1NJO THE CRYSTAL STRUCTURE OF THE 50S LARGE RIBOSOMAL SUBUNIT FROM DEINOCOCCUS RADIODURANS COMPLEXED WITH A SHORT SUBSTRATE ANALOG ACCPUROMYCIN (ACCP) RIBOSOME, RIBOSOMES, TRNA, PUROMYCIN, SPARSOMYCIN, PEPTIDYL- TRANSFERASE, PEPTIDE BOND FORMATION