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In the well-studied model\n                    <jats:italic>Magnetospirillum gryphiswaldense<\/jats:italic>\n                    , their multistep biosynthesis is tightly controlled by\u2009&gt;\u200930 specific genes clustered within a genomic magnetosome island. The lack of versatile genetic tools for strong, tunable, and orthogonal transcriptional control has impeded the analysis, engineering, and transplantation of this complex biosynthetic pathway. In addition, recent studies revealed an intricate transcriptional architecture of magnetosome gene clusters, but its significance has still remained unclear. Here, by using a bioluminescence reporter assay, we identify several novel constitutive promoters and establish the cumate-inducible repressor\/promoter system CymR\/P\n                    <jats:italic>cym<\/jats:italic>\n                    as a robust and tunable regulatory module for rapid, dose-dependent transcriptional control in\n                    <jats:italic>M. gryphiswaldense<\/jats:italic>\n                    . We demonstrate its successful application for genetic tuning of magnetosome biosynthesis and inducible overproduction by controlling expression of a single essential magnetosome gene in a duplicated hybrid magnetosome gene cluster background. Additionally, we show its versatility by creating a hybrid promoter within the essential long\n                    <jats:italic>mamAB<\/jats:italic>\n                    operon, which experimentally confirms the significance of the intragenic P\n                    <jats:italic>(mamH)<\/jats:italic>\n                    promoter for the generation of long polycistronic transcripts. In summary, our data underlines the importance of balanced magnetosome gene expression. We also provide a versatile framework for dynamic transcriptional control and genetic engineering strategies in\n                    <jats:italic>M. gryphiswaldense<\/jats:italic>\n                    and other bacteria.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Graphical abstract<\/jats:bold>\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:table-wrap>\n                      <jats:table>\n                        <jats:tbody>\n                          <jats:tr>\n                            <jats:td align=\"left\" colspan=\"2\">\n                              <jats:bold>Keypoints<\/jats:bold>\n                              \u2022\n                              <jats:italic>Several novel constitutive promoters expand the genetic toolbox of M. gryphiswaldense.<\/jats:italic>\n                              \u2022\n                              <jats:italic>CymR\/Pcym allows strong, controlled and tunable magnetosome gene expression.<\/jats:italic>\n                              \u2022\n                              <jats:italic>A hybrid inducible magnetosome overproducer shows increased stability.<\/jats:italic>\n                            <\/jats:td>\n                          <\/jats:tr>\n                        <\/jats:tbody>\n                      <\/jats:table>\n                    <\/jats:table-wrap>\n                  <\/jats:p>","DOI":"10.1007\/s00253-026-13978-9","type":"journal-article","created":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T15:07:08Z","timestamp":1786201628000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A cumate-inducible promoter system for tuned gene expression and magnetosome overproduction in magnetotactic bacteria"],"prefix":"10.1007","volume":"110","author":[{"given":"Alexandra","family":"Woller","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Kn\u00f6chel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Rheinberger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00fcrgen M.","family":"Plitzko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dirk","family":"Sch\u00fcler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,8]]},"reference":[{"key":"13978_CR1","doi-asserted-by":"publisher","first-page":"1444","DOI":"10.1016\/j.drudis.2020.06.010","volume":"25","author":"E Alphand\u00e9ry","year":"2020","unstructured":"Alphand\u00e9ry E (2020) Applications of magnetotactic bacteria and magnetosome for cancer treatment: a review emphasizing on practical and mechanistic aspects. 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