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Most bacteria synthesize isoprenoids through either the methylerythritol phosphate (MEP) pathway or the mevalonate (MEV) pathway, while a small subset encodes both pathways, including the pathogen\n                      <jats:italic toggle=\"yes\">Mycobacterium marinum<\/jats:italic>\n                      (Mm). It is unclear whether the MEV pathway is functional in Mm, or why Mm encodes seemingly redundant metabolic pathways. Here, we show that the MEP pathway is essential in Mm, while the MEV pathway is dispensable in culture, with the \u0394MEV mutant having no growth defect in axenic culture but a competitive growth defect compared to WT Mm. We found that the MEV pathway does not play a role in\n                      <jats:italic toggle=\"yes\">ex vivo<\/jats:italic>\n                      or\n                      <jats:italic toggle=\"yes\">in vivo<\/jats:italic>\n                      acute infection but does play a role in survival of peroxide stress. Metabolite profiling revealed that modulation of the MEV pathway causes compensatory changes in the concentration of MEP intermediates DOXP and CDP-ME, suggesting that the MEV pathway is functional and that the pathways interact at the metabolic level. Finally, the MEV pathway is upregulated early in the shift down to hypoxia, suggesting that it may provide metabolic flexibility to this bacterium. Interestingly, we found that our complemented strains, which vary in copy number of the polyprenyl synthetase\n                      <jats:italic toggle=\"yes\">idsB2<\/jats:italic>\n                      , responded differently to peroxide and UV stresses, suggesting a role for this gene as a determinant of downstream prenyl phosphate metabolism. Together, these findings suggest that MEV may serve as an anaplerotic pathway to make isoprenoids under stress conditions.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>\n                        Organisms from all domains of life utilize isoprenoids to carry out thousands of critical and auxiliary cellular processes, including signaling, maintaining membrane integrity, stress response, and host-pathogen interactions. The common precursor of all isoprenoids is synthesized via one of two biosynthetic pathways. Importantly, some bacteria encode both pathways, including\n                        <jats:italic toggle=\"yes\">M. marinum<\/jats:italic>\n                        . We found that only one pathway is essential in\n                        <jats:italic toggle=\"yes\">M. marinum<\/jats:italic>\n                        , while the nonessential pathway may confer metabolic flexibility to help the bacterium better adapt to various environmental conditions. We also found that the polyprenyl synthetase IdsB2 plays an important role in driving such phenotypes. Further, we demonstrate metabolic interplay between both functional pathways. These insights represent the first characterization of isoprenoid biosynthesis in dual pathway-encoding mycobacteria.\n                      <\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/jb.00287-25","type":"journal-article","created":{"date-parts":[[2025,10,30]],"date-time":"2025-10-30T13:23:00Z","timestamp":1761830580000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["The mevalonate pathway of isoprenoid biosynthesis supports metabolic flexibility in\n                    <i>Mycobacterium marinum<\/i>"],"prefix":"10.1128","volume":"207","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8345-9225","authenticated-orcid":true,"given":"Christine M.","family":"Qabar","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01an7q238","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Plant and Microbial Biology, University of 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