rRNA small subunit aminocarboxypropyltransferase activity
rrna small subunit aminocarboxypropyltransferase activity
Catalysis of the reaction: N1-methylpseudouridine in small subunit rRNA + S-adenosyl-L-methionine = H+ + N1-methyl-N3-[(3S)-3-amino-3-carboxypropyl]pseudouridine in small subunit rRNA + S-methyl-5'-thioadenosine.