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| Description: (a) In tryptophan abundance, the 3–4 (termination) stem loop terminates transcription after the poly-U string. (b) In tryptophan starvation, the 2–3 (antitermination) stem loop leads to polycistronic mRNA synthesis(a) In tryptophan abundance, the 3–4 (termination) stem loop terminates transcription after the poly-U string. (b) In tryptophan starvation, the 2–3 (antitermination) stem loop leads to polycistronic mRNA synthesis (a) Tryptophan abundance: Termination ‘uunununnt—nth Region 4 Ribosome completes translation of trpL coding sequence and occupies regions 1 and 2. Regions 3 and 4 pair, and transcription terminates. (b) Tryptophan starvation: Antitermination Region 4 W‘""“"~"HGA 4* “‘1"V‘lI/Hv‘yvfldqflfiiiilllllIItIICIIII—ttal“ Ribosome stalls at region 1, and regions 2 and 3 pair. Transcription continues into operon l l polypeptide region Picture Stats: Views: 74 Filesize: 636.76kB Height: 2144 Width: 1564 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49281 |