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  2. Attenuator (genetics) - Wikipedia

    en.wikipedia.org/wiki/Attenuator_(genetics)

    The attenuator sequence, which is located between the mRNA leader sequence (5' UTR) and trp operon gene sequence, contains four domains, where domain 3 can pair with domain 2 or domain 4. The attenuator sequence at domain 1 contains instruction for peptide synthesis that requires tryptophans. A high level of tryptophan will permit ribosomes to ...

  3. trp operon - Wikipedia

    en.wikipedia.org/wiki/Trp_operon

    At the beginning of the transcribed genes of the trp operon is a sequence of at least 130 nucleotides termed the leader transcript (trpL; 4] Lee and Yanofsky (1977) found that the attenuation efficiency is correlated with the stability of a secondary structure embedded in trpL, [ 5 ] and the 2 constituent hairpins of the terminator structure ...

  4. Operon - Wikipedia

    en.wikipedia.org/wiki/Operon

    A typical operon. In genetics, an operon is a functioning unit of DNA containing a cluster of genes under the control of a single promoter. [1] The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product.

  5. Histidine operon leader - Wikipedia

    en.wikipedia.org/wiki/Histidine_operon_leader

    The Histidine operon leader is an RNA element found in the bacterial histidine operon.At least 6 amino acid operons are known to be regulated by attenuation. [1] In each a leader sequence of 150–200 bp is found upstream of the first gene in the operon.

  6. Tryptophan operon leader - Wikipedia

    en.wikipedia.org/wiki/Tryptophan_operon_leader

    The leader sequence can form two different structures known as the terminator and the anti-terminator, based on the Tryptophan amounts in the cell. The leader also codes for very short peptide sequence that is rich in tryptophan. The terminator structure is recognised as a termination signal for RNA polymerase and the operon is not transcribed.

  7. 6 tips to reduce alcohol use and cancer risk after surgeon ...

    www.aol.com/6-tips-reduce-alcohol-cancer...

    As cancer has been linked to alcohol use, per the surgeon general's new advisory, addiction experts offer helpful tips to cut back on drinking in a safe, healthy way.