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Related Experiment Videos

Allosteric determinants in guanine nucleotide-binding proteins.

Mark E Hatley1, Steve W Lockless, Scott K Gibson

  • 1Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9050, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 19, 2003
PubMed
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Researchers identified the allosteric core of G proteins using statistical coupling analysis (SCA). Mutations in this core altered protein interactions, confirming a nucleotide-dependent switching mechanism essential for G protein function.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • G proteins are crucial signaling molecules with nucleotide-dependent switches.
  • Understanding their allosteric core is key to deciphering signal specificity.

Purpose of the Study:

  • To identify the allosteric core of G proteins using statistical coupling analysis (SCA).
  • To investigate how mutations in this core affect G protein interactions and nucleotide-dependent switching.

Main Methods:

  • Sequence-based statistical coupling analysis (SCA) to identify residues in the allosteric core.
  • Site-directed mutagenesis of identified residues in the Gs alpha protein.
  • Testing interactions of mutant proteins with adenylyl cyclase and G protein beta gamma subunit.

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Main Results:

  • Identified a network of 38 residues comprising the allosteric core.
  • Mutations in these residues altered the affinities for adenylyl cyclase and G beta gamma subunit in a reciprocal manner.
  • Observed results were consistent with a two-state allosteric model.

Conclusions:

  • The identified residue network represents a core allosteric mechanism for nucleotide-dependent switching in G proteins.
  • This core mechanism underlies the specific functions of different G protein family members.