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. 2022 Jan 6;21:7. doi: 10.1186/s12934-021-01732-x

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Scheme of green light-induced alcohol production in Synechocystis sp. PCC6803 (PCC 6803). a The biosynthetic pathway to produce isobutanol and 3-methyl-1-butanol (3MB) from captured CO₂ via photosynthesis in PCC 6803. The CcaS/CcaR two-component system, which was derived from PCC6803, was applied to regulate the gene expression levels of keto-acid decarboxylase (kdc) and alcohol dehydrogenase (adh), which are required to produce isobutanol and 3MB via the amino acid biosynthesis pathway. b Scheme of regulation of gene expression under the control of the CcaS/CcaR system by red light and green light