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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
10:23

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Published on: May 8, 2015

Specific sequence combinations at parallel and antiparallel helix-helix interfaces.

N Kurochkina1

  • 1Department of Biophysics, School of Theoretical Modeling, P.O. Box 15676, Chevy Chase, MD 20825, USA. info@schtm.org

Journal of Theoretical Biology
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Protein helix orientation relies on specific amino acid interactions. This study reveals sequence patterns and hydrophobic group packing that dictate parallel and antiparallel helix arrangements and their angles.

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Last Updated: Jul 1, 2026

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Identifying Protein-protein Interaction Sites Using Peptide Arrays
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Identifying Protein-protein Interaction Sites Using Peptide Arrays

Published on: November 18, 2014

Area of Science:

  • Protein structure and biophysics
  • Molecular interactions and dynamics

Background:

  • Protein secondary structures, specifically alpha-helices, can assemble into parallel or antiparallel orientations.
  • The interface between helices is crucial for protein stability and function, driven by amino acid side chain interactions.
  • Specific residue positions, such as 'a' and 'd' in leucine zipper nomenclature, are known to form the hydrophobic core and influence packing.

Purpose of the Study:

  • To identify repeating sequence combinations at key positions ('a' and 'd') that characterize parallel and antiparallel helix packing.
  • To compare the layer packing of hydrophobic groups for various combinations of aliphatic amino acids at four critical positions.
  • To investigate the correlation between the spatial arrangement of methyl groups and the interhelical angle in both parallel and antiparallel configurations.

Main Methods:

  • Analysis of known protein structures to identify characteristic sequence patterns at 'a' and 'd' positions for parallel and antiparallel interfaces.
  • Computational modeling and comparison of hydrophobic group packing for different aliphatic amino acid combinations at the four key positions.
  • Correlation analysis between the precise positioning of methyl groups (representing hydrophobic side chains) and the measured interhelical angles.

Main Results:

  • Identified distinct repeating sequence motifs at 'a' and 'd' positions associated with both parallel and antiparallel helix packing.
  • Demonstrated variations in hydrophobic layer packing based on the specific combinations of aliphatic amino acids.
  • Found a significant correlation between the specific orientation of methyl groups and the interhelical angle for both parallel and antiparallel helix types.

Conclusions:

  • The orientation and angle of protein helices are predictable based on specific amino acid sequence patterns and hydrophobic interactions.
  • Understanding these residue-level interactions provides insights into the principles governing protein quaternary structure formation.
  • This work contributes to the broader understanding of protein folding and design by elucidating key determinants of helix assembly.