| Property | Value | |----------|-------| | Protein Name | Caspase-1 | | Gene | CASP1 | | UniProt ID | P29466 | | Molecular Weight | ~45 kDa (active enzyme) | | Subcellular Localization | Cytoplasm, inflammasome complexes | | Protein Family | Caspase family (inflammatory caspases) | | Tissue Expression | Primarily immune cells; low in healthy brain |
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Overview
Caspase-1 is an inflammatory caspase encoded by the [CASP1](/genes/casp1) gene that plays central roles in the innate immune response and inflammatory cell death (pyroptosis)[@martin2019]. It is synthesized as an inactive zymogen (pro-caspase-1) that is activated by assembly into inflammasome complexes in response to pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs).
Once activated, caspase-1 performs two critical functions: (1) cleaving pro-interleukin-1β (pro-IL-1β) and pro-IL-18 to produce active pro-inflammatory cytokines, and (2) cleaving gasdermin D to initiate pyroptotic cell death. In the brain, caspase-1 activation in microglia and neurons contributes to neuroinflammation and neuronal loss in Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders[@browning2022].
Structure and Activation
Domain Architecture
Caspase-1 contains several structural features[@martin2019]:
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Caspase-1 Protein
<div class="infobox infobox-protein">
| Property | Value | |----------|-------| | Protein Name | Caspase-1 | | Gene | CASP1 | | UniProt ID | P29466 | | Molecular Weight | ~45 kDa (active enzyme) | | Subcellular Localization | Cytoplasm, inflammasome complexes | | Protein Family | Caspase family (inflammatory caspases) | | Tissue Expression | Primarily immune cells; low in healthy brain |
</div>
Overview
Caspase-1 is an inflammatory caspase encoded by the [CASP1](/genes/casp1) gene that plays central roles in the innate immune response and inflammatory cell death (pyroptosis)[@martin2019]. It is synthesized as an inactive zymogen (pro-caspase-1) that is activated by assembly into inflammasome complexes in response to pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs).
Once activated, caspase-1 performs two critical functions: (1) cleaving pro-interleukin-1β (pro-IL-1β) and pro-IL-18 to produce active pro-inflammatory cytokines, and (2) cleaving gasdermin D to initiate pyroptotic cell death. In the brain, caspase-1 activation in microglia and neurons contributes to neuroinflammation and neuronal loss in Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders[@browning2022].
Structure and Activation
Domain Architecture
Caspase-1 contains several structural features[@martin2019]:
N-terminal CARD domain (residues 1-90): Death fold domain for homotypic interactions with adaptor proteins
Prodomain (residues 1-119): Contains the CARD domain
p20 large subunit (residues 120-297): Catalytic domain containing the active site
p10 small subunit (residues 298-404): Completes the catalytic apparatus
Activation Mechanism
Caspase-1 is activated through a multi-step process: