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The double-stranded RNA (dsRNA) sensor protein kinase receptor (PKR) pathway plays a critical role in the cell anti-viral response. Whether PKR can restrict the multiplication of the Old World mammarenavirus lymphocytic choriomeningitis virus (LCMV) and the mechanisms by which LCMV may counteract the anti-viral functions of PKR have not yet been investigated. Here we present evidence that LCMV infection results in very limited levels of PKR activation, but LCMV multiplication is enhanced in the absence of PKR. In contrast, infection with a recombinant LCMV with a mutation affecting the 3\u2032\u22125\u2032 exonuclease (ExoN) activity of the viral nucleoprotein resulted in robust PKR activation in the absence of detectable levels of dsRNA, which was associated with severely restricted virus multiplication that was alleviated in the absence of PKR. However, pharmacological inhibition of PKR activation resulted in reduced levels of LCMV multiplication. These findings uncovered a complex role of the PKR pathway in LCMV-infected cells involving both pro- and anti-viral activities.<\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>As with many other viruses, the prototypic Old World mammarenavirus LCMV can interfere with the host cell innate immune response to infection, which includes the dsRNA sensor PKR pathway. A detailed understanding of LCMV-PKR interactions can provide novel insights about mammarenavirus-host cell interactions and facilitate the development of effective anti-viral strategies against human pathogenic mammarenaviruses. In the present work, we present evidence that LCMV multiplication is enhanced in PKR-deficient cells, but pharmacological inhibition of PKR activation unexpectedly resulted in severely restricted propagation of LCMV. Likewise, we document a robust PKR activation in LCMV-infected cells in the absence of detectable levels of dsRNA. Our findings have revealed a complex role of the PKR pathway during LCMV infection and uncovered the activation of PKR as a druggable target for the development of anti-viral drugs against human pathogenic mammarenaviruses.<\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/jvi.01883-23","type":"journal-article","created":{"date-parts":[[2024,2,20]],"date-time":"2024-02-20T09:00:31Z","timestamp":1708419631000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":13,"title":["Activation of protein kinase receptor (PKR) plays a pro-viral role in mammarenavirus-infected cells"],"prefix":"10.1128","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0174-8454","authenticated-orcid":true,"given":"Haydar","family":"Witwit","sequence":"first","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-9142-4483","authenticated-orcid":true,"given":"Roaa","family":"Khafaji","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arul","family":"Salaniwal","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arthur S.","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"},{"name":"Department of Chemistry, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatrice","family":"Cubitt","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nathaniel","family":"Jackson","sequence":"additional","affiliation":[{"name":"Texas Biomedical Research Institute, San Antonio, Texas, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1934-9494","authenticated-orcid":true,"given":"Chengjin","family":"Ye","sequence":"additional","affiliation":[{"name":"Texas Biomedical Research Institute, San Antonio, Texas, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8155-4528","authenticated-orcid":true,"given":"Susan R.","family":"Weiss","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7084-0804","authenticated-orcid":true,"given":"Luis","family":"Martinez-Sobrido","sequence":"additional","affiliation":[{"name":"Texas Biomedical Research Institute, San Antonio, Texas, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8171-8115","authenticated-orcid":true,"given":"Juan Carlos","family":"de la Torre","sequence":"additional","affiliation":[{"name":"Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_3_2_2","volume-title":"Emerging viruses","author":"Radoshitzky SR","year":"2022","unstructured":"Radoshitzky SR, BuchmeierMJ, de la Torre JC. 2022. 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