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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Modified pyrimidines specifically bind the purine riboswitch.

Sunny D Gilbert1, Sarah J Mediatore, Robert T Batey

  • 1Department of Chemistry and Biochemistry, University of Colorado at Boulder, Campus Box 215, Boulder, Colorado 80309-0215, USA.

Journal of the American Chemical Society
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The adenine-responsive purine riboswitch can also recognize modified pyrimidine compounds. This finding broadens our understanding of RNA-based genetic regulation in bacteria.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Purine riboswitches are genetic elements in Gram-positive bacteria.
  • They regulate mRNA expression in response to guanine or adenine.
  • These elements are found in the 5'-untranslated regions of mRNA.

Purpose of the Study:

  • To investigate if the adenine-responsive purine riboswitch recognizes other types of compounds.
  • To characterize the binding of modified pyrimidines to the adenine-responsive RNA element.

Main Methods:

  • Isothermal titration calorimetry (ITC) was used to study binding thermodynamics.
  • X-ray crystallography was employed to determine the structures of RNA-ligand complexes.

Main Results:

  • The adenine-responsive RNA element specifically recognizes pyrimidine compounds.
  • Recognition occurs for pyrimidines with modifications at the 6- or 5,6-positions.
  • Binding is similar in fashion to that observed for purine compounds.

Conclusions:

  • The specificity of the adenine-responsive purine riboswitch is broader than previously known.
  • This RNA element can act as a sensor for both purine and modified pyrimidine compounds.
  • Findings expand the potential applications of riboswitches in synthetic biology and genetic control.