X-ray crystal structure of D-xylose isomerase at 4-A resolution.
The structure of D-xylose isomerase from Streptomyces rubiginosus has been determined at 4-A resolution using multiple isomorphous phasing techniques. The folding of the polypeptide chain has been established and consists of two structural domains. The larger domain consists of eight beta-strand alpha-helix (beta alpha) units arranged in a configuration similar to that found for triose phosphate isomerase, 2-keto-3-deoxy-6-phosphogluconate aldolase, and pyruvate kinase. The smaller domain forms a loop away from the larger domain but overlapping the larger domain of another subunit so that a tightly bound dimer is formed. The tetramer then consists of two such dimers. The location of the active site in the enzyme has been tentatively identified from studies using a crystal grown from a solution containing the inhibitor xylitol.[1]References
- X-ray crystal structure of D-xylose isomerase at 4-A resolution. Carrell, H.L., Rubin, B.H., Hurley, T.J., Glusker, J.P. J. Biol. Chem. (1984) [Pubmed]
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