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Related Experiment Videos

GAF domains: cyclic nucleotides come full circle.

James H Hurley1

  • 1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0580, USA. james.hurley@nih.gov

Science'S STKE : Signal Transduction Knowledge Environment
|January 9, 2003
PubMed
Summary

Cyclic nucleotide-binding GAF domains, crucial in cell signaling, are now known to bind both cyclic AMP and cyclic GMP. Structural studies reveal conserved elements enabling recognition of these common signaling molecules.

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Area of Science:

  • Molecular biology
  • Biochemistry
  • Cell signaling

Background:

  • Cyclic nucleotides like cyclic AMP and cyclic GMP are vital signaling molecules across diverse life forms.
  • In higher eukaryotes, conserved machinery processes signals via cyclic AMP and cyclic GMP.
  • The GAF domain is a key cyclic nucleotide recognition module.

Purpose of the Study:

  • To investigate the binding capabilities of the GAF domain beyond its known cyclic GMP binding.
  • To understand the structural basis for GAF domain recognition of cyclic nucleotides.

Main Methods:

  • Structural analysis of cyclic GMP-binding GAF domains.
  • Comparative analysis of conserved elements within GAF domains.

Main Results:

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  • The GAF domain, previously thought to bind only cyclic GMP, also binds cyclic AMP.
  • Structural insights reveal conserved molecular features enabling GAF domains to recognize both cyclic AMP and cyclic GMP.

Conclusions:

  • The GAF domain exhibits broader cyclic nucleotide binding than previously understood.
  • Conserved structural elements are key to the dual recognition of cyclic AMP and cyclic GMP by GAF domains.