{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T13:16:18Z","timestamp":1785417378596,"version":"3.56.0"},"reference-count":67,"publisher":"American Society for Microbiology","issue":"3","license":[{"start":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T00:00:00Z","timestamp":1773878400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T00:00:00Z","timestamp":1773878400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R35GM131762"],"award-info":[{"award-number":["R35GM131762"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000183","name":"Army Research Office","doi-asserted-by":"publisher","award":["W911NF2210105"],"award-info":[{"award-number":["W911NF2210105"]}],"id":[{"id":"10.13039\/100000183","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["J Bacteriol"],"published-print":{"date-parts":[[2026,3,19]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title\/>\n                    <jats:p>\n                      <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                      species are Alphaproteobacteria that commonly inhabit plant-associated and aquatic microbial communities. Although\n                      <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                      is widespread and has long served as a model for the study of bacterial cell biology, our understanding of viruses that infect\n                      <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                      species remains limited. Here, we describe the discovery and characterization of Circe, a freshwater N4-like podophage belonging to the\n                      <jats:italic toggle=\"yes\">Schitoviridae<\/jats:italic>\n                      family that infects\n                      <jats:italic toggle=\"yes\">Caulobacter crescentus<\/jats:italic>\n                      . We isolated two variants, CirceC and CirceH, that differ by a single nucleotide, resulting in an F91I substitution in Gp063, an uncharacterized protein found in diverse bacteriophages and bacteria. While both Circe variants adsorb to\n                      <jats:italic toggle=\"yes\">C. crescentus<\/jats:italic>\n                      with similar efficiency, they produce morphologically distinct plaques and display different infection dynamics. Through forward genetic selection and genome-wide transposon fitness profiling, we identified\n                      <jats:italic toggle=\"yes\">C. crescentus<\/jats:italic>\n                      genes involved in cell envelope assembly, membrane sphingolipid biosynthesis, and envelope polysaccharide biosynthesis that influence susceptibility to Circe infection. Loss-of-function mutations in a predicted nucleoside diphosphate sugar epimerase and multiple genes required for smooth lipopolysaccharide (S-LPS) biosynthesis and export conferred strong resistance to infection. Furthermore, an in-frame deletion mutant defective in S-LPS production exhibited a strong defect in Circe adsorption. These results support a model in which S-LPS functions as a receptor for phage Circe. Our study expands the known repertoire of\n                      <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                      phages and adds to a growing understanding of the role of envelope polysaccharides in bacterial infection by N4-family phages.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>\n                        Viruses that infect bacteria and archaea, known as phages, shape microbial communities through their effects on host survival and gene flow. Yet for many microbes, the phages that infect them and the host structures required for infection remain poorly characterized.\n                        <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                        species are ecologically important Alphaproteobacteria that can produce protein surface structures, such as pili, a flagellum, and an S-layer, which are established phage receptors in this genus. We discovered\n                        <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                        phage Circe and provided evidence that it relies on smooth lipopolysaccharide and other envelope carbohydrates to infect\n                        <jats:italic toggle=\"yes\">Caulobacter crescentus<\/jats:italic>\n                        . This study broadens the understanding of phage\u2013host interactions in\n                        <jats:italic toggle=\"yes\">Caulobacter<\/jats:italic>\n                        and establishes Circe as a useful system for dissecting how phages engage with bacterial cells.\n                      <\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/jb.00488-25","type":"journal-article","created":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T14:42:22Z","timestamp":1772030542000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["An N4-like\n                    <i>Caulobacter<\/i>\n                    phage requires host smooth lipopolysaccharide biosynthesis for 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