Structural Homologies in G-Binding Proteins

  • Brian F. C. Clark
  • Michael Jensen
  • Morten Kjeldgaard
  • Søren Thirup
Part of the New Horizons in Therapeutics book series (NHTH)


The common property of G-binding proteins is, by definition, the ability to bind guanine nucleotides. In this review we shall make our task easier by concentrating on the domain or subunits responsible for carrying out this function. This is not, however, intended to preempt the issue: a common function of such a general nature, exercised in so many different biological organisms and biochemical contexts, does not automatically imply a high, or even a detectable, degree of homology among the proteins that proffer it. Indeed, the G-proteins provide a spectrum of degrees of kinship that range from the intimate to the unrecognizable. Satisfyingly, this spectrum correlates largely with similarity of function, at least within the general classes of G-protein. Nevertheless, between these classes it remains a matter for conjecture whether the difference between just-detectable homology and no detectable homology, significant as it may be in the statistical sense, is significant in the subjective sense of “telling us anything about evolution.”


Elongation Factor Structural Homology Euglena Gracilis Parallel Strand Mucor Racemosus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Brian F. C. Clark
    • 1
  • Michael Jensen
    • 1
  • Morten Kjeldgaard
    • 1
  • Søren Thirup
    • 1
  1. 1.Division of Biostructural Chemistry, Department of ChemistryAarhus UniversityAarhus CDenmark

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