HYDROLASE/RNA, METALLO BETA LACTAMASE FOLD, STRUCTURAL GENOMICS, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI, CYTOPLASM, ENDONUCLEASE, METAL-BINDING, NUCLEASE, RNA-BINDING, RRNA PROCESSING, ZINC, HYDROLASE/RNA COMPLEX 3IE1 CRYSTAL STRUCTURE OF H380A MUTANT TTHA0252 FROM THERMUS THERMOPHILUS HB8 COMPLEXED WITH RNA