HYDROLASE, TRNA-INTRON ENDONUCLEASE, TRNA SPLICING, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI 2CV8 CRYSTAL STRUCTURE OF TRNA-INTRON ENDONUCLEASE FROM SULFOLOBUS TOKODAII