TRANSFERASE, DIMETHYLADENOSINE TRANSFERASE, ROSSMAN FOLD, RNA METHYLASE, RIBOSOMAL ASSEMBLY, METHYLTRANSFERASE, RNA-BINDING, RRNA PROCESSING, S-ADENOSYL-L-METHIONINE 3FYC CRYSTAL STRUCTURE OF DIM1 FROM THE THERMOPHILIC ARCHEON, METHANOCALDOCOCCUS JANNASCHI