rrNa processing in eukaryotes The precursor folds and complexes with proteins RNP as it is being transcribed in the nucleolus Many specific ribose methylations take place at over 100 sites and is carried out directly b by a subset of snRNP particles snrnps contain snrnas that have short streches of complementarity to parts of the rRNA and, by base pairing with it, they define where methylation takes place pre-rRNa processing is accompanied by the formation of 6os and 40s subunitsrRNA processing in eukaryotes • The precursor folds and complexes with proteins RNP as it is being transcribed in the nucleolus • Many specific ribose methylations take place at over 100 sites and is carried out directly by a subset of snRNP particles • snRNPs contain snRNAs that have short streches of complementarity to parts of the rRNA and, by base pairing with it, they define where methylation takes place • pre-rRNA processing is accompanied by the formation of 60S and 40S subunits