Part:BBa_M50048

This is a riboswitch consisting of an untranslated region at the 5' end (5' UTR), an RNA aptamer that recognizes atrazine, and a ribosome binding site. It is based on BBa_K784005, with the theophylline aptamer exchanged for an atrazine aptamer. In the absence of atrazine, the RNA transcript of this part has excessive base pairing in the 5’ UTR, folding the RNA to block binding at the RBS and thus prevent translation. When atrazine is present, it binds to the aptamer sequence, altering the shape of the transcript to expose the RBS and allow translation of any downstream protein sequences.