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Related Experiment Videos

Classification of AAA+ proteins.

Moritz Ammelburg1, Tancred Frickey, Andrei N Lupas

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

Journal of Structural Biology
|July 11, 2006
PubMed
Summary
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This study identifies a key alpha-helical C-domain characteristic of AAA+ proteins, clarifying their superfamily classification. It reclassifies RFL1 homologs as AAA+ proteins while excluding SF3 helicases.

Area of Science:

  • Biochemistry and Molecular Biology
  • Structural Biology
  • Genomics

Background:

  • AAA+ proteins are a large superfamily of P-loop ATPases crucial for macromolecular unfolding and disaggregation.
  • Previous classifications based on sequence similarity and morphology presented discrepancies regarding specific protein clades.

Purpose of the Study:

  • To establish a definitive characteristic for AAA+ protein identification within their superfamily.
  • To re-evaluate and refine the classification of various clades, including RFL1 and SF3 helicases, based on the identified characteristic.

Main Methods:

  • Comparative sequence analysis to generate protein cluster maps.
  • Identification and characterization of conserved structural domains, specifically the C-terminal alpha-helical domain.

Related Experiment Videos

  • Re-evaluation of existing protein classifications within the AAA+ superfamily.

    • Main Results:

    • The presence of an alpha-helical domain C-terminal to the ATPase domain (C-domain) is established as a hallmark of AAA+ proteins.
    • RFL1 and its homologs (APAF-1, CED-4, MalT, AfsR) are confirmed as AAA+ proteins.
    • Viral SF3 helicases are determined not to be AAA+ proteins.
    • A refined cluster map positions RuvB centrally and clarifies inter-clade relationships.

    Conclusions:

    • The C-domain serves as a robust marker for AAA+ protein identification, enabling a more accurate superfamily classification.
    • The revised classification resolves previous ambiguities concerning RFL1 and SF3 helicases, improving our understanding of AAA+ protein evolution and function.