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Related Experiment Videos

Genetic control by a metabolite binding mRNA.

Ali Nahvi1, Narasimhan Sudarsan, Margaret S Ebert

  • 1Department of Molecular Biophysics and Biochemistry, P.O. Box 208114, New Haven, CT 06520, USA.

Chemistry & Biology
|September 27, 2002
PubMed
Summary

Messenger RNAs can actively monitor cellular metabolites. The Escherichia coli btuB mRNA binds coenzyme B12, regulating its own gene expression without proteins.

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Area of Science:

  • Molecular Biology
  • Bacterial Genetics
  • RNA Biology

Background:

  • Messenger RNAs (mRNAs) are traditionally viewed as passive genetic information carriers during translation.
  • Regulatory factors like proteins and small RNAs typically control mRNA activity.
  • The role of mRNA untranslated regions in direct metabolic sensing is less understood.

Purpose of the Study:

  • To investigate the functional role of the 5'-untranslated region (5'-UTR) of Escherichia coli btuB mRNA.
  • To determine if mRNA can directly sense and respond to metabolites.
  • To explore a novel mechanism for metabolic monitoring and genetic control.

Main Methods:

  • Analysis of the Escherichia coli btuB mRNA 5'-UTR sequence.
  • In vitro studies of coenzyme B12 binding to the btuB mRNA.

Related Experiment Videos

  • Assessment of RNA structural changes upon metabolite binding.
  • Investigation of the impact of binding on ribosome binding and translation initiation.

    • Main Results:

    • The 5'-UTR of btuB mRNA directly binds coenzyme B12 without requiring accessory proteins.
    • Coenzyme B12 binding induces a specific structural alteration in the mRNA.
    • This structural change inhibits ribosome binding to the mRNA.
    • Consequently, the synthesis of the BtuB cobalamin transport protein is reduced.

    Conclusions:

    • The btuB mRNA 5'-UTR functions as a metabolite-sensing genetic switch.
    • RNA-metabolite interactions can directly regulate gene expression.
    • This mechanism provides a direct link between metabolite levels and protein synthesis.
    • Metabolic monitoring via RNA-metabolite interactions may be a widespread genetic control strategy.