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Snapshot of a Deadly Embrace: The Caspase-1-GSDMD Interface

Lieselotte Vande Walle1, Mohamed Lamkanfi1

  • 1Laboratory of Medical Innate Immunity, Department of Internal Medicine and Pediatrics, Ghent University, B-9000 Ghent, Belgium.

Immunity
|July 16, 2020
PubMed

Insights

Inflammasome-activated caspase-1 cleaves gasdermin D (GSDMD), a key step in pyroptosis. Lui et al. reveal the X-ray structure of the caspase-1-GSDMD complex, detailing their interaction sites.

Area of Science:

  • Cellular biology
  • Immunology
  • Structural biology

Background:

  • Pyroptosis is a critical inflammatory cell death pathway.
  • Gasdermin D (GSDMD) is the central pore-forming protein in pyroptosis.
  • Inflammasome activation, particularly by caspase-1, triggers GSDMD cleavage.

Purpose of the Study:

  • To elucidate the structural basis of caspase-1 recognition and cleavage of GSDMD.
  • To understand the molecular mechanisms underlying pyroptosis initiation.

Main Methods:

  • X-ray crystallography was used to determine the structure of the caspase-1-GSDMD complex.
  • Biochemical assays were employed to map interaction interfaces.

Main Results:

  • The X-ray structure reveals the precise binding interfaces between caspase-1 and GSDMD.
  • Key residues involved in GSDMD recognition and proteolytic cleavage by caspase-1 were identified.
  • The structure provides insights into how inflammasome activation leads to GSDMD maturation.

Conclusions:

  • The determined structure provides a molecular blueprint for understanding GSDMD-caspase-1 interactions.
  • This work deepens our understanding of pyroptosis regulation and inflammatory caspase function.
  • The findings may inform therapeutic strategies targeting pyroptosis in inflammatory diseases.

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