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Proteins with leucine-rich repeats

B Kobe1, J Deisenhofer

  • 1St Vincent's Institute of Medical Research, Fitzroy, Australia.

Current Opinion in Structural Biology
|June 1, 1995
PubMed
Summary

Leucine-rich repeats are protein motifs crucial for interactions. Their beta-alpha structure, revealed by crystal structures, explains how they bind other proteins like ribonuclease A.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Leucine-rich repeats (LRRs) are common protein motifs.
  • LRRs are implicated in diverse protein-protein interactions.
  • The structural basis of LRR function was previously unclear.

Purpose of the Study:

  • To elucidate the structural basis of leucine-rich repeat function.
  • To understand how LRRs mediate protein-protein interactions.

Main Methods:

  • X-ray crystallography was used to determine protein structures.
  • Analysis of the ribonuclease inhibitor crystal structure.
  • Examination of the ribonuclease A-ribonuclease inhibitor complex structure.

Main Results:

  • Leucine-rich repeats form distinct beta-alpha structural units.
  • The crystal structure reveals the atomic details of LRR-mediated binding.
  • The structure of the ribonuclease A-ribonuclease inhibitor complex explains binding specificity.

Conclusions:

  • Leucine-rich repeats adopt a conserved beta-alpha fold.
  • This structural motif underlies the protein-binding capabilities of LRRs.
  • Structural insights provide a basis for understanding LRR-mediated biological processes.

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