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Updated: Apr 20, 2026
19:16
Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy FSM
Published on: August 5, 2009
16.6K
Structural and dynamics aspects of ASC speck assembly.
Ali Can Sahillioglu1, Fidan Sumbul2, Nesrin Ozoren3
1Department of Molecular Biology and Genetics, Apoptosis and Cancer Immunology Laboratory (AKIL), Bogazici University, 34470 Istanbul, Turkey.
Structure (London, England : 1993)
|December 3, 2014
Summary
The inflammasome
Area of Science:
- Immunology
- Structural Biology
- Cell Biology
Background:
- Inflammasome activation leads to ASC speck formation, a platform for caspase-1.
- The ASC speck's formation mechanism (aggregation vs. specific interactions) is unclear.
- ASC speck shares features with aggresomes, complicating its structural understanding.
Purpose of the Study:
- To investigate the structural organization and formation mechanism of the ASC speck.
- To determine if ASC speck formation involves nonspecific aggregation or specific domain interactions.
- To elucidate the roles of PYD and CARD domains in ASC speck assembly.
Main Methods:
- Gaussian network modeling of PYD and CARD domains.
- Molecular dynamics simulations of wild-type and mutated PYD.
- In vitro and in vivo mutational analysis of ASC structure and domains.
Main Results:
- The ASC speck is an organized structure, not a random aggregate.
- Specific interactions of PYD and CARD domains drive ASC speck formation.
- At least two distinct compaction mechanisms are involved in ASC speck assembly.
Conclusions:
- ASC speck formation is a highly regulated process driven by specific protein-protein interactions.
- The structure of the ASC speck is critical for its function as a platform for caspase-1.
- Understanding ASC speck organization provides insights into inflammasome signaling pathways.
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