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Related Experiment Videos

Spatial profiling of protein hydrophobicity: native vs. decoy structures.

Ruhong Zhou1, B David Silverman, Ajay K Royyuru

  • 1IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA. ruhongz@us.ibm.com

Proteins
|August 12, 2003
PubMed
Summary

Researchers discovered a "hydrophobic ratio" in protein structures, a quasi-invariant value of approximately 0.7. This finding aids in distinguishing native proteins from decoys, complementing existing computational methods.

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Area of Science:

  • Structural Biology
  • Computational Biology
  • Biophysics

Background:

  • Soluble globular proteins exhibit structural characteristics that can be quantified.
  • The hydrophobic moment is a key feature in protein structure analysis.

Purpose of the Study:

  • To investigate the hydrophobic ratio as a quasi-invariant in protein structures.
  • To develop a new hydrophobic score for discriminating native proteins from decoys.

Main Methods:

  • Hydrophobic profiling of 5,387 non-redundant globular protein domains from the Protein Data Bank.
  • Calculation of the hydrophobic ratio (zero-order and second-order hydrophobic moments).
  • Definition and testing of a novel hydrophobic score on established decoy sets (Holm and Sander, Park and Levitt, Baker).

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Main Results:

  • A consistent hydrophobic ratio of 0.71 +/- 0.08 was observed across a large dataset of protein domains.
  • The newly defined hydrophobic score demonstrated utility in differentiating native-like protein structures from decoys.
  • Hydrophobic moment profiling provides valuable insights, even for smaller protein structures.

Conclusions:

  • The hydrophobic ratio is a significant quasi-invariant in globular protein structures.
  • Hydrophobic profiling and scoring offer a complementary approach to force field calculations for protein structure assessment.
  • This method enhances the ability to identify correct protein folds among computational decoys.