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Structural drift: a possible path to protein fold change.

S Sri Krishna1, Nick V Grishin

  • 1Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, 5323, Harry Hines Blvd, Dallas, TX 75390-9050, USA.

Bioinformatics (Oxford, England)
|December 18, 2004
PubMed
Summary
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Protein structures evolve over time. Researchers identified a mechanism called structural drift, explaining how protein folds change by analyzing a formate dehydrogenase domain.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Evolutionary Biology

Background:

  • Protein structures are not static and undergo changes.
  • Evolutionary processes drive alterations in protein sequences and structures.
  • Understanding these changes is crucial for deciphering protein function and evolution.

Purpose of the Study:

  • To investigate the mechanism of protein fold changes over time.
  • To analyze the evolutionary relationship between ferredoxin and formate dehydrogenase domains.
  • To illustrate how structural elements can be rearranged within protein folds.

Main Methods:

  • Analysis of a formate dehydrogenase domain.
  • Comparative study with ferredoxin evolutionary relatives.
  • Identification of structural elements characteristic of the beta-Grasp fold.

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Main Results:

  • The formate dehydrogenase domain exhibits characteristics of both ferredoxin and beta-Grasp folds.
  • A mechanism termed 'structural drift' was identified.
  • Structural drift explains how protein folds can change through alterations in their structural elements.

Conclusions:

  • Protein structure changes are a consequence of mutating sequences.
  • Structural drift is a viable mechanism for protein fold evolution.
  • The studied formate dehydrogenase domain provides a model for understanding structural drift.