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Related Experiment Videos

The GTP binding motif: variations on a theme

M Kjeldgaard1, J Nyborg, B F Clark

  • 1Institute of Molecular and Structural Biology, Aarhus University, Denmark.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|October 1, 1996
PubMed
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Guanine nucleotide-binding proteins (G-proteins) share a common structural core for nucleotide binding. Subtle sequence variations within this core influence G-protein structure and function across diverse biological roles.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Guanine nucleotide-binding proteins (G-proteins) are crucial regulators of cellular processes, including proliferation, signal transduction, protein synthesis, and targeting.
  • G-protein activity is modulated by their binding state, being active when bound to GTP and inactive when bound to GDP.
  • The structural basis of nucleotide binding in G-proteins has been elucidated through X-ray crystallography, starting with the elongation factor EF-Tu.

Purpose of the Study:

  • To review the conserved structural motif for GDP/GTP binding across various G-proteins.
  • To highlight how subtle sequence differences in the common structural core correlate with functional diversity.
  • To examine recently reported structures of G-protein complexes with their substrates.

Main Methods:

Related Experiment Videos

  • Comparative structural analysis of G-protein nucleotide-binding domains.
  • Review of published X-ray crystallographic data for various G-protein families.
  • Examination of consensus sequence elements involved in nucleotide binding.

Main Results:

  • A common structural core for nucleotide binding is present in all analyzed G-proteins.
  • Consensus sequence elements within the core are critical for nucleotide interaction.
  • Subtle variations in these sequences are linked to distinct functional properties of different G-proteins.
  • Structural data on Ras superfamily, ARF, EF-Tu, EF-G, and heterotrimeric G-proteins reveal conserved and divergent features.

Conclusions:

  • The conserved structural motif for GDP/GTP binding provides a fundamental framework for G-protein function.
  • Understanding structural variations within this motif is key to deciphering the diverse roles of G-proteins.
  • Recent structural studies of G-protein complexes offer insights into their substrate interactions and regulatory mechanisms.