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Related Experiment Videos

Fold change in evolution of protein structures.

N V Grishin1

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

Journal of Structural Biology
|September 12, 2001
PubMed
Summary

Protein evolution can lead to distinct structures despite sequence similarity. Understanding these protein fold changes is crucial for homology modeling and protein design.

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Area of Science:

  • Structural biology
  • Evolutionary biology
  • Bioinformatics

Background:

  • Protein spatial structures are generally more evolutionarily conserved than amino acid sequences.
  • Recent advancements have revealed homologous proteins with significantly different structures, challenging traditional views.
  • These proteins exhibit sequence conservation, local structural similarity, and functional congruence, indicating evolutionary links.

Purpose of the Study:

  • To investigate the phenomenon of homologous proteins with distinct evolutionary folds.
  • To identify mechanisms driving structural divergence in evolutionarily related proteins.
  • To explore the implications for homology modeling, protein classification, and protein design.

Main Methods:

  • Comparative analysis of protein sequence and structure data.
  • Identification of evolutionary relationships despite structural variations.
  • Examination of sequence and structural features contributing to fold differences.

Main Results:

  • Documented examples of homologous proteins with globally distinct structures.
  • Identified mechanisms including insertions/deletions/substitutions, circular permutations, and beta-sheet rearrangements.
  • Confirmed significant sequence conservation, local structural resemblance, and functional similarity in these cases.

Conclusions:

  • Evolutionary relationships can exist between proteins with different folds.
  • Structural divergence presents challenges for current homology modeling and classification methods.
  • These findings offer new avenues for experimental protein design and engineering.

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