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Related Experiment Videos

Phylogenetic analysis of AAA proteins.

Tancred Frickey1, Andrei N Lupas

  • 1Department of Protein Evolution, Max-Planck-Institute for Developmental Biology, Spemannstr. 35, Tübingen D-72076, Germany.

Journal of Structural Biology
|March 24, 2004
PubMed
Summary

AAA ATPases are crucial protein machines. Cluster analysis revealed a sixth major clade (BCS1 homologues) and independent evolution of dual-domain ATPases, refining the AAA+ superfamily classification.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Phylogenetics

Background:

  • AAA ATPases are a large protein family within the AAA+ superfamily, known for unfolding macromolecules.
  • Previous phylogenetic analyses lacked consistency in defining AAA family boundaries.
  • Five major clades of AAA domains were previously suggested.

Purpose of the Study:

  • To unambiguously delineate the AAA sequence group within the AAA+ superfamily using cluster analysis.
  • To refine the classification and understanding of AAA ATPase evolution.
  • To investigate the evolutionary relationships and domain structures within the AAA+ superfamily.

Main Methods:

  • Phylogenetic analysis of AAA sequences.
  • Cluster analysis to delineate AAA sequence groups.
  • Analysis of AAA N-domains for phylogenetic support.

Main Results:

  • A sixth major AAA clade, including BCS1 homologues, was identified.
  • Several deep branches of hypothetical proteins were discovered.
  • Analysis supported most phylogenetic branches but revealed deep splits and unexpected similarities.
  • Degenerate D1 domains in plant MSP1 and hypothetical proteins (YC46) suggest independent evolution of dual-domain ATPases.

Conclusions:

  • Cluster analysis provides a robust method for AAA family delineation.
  • The discovery of a sixth clade and independent evolution events refines AAA+ superfamily classification.
  • AAA N-domain analysis offers complementary phylogenetic insights and reveals convergent evolution patterns.

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