Enables small ribosomal subunit rRNA binding activity. Involved in mature ribosome assembly; positive regulation of mitochondrial translation; and rRNA methylation. Located in mitochondrion. Is expressed in several structures, including branchial arch; central nervous system; limb bud; neural ectoderm; and sensory organ. Orthologous to human NSUN4 (NOP2/Sun RNA methyltransferase 4). [provided by Alliance of Genome Resources, Apr 2022]