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A phylogenetic and functional overview of inflammatory caspases and caspase-1-related CARD-only proteins

K Kersse1, T Vanden Berghe, M Lamkanfi

  • 1Department for Molecular Biomedical Research, VIB, Ghent, Belgium.

Biochemical Society Transactions
|November 23, 2007
PubMed

Insights

Caspase 1, an inflammatory caspase, processes key cytokines like IL-1beta. Its evolutionary analysis reveals insights into CARD-only decoy proteins and their roles in inflammasome and NF-kappaB activation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Caspase 1 is a key protease in inflammatory cytokine maturation, including interleukin-1beta (IL-1beta) and IL-18.
  • It belongs to the inflammatory caspase group, sharing features with caspases 4, 5, 11, and 12.
  • Caspase 1 possesses a CARD domain crucial for inflammasome assembly and NF-kappaB activation.

Purpose of the Study:

  • To investigate the evolutionary aspects of the inflammatory caspase locus across species.
  • To explore the functional roles of caspase-1-related CARD-only decoy proteins.
  • To understand their relationship with IL-1beta maturation and NF-kappaB activation.

Main Methods:

  • Phylogenetic analysis of the inflammatory caspase locus.
  • Comparative genomics across human, chimpanzee, Rhesus monkey, mouse, and rat.
  • Functional characterization of CARD-only proteins.

Main Results:

  • Evolutionary conservation and variation of the inflammatory caspase locus were identified.
  • Caspase-1-related CARD-only proteins (COP, INCA, ICEBERG) were characterized.
  • These decoy proteins influence caspase-1-mediated IL-1beta maturation and NF-kappaB signaling.

Conclusions:

  • The evolutionary trajectory of inflammatory caspases provides context for their function.
  • CARD-only proteins represent important regulators of inflammatory pathways.
  • Understanding these interactions is vital for inflammatory disease research.

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