CRYSTAL STRUCTURE OF THE COMPLEX BETWEEN S-ADENOSYL HOMOCYSTEINE AND METHANOCALDOCOCCUS JANNASCHI DIM1. 3GRR TRANSFERASE, DIMETHYLADENOSINE TRANSFERASE, ROSSMAN FOLD, RIBOSOMAL ASSEMBLY S-ADENOSYL-L-METHIONINE, RRNA PROCESSING, RNA- BINDING, METHYL TRANSFERASE, METHYLTRANSFERASE, S-ADENOSYL- L-METHIONINE