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Dinoflagellates possess unusually large genomes but remarkably few transcription factors, most of which contain a cold shock domain (CSD). In this study, we investigated the transcriptional responses associated with growth stimulation in the symbiotic dinoflagellate Breviolum minutum. Exposure to zinc oxide nanoparticles significantly promoted cell proliferation, and transcriptome analysis identified a CSD protein (CSP) gene, designated B. minutum CSP1 (BmCSP1) as one of the few upregulated genes encoding transcription-related proteins under this growth-promoting condition. Phylogenetic analysis revealed that BmCSP1 belongs to a highly divergent dinoflagellate CSD clade. To examine its biochemical properties, we analyzed the recombinant CSD of BmCSP1 and compared it with Escherichia coli CspA (EcCspA). BmCSP1 bound single-stranded DNA and RNA with apparent affinities similar to those of EcCspA but exhibited stronger apparent binding to double-stranded DNA (dsDNA). Electrophoretic mobility shift assays further revealed a distinctive concentration-dependent dsDNA-binding behavior: at lower concentrations, BmCSP1 formed sharp, discrete protein\u2013DNA complexes, whereas at higher concentrations the electrophoretic behavior of the complexes became increasingly heterogeneous. Comparative analyses using supercoiled, open circular, and linearized plasmid DNA further demonstrated that BmCSP1\u2013dsDNA interactions are strongly influenced by DNA topology. In addition, both BmCSP1\u2013 and EcCspA\u2013dsDNA complexes remained stable after heating to 95\u00b0C, despite the loss of dsDNA-binding activity in the free proteins above 55\u00b0C. These findings identify BmCSP1 as a dinoflagellate CSP with unique topology-dependent dsDNA-binding modes and exceptional complex stability, providing new insights into how a limited repertoire of transcription factors may contribute to genome organization and transcriptional regulation in dinoflagellates.<\/jats:p>","DOI":"10.1093\/pcp\/pcag075","type":"journal-article","created":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T11:47:27Z","timestamp":1780573647000},"page":"1573-1586","source":"Crossref","is-referenced-by-count":0,"title":["Distinct concentration-dependent double-stranded DNA-binding modes of a dinoflagellate cold shock domain protein provide insight into mechanisms of nuclear regulation"],"prefix":"10.1093","volume":"67","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6412-9231","authenticated-orcid":false,"given":"Shizue","family":"Yoshihara","sequence":"first","affiliation":[{"name":"Department of Biology, Graduate school of Science, Osaka Metropolitan University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]},{"name":"Department of Biology, Faculty of Science, Osaka Metropolitan University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]},{"name":"Department of Biology, Graduate school of Science, Osaka Prefecture University , 1-1 Gakune-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yohei","family":"Minakuchi","sequence":"additional","affiliation":[{"name":"Comparative Genomics Laboratory, National Institute of Genetics , 1111 Yata, Mishima, Shizuoka 411-8540 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0728-7548","authenticated-orcid":false,"given":"Atsushi","family":"Toyoda","sequence":"additional","affiliation":[{"name":"Comparative Genomics Laboratory, National Institute of Genetics , 1111 Yata, Mishima, Shizuoka 411-8540 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kota","family":"Higashi","sequence":"additional","affiliation":[{"name":"Department of Biology, Faculty of Science, Osaka Metropolitan University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karin","family":"Fujimura","sequence":"additional","affiliation":[{"name":"Department of Biology, Graduate school of Science, Osaka Prefecture University , 1-1 Gakune-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3028-3203","authenticated-orcid":false,"given":"Jun","family":"Minagawa","sequence":"additional","affiliation":[{"name":"National Institute for Basic Biology , Nishigonaka 38, Myodaiji, Okazaki, Aichi 444-8585 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hayato","family":"Tokumoto","sequence":"additional","affiliation":[{"name":"Department of Biology, Graduate school of Science, Osaka Metropolitan University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]},{"name":"Department of Biology, Faculty of Science, Osaka Metropolitan University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]},{"name":"Department of Biology, Graduate school of Science, Osaka Prefecture University , 1-1 Gakune-cho, Naka-ku, Sakai, Osaka 599-8531 ,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,6,7]]},"reference":[{"key":"2026093004112978400_ref1"},{"key":"2026093004112978400_ref2","doi-asserted-by":"publisher","first-page":"1429","DOI":"10.1046\/j.1365-2958.1999.01284.x","article-title":"Characterization of Escherichia coli CspE, whose product negatively regulates transcription of CspA, the gene for the major cold shock protein","volume":"31","author":"Bae","year":"1999","journal-title":"Mol. 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