Core Mechanisms of PKR in Antiviral Immunity
Core Mechanisms of PKR in Antiviral Immunity
Literature Information
This review synthesizes key findings from structural, evolutionary, and functional studies of double-stranded RNA-dependent protein kinase (PKR, encoded by EIF2AK2), a central regulator of innate antiviral defense, stress signaling, and inflammatory responses.
Research Background
PKR is a core kinase in the eukaryotic initiation factor 2α (eIF2α) kinase family, historically referred to as p68 kinase. It is constitutively expressed and further induced by interferons, enabling rapid detection of viral dsRNA and initiation of antiviral cascades. Dysregulation of PKR is linked to viral pathogenesis, cellular stress disorders, and tumor progression.
Research Approach
This analysis integrates structural biology, comparative genomics, and cell signaling data to define PKR’s domain architecture, activation dynamics, species-specific evolution, and downstream effector pathways. Emphasis is placed on molecular events driving dimerization, autophosphorylation, and eIF2α-mediated translational control.
Key Research Outcomes
- Structural & Regulatory Features
PKR consists of an N-terminal double-stranded RNA-binding region and a C-terminal kinase domain. Inactive PKR exists as a cytoplasmic monomer; upon viral dsRNA sensing, it forms active dimers that drive trans-autophosphorylation.
- Activation Cascade
Viral dsRNA binding triggers conformational shifts, dimerization, and kinase activation. Activated PKR phosphorylates eIF2α, globally suppressing protein synthesis to restrict viral replication while promoting stress-response gene expression.
- Evolutionary Divergence
Mammalian PKR typically contains two dsRNA-binding motifs, while fish PKR shows structural plasticity with 1–3 motifs. Some fish species express Pkz, a paralogous gene likely arising from ancestral duplication, suggesting aquatic niche adaptation.
- Integrated Stress Response (ISR) Regulation
PKR coordinates antiviral immunity via translational repression, apoptosis modulation, and pro-inflammatory cytokine induction, acting as a signaling hub in cellular defense.
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