Group I and group II introns Intron

group , group ii introns found in genes encoding proteins (messenger rna), transfer rna , ribosomal rna in wide range of living organisms., following transcription rna, group , group ii introns make extensive internal interactions allow them fold specific, complex three-dimensional architecture. these complex architectures allow group , group ii introns self-splicing, is, intron-containing rna molecule can rearrange own covalent structure precisely remove intron , link exons in correct order. in cases, particular intron-binding proteins involved in splicing, acting in such way assist intron in folding three-dimensional structure necessary self-splicing activity. group , group ii introns distinguished different sets of internal conserved sequences , folded structures, , fact splicing of rna molecules containing group ii introns generates branched introns (like of spliceosomal rnas), while group introns use non-encoded guanosine nucleotide (typically gtp) initiate splicing, adding on 5 -end of excised intron.