Specifically methylates the 2'-O-ribose position of uridine-2479 in 23S ribosomal RNA. Confers resistance to antibiotic avilamycin, an orthosomycin antibiotic. S-adenosyl-L-methionine + uridine(2479) in 23S rRNA = 2'-O-methyluridine(2479) in 23S rRNA + H(+) + S-adenosyl-L-homocysteine Homodimer. Belongs to the class IV-like SAM-binding methyltransferase superfamily. RNA methyltransferase TsnR/AvirB family.