Journal
CRYSTALLOGRAPHY REPORTS
Volume 45, Issue 1, Pages 105-116Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/1.171145
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The crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 Angstrom resolution, respectively. The atomic models of the molecules were refined to the R factors 9.8 and 10%, respectively. The three-dimensional molecular structures are characterized in detail. The analysis of electron-density distributions in the active centers of the native and inhibited enzyme forms revealed that the most flexible side chains of the amino acid residues Lys162 and Glu36 exist in two interrelated conformations. This allowed us to obtain the structural data necessary for understanding the mechanism of enzymatic activity of the dimanganese catalase. (C) 2000 MAIK Nauka/Interperiodica.
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