This is the first of two distinct C-terminal domains of the 16S rRNA methyltransferase RsmF. It is necessary for stabilising the catalytic core, Pfam:PF01189.

1: The structure of the RNA m5C methyltransferase YebU from Escherichia coli reveals a C-terminal RNA-recruiting PUA domain. Hallberg BM, Ericsson UB, Johnson KA, Andersen NM, Douthwaite S, Nordlund P, Beuscher AE 4th, Erlandsen H; J Mol Biol. 2006;360:774-787. PMID:16793063

2: Multi-site-specific 16S rRNA methyltransferase RsmF from Thermus thermophilus. Demirci H, Larsen LH, Hansen T, Rasmussen A, Cadambi A, Gregory ST, Kirpekar F, Jogl G; RNA. 2010;16:1584-1596. PMID:20558545