind Co(2+) ions rather than Mg(2+) ions.
Department of Molecular Biology, School of Life Sciences, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China.