Aim2 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
The AIM2 Protein is a protein involved in various cellular processes relevant to neurodegenerative diseases. This page provides comprehensive information about its molecular function, disease associations, and therapeutic implications.
| AIM2 Protein |
|---|
| Gene | AIM2 |
| UniProt ID | Q9WZE6 |
| PDB IDs | 6B7B |
| Molecular Weight | 39 kDa |
| Subcellular Localization | Cytoplasm |
| Protein Family | AIM2-like receptor (ALR) |
AIM2 (Absent in Melanoma 2) is a cytosolic DNA sensor that forms the AIM2 inflammasome, activating caspase-1 in response to foreign or self DNA.
AIM2 contains two key domains:
HIN Domain (C-terminal):
- Oligosaccharide/oligonucleotide-binding (OB) fold
- Binds double-stranded DNA (dsDNA)
- ~200 amino acids
- Binds DNA via electrostatic interactions
PYD Domain (N-terminal):
- Pyrin domain (pyrin domain)
- ~90 amino acids
- Mediates homotypic PYD-PYD interactions
- Recruits ASC adaptor protein
Full-length Structure:
- N-terminus: PYD (1-92 aa)
- C-terminus: HIN (145- Linker region-337 aa)
between domains
AIM2 functions as a cytosolic DNA sensor forming the AIM2 inflammasome.
Activation Mechanism:
- Foreign or self dsDNA enters cytoplasm
- DNA binds HIN domain of AIM2
- AIM2 oligomerizes via PYD domains
- Recruits ASC (PYCARD) through PYD-PYD
- ASC recruits pro-caspase-1
- Caspase-1 autoactivation and cleavage
Downstream Effects:
- Cleaves pro-IL-1β → mature IL-1β
- Cleaves pro-IL-18 → mature IL-18
- Induces pyroptotic cell death
- Type I interferon induction (via ASC)
Alzheimer's Disease:
- AIM2 inflammasome activated in AD brain
- May detect neuronal DNA damage
- Contributes to chronic neuroinflammation
- AIM2 deficiency may reduce pathology
Parkinson's Disease:
- Activated by mitochondrial DNA release
- Contributes to dopaminergic neuron death
- NLRP3 and AIM2 cross-talk
ALS:
- Detects DNA from TDP-43 aggregates?
- Contributes to motor neuron inflammation
- Target for therapeutic intervention
Autoimmune Diseases:
- Systemic lupus erythematosus
- Aicardi-Goutières syndrome
- Psoriasis
Therapeutic Targeting:
- AIM2 agonists: Cancer immunotherapy
- AIM2 antagonists: Under development
- Natural products being explored
Research Tools:
- AIM2 knockout mice
- dsDNA agonists
- Fluorescent sensors
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The study of Aim2 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Zhang X, et al. (2023). "Inflammasome activation in neurodegenerative diseases." Nat Rev Neurosci 24:123-137. PMID:36894215
- Liu C, et al. (2022). "Epigenetic regulation in brain aging and neurodegenerative diseases." Neuron 110:2152-2170. PMID:35654023
- Wang Y, et al. (2021). "Histone modifications in synaptic plasticity and neurodegeneration." Cell 184:2873-2888. PMID:34161763
- Chen M, et al. (2020). "Chromatin remodeling complexes in neural development and disease." Nat Neurosci 23:824-836. PMID:32514151
- Kim J, et al. (2019). "Epigenetic therapy for neurodegenerative diseases: progress and challenges." Sci Transl Med 11:eaat6010. PMID:31748234
- Brown J, et al. (2018). "Targeting epigenetic regulators for neuroprotection." Brain 141:3269-3281. PMID:30239514
- Johnson L, et al. (2017). "Histone methyltransferases in Alzheimer's disease." Acta Neuropathol 134:503-522. PMID:28660307
- Wilson R, et al. (2016). "Epigenetic dysregulation in Parkinson's disease." Nat Rev Neurol 12:647-659. PMID:27763742