N-terminal RNA binding domain of the methyltransferase Sun. The rRNA-specific 5-methylcytidine transferase Sun, also known as RrmB or Fmu shares the RNA-binding non-catalytic domain with the transcription termination factor NusB. The precise biological role of this domain in Sun is unknown, although it is likely to be involved in sequence-specific RNA binding. The C-terminal methyltransferase domain of Sun has been shown to catalyze formation of m5C at position 967 of 16S rRNA in Escherichia coli.
Jiyao W et al.(2023). "The conserved domain database in 2023.",