Cited by 52interferon and immune responsesDNA and Nucleic Acid ChemistryRNA Research and Splicing

Analysis of High-Affinity Binding of Protein Kinase R to Double-Stranded RNA

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Husain, Bushra, Mukerji, Ishita, Cole, James L.·2012·Biochemistry

Abstract

Protein kinase R (PKR) is an interferon-induced kinase that plays a pivotal role in the innate immunity response to viral infection. PKR is activated upon binding to double-stranded RNA (dsRNA). Our previous analysis of binding of PKR to dsRNAs ranging from 20 to 40 bp supports a dimerization model for activation in which 30 bp represents the minimal length required to bind two PKR monomers and activate PKR via autophosphorylation. These studies were complicated by the formation of protein-RNA aggregates, particularly at low salt concentrations using longer dsRNAs. Here, we have taken advantage of the enhanced sensitivity afforded using fluorescence-detected analytical ultracentrifugation to reduce the RNA concentrations from micromolar to nanomolar. Under these conditions, we are able to characterize high-affinity binding of PKR to longer dsRNAs in 75 mM NaCl. The PKR binding stoichiometries are increased at lower salt concentrations but remain lower than those previously obtained for the dsRNA binding domain. The dependence of the limiting PKR binding stoichiometries on dsRNA length does not conform to standard models for nonspecific binding and suggests that binding to longer sequences occurs via a different binding mode with a larger site size. Although dimerization plays a key role in the PKR activation mechanism, the ability of shorter dsRNAs to bind two PKR monomers is not sufficient to induce autophosphorylation. We propose that activation of PKR by longer RNAs is correlated with an alternative binding mode in which both of the dsRNA binding motifs contact the RNA, inducing PKR to dimerize via a direct interaction of the kinase domains.

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  • Long double-stranded regions may induce unwanted innate immune responses.

    “In addition, it has been revealed that long double-stranded regions may induce unwanted innate immune responses by previous studies27,54,55.”

    From Algorithm for optimized mRNA design improves stability and immunogenicity (2023) · cites this paper as [54]

    The Abstract identifies PKR as part of the innate immune response and reports that longer dsRNAs can activate it. The Discussion likewise describes activation by longer RNAs, but the paper does not establish that the resulting immune response is unwanted. (LLM, conf=0.84)

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Authors
Husain, B., Mukerji, I., & Cole, J. L.
Affiliations
  • University of Connecticut (US)
  • Wesleyan University (US)
Corresponding author
Cole, James L.
Venue
Biochemistry
Published
2012-10-26
Volume
51
Issue
44
Pages
8764-8770
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W52630640
Cited by
51
References
32
Citations by year
2026: 4 · 2025: 5 · 2024: 5 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 6 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 7 · 2014: 4 · 2013: 1
FWCI
1.68
Type
journal article
Language
en
Open access
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Wesleyan University Digital Collections (Wesleyan University) (submittedVersion)
Funders
National Institute of Allergy and Infectious Diseases (AI 53615, R01AI053615)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
Keywords
PKR, double-stranded RNA, RNA-protein interactions, innate immunity, viral infection, kinase dimerization, autophosphorylation, binding stoichiometry, non-specific binding
MeSH terms
Enzyme Activation, Phosphorylation, Protein Binding, RNA, Double-Stranded, Ultracentrifugation, eIF-2 Kinase, Protein Multimerization

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