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Crystal Structure and Mutagenic Analysis of GDOsp, a Gentisate 1,2-Dioxygenase from Silicibacter Pomeroyi

¹ National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences;
² State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences;
³ Crystallography Research Program, Oklahoma Medical Research Foundation;
⁴ School of Environmental Science & Engineering, Huazhong University of Science and Technology

(RECEIVED April 18, 2008; ACCEPTED May 14, 2008)

Dioxygenases catalyze dioxygen incorporation into various organic compounds and play a key role in the complex degradation pathway of mono- and polycyclic aromatic and hetero-aromatic compounds. Here we report the crystal structure of gentisate 1,2-dioxygenase from Silicibacter pomeroyi (GDOsp) at a 2.8-angstrom resolution. The enzyme possessed a conserved three dimensional structure of the bicupin family, forming a homo-tetramerization. However, each subunit of GDOsp unusually contained two ferrous centers which were located in its two homologous cupin domains, respectively. Further mutagenic analysis indicated that the enzyme activity of GDOsp depends on the microenvironment in both metal binding sites. Moreover, homologous structural comparison and functional study on GDOsp variants unveiled a group of functionally essential residues and suggested that the active site of the enzyme is located in the amino-terminal domain but could be influenced by changes in the carboxyl domain. Therefore, GDOsp may provide a working model for studying long distance communication within a protein (or its complex).

Keywords: Protein Structure/Folding; Stability and mutagenesis; Enzymes; Active sites; Structure/function studies; Docking Proteins; bicupin folding; extradiol dioxygenase; gentisate 1,2-dioxygenase; long distance communication; mononuclear metal center

⁵ E-mail: zhangc{at}omrf.ouhsc.edu

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