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The KH module has an alpha beta fold

M A Castiglone Morelli1, G Stier, T Gibson

  • 1EMBL, Heidelberg, Germany.

FEBS Letters
|January 23, 1995
PubMed
Summary
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Researchers used NMR spectroscopy to determine the secondary structure of a KH domain from vigilin. The structure revealed a three-stranded beta sheet and two helical regions, offering insights into RNA-associated proteins like FMR1.

Area of Science:

  • Structural Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The KH (K homology) domain is a conserved RNA-binding motif found in various proteins.
  • Proteins containing KH domains, such as vigilin and FMR1, are involved in important cellular processes, including fragile X syndrome.

Purpose of the Study:

  • To elucidate the solution secondary structure of a specific KH domain (vigilin repeat 5).
  • To provide structural insights into the KH domain family and its role in RNA-associated proteins.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
  • Uniform 15N-labeling facilitated complete resonance assignments.
  • Homo-nuclear 2D 1H NMR and 3D 15N-correlated 1H NMR experiments were performed.
  • Analysis of NOE patterns, chemical shifts, and solvent exposure determined secondary structure.

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Main Results:

  • The KH domain (vigilin repeat 5) exhibits a secondary structure comprising an antiparallel three-stranded beta sheet.
  • Two helical regions connect the beta strands.
  • A C-terminal helix may further stabilize the domain, a feature common in the KH family.

Conclusions:

  • The determined secondary structure provides a detailed model for KH domains in solution.
  • This structural information contributes to understanding the function of RNA-binding proteins and their implications in diseases like fragile X syndrome.