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Related Experiment Videos

A seven-helix coiled coil.

Jie Liu1, Qi Zheng, Yiqun Deng

  • 1Department of Biochemistry, Weill Medical College of Cornell University, New York, NY 10021, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 13, 2006
PubMed
Summary
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Researchers modified coiled-coil proteins by replacing specific residues with alanine. This unexpectedly formed a stable seven-protein structure, revealing novel coiled-coil assembly principles and protein packing diversity.

Area of Science:

  • Protein Biochemistry
  • Structural Biology
  • Molecular Self-Assembly

Background:

  • Coiled-coil proteins feature a seven-residue repeat (a-g).
  • Hydrophobic residues at 'a' and 'd' positions typically mediate helix interactions.
  • Hydrophilic residues at 'e' and 'g' positions flank the hydrophobic core.

Purpose of the Study:

  • To investigate how core amino acid properties influence coiled-coil architecture.
  • To examine the effect of replacing 'e' and 'g' residues with nonpolar alanine in the GCN4 leucine zipper.

Main Methods:

  • Site-directed mutagenesis of the GCN4 leucine zipper.
  • Characterization of the mutant protein in aqueous solution.
  • High-resolution (1.25 Å) crystal structure determination of the resulting complex.

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Main Results:

  • Alanine substitution at 'e' and 'g' positions unexpectedly yielded a stable alpha-helical heptamer.
  • Crystal structure revealed a parallel seven-stranded coiled coil with a central tubular channel.
  • An unusual heptad register shift and novel interleaved hydrophobic helical screw geometry were observed.
  • Asparagine residues at 'a' positions were crucial for heptamer stability via buried interhelix hydrogen bonds.

Conclusions:

  • Heptad repeats with four hydrophobic positions can drive the formation of complex, higher-order coiled-coil structures.
  • This study expands the understanding of coiled-coil assembly and the diversity of alpha-helix packing.
  • The findings highlight the critical role of specific residue interactions in dictating protein quaternary structure.