{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T00:06:13Z","timestamp":1785542773822,"version":"3.56.0"},"reference-count":49,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,12,10]],"date-time":"2021-12-10T00:00:00Z","timestamp":1639094400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biology"],"abstract":"<jats:p>Discharge of recalcitrant azo dyes to the environment poses a serious threat to environmental health. However certain microorganisms in nature have developed their survival strategies by degrading these toxic dyes. Cyanobacteria are one such prokaryotic, photosynthetic group of microorganisms that degrade various xenobiotic compounds, due to their capability to produce various reactive oxygen species (ROS), and particularly the hydrogen peroxide (H2O2) when released in their milieu. The accumulation of H2O2 is the result of the dismutation of superoxide radicals by the enzyme superoxide dismutase (SOD). In this study, we have genetically modified the cyanobacterium Synechococcus\u00a0elongatus PCC 7942 by integrating Cu\/Zn SOD gene (sodC) from Synechococcus sp. PCC 9311 to its neutral site through homologous recombination. The overexpression of sodC in the derivative strain was driven using a strong constitutive promoter of the psbA gene. The derivative strain resulted in constitutive production of sodC, which was induced further during dye-treated growth. The genetically engineered Synechococcus\u00a0elongatus PCC 7942 (MS-sodC+) over-accumulated H2O2 during azo dye treatment with a higher dye removal rate than the wild-type strain (WS-sodC\u2212). Therefore, enhanced H2O2 accumulation through SODs overexpression in cyanobacteria may serve as a valuable bioremediation tool.<\/jats:p>","DOI":"10.3390\/biology10121313","type":"journal-article","created":{"date-parts":[[2021,12,10]],"date-time":"2021-12-10T08:17:58Z","timestamp":1639124278000},"page":"1313","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Overexpression of Cu\/Zn Superoxide Dismutase (Cu\/Zn SOD) in Synechococcus\u00a0elongatus PCC 7942 for Enhanced Azo Dye Removal through Hydrogen Peroxide Accumulation"],"prefix":"10.3390","volume":"10","author":[{"given":"ShylajaNaciyar","family":"Mohandass","sequence":"first","affiliation":[{"name":"Department of Marine Biotechnology, National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mangalalakshmi","family":"Ragavan","sequence":"additional","affiliation":[{"name":"Department of Marine Biotechnology, National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dineshbabu","family":"Gnanasekaran","sequence":"additional","affiliation":[{"name":"Department of Marine Biotechnology, National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uma","family":"Lakshmanan","sequence":"additional","affiliation":[{"name":"Department of Marine Biotechnology, National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prabaharan","family":"Dharmar","sequence":"additional","affiliation":[{"name":"Department of Marine Biotechnology, National Facility for Marine Cyanobacteria (Sponsored by DBT, Govt. of India), School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sushanta Kumar","family":"Saha","sequence":"additional","affiliation":[{"name":"Shannon Applied Biotechnology Centre, Technological University of Shannon, Moylish Park, V94 E8YF Limerick, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1016\/j.bjm.2016.09.012","article-title":"Degradation of textile dyes by cyanobacteria","volume":"48","author":"Dellamatrice","year":"2017","journal-title":"Braz. 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