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Extracting function from a beta-trefoil folding motif.

Shachi Gosavi1, Paul C Whitford, Patricia A Jennings

  • 1Center for Theoretical Biological Physics and Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0374, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 25, 2008
PubMed
Summary

Interleukin-1 beta (IL-1beta) and Interleukin-1 receptor antagonist (IL-1Ra) share similar structures but differ in function and folding speed. Specific structural regions, like the beta-bulge, influence protein folding and biological activity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding Dynamics

Background:

  • Interleukin-1 beta (IL-1beta) and Interleukin-1 receptor antagonist (IL-1Ra) are structurally similar proteins involved in inflammatory responses.
  • Despite structural similarities, IL-1beta activates signaling pathways, while IL-1Ra inhibits them through competitive binding to the IL-1 receptor.

Purpose of the Study:

  • To investigate the relationship between structural differences, protein folding kinetics, and functional divergence between IL-1beta and IL-1Ra.
  • To identify specific protein regions responsible for differential folding rates and biological activities.

Main Methods:

  • Comparative structural analysis of IL-1beta and IL-1Ra.
  • Computational protein folding simulations.
  • Bioassays and mutational analyses to assess protein function and folding.

Main Results:

  • IL-1Ra exhibits faster folding kinetics compared to IL-1beta.
  • Key structural differences were identified in a beta-bulge of IL-1beta and a loop in IL-1Ra.
  • Mutational studies demonstrated that the IL-1beta beta-bulge confers partial signaling activity to IL-1Ra, and its replacement in IL-1beta accelerates folding.

Conclusions:

  • Functional regions, particularly those involved in activity or inhibition, can act as 'folding traps', slowing down protein folding.
  • Structural variations in loops and beta-bulges significantly impact both protein folding rates and biological functions within the IL-1 protein family.
  • This study presents a systematic approach for mapping functional genomics within protein fold families.