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Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux
The haloarchaeon Haloferax mediterranei is a potential strain for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) production, yet the production yield and cost are the major obstacles hindering the use of this archaeal strain. Leveraging the endogenous type I-B CRISPR-Cas system in H. mediterran...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8387396/ https://www.ncbi.nlm.nih.gov/pubmed/34433872 http://dx.doi.org/10.1038/s42003-021-02541-z |
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author | Lin, Lin Chen, Junyu Mitra, Ruchira Gao, Quanxiu Cheng, Feiyue Xu, Tong Zuo, Zhenqiang Xiang, Hua Han, Jing |
author_facet | Lin, Lin Chen, Junyu Mitra, Ruchira Gao, Quanxiu Cheng, Feiyue Xu, Tong Zuo, Zhenqiang Xiang, Hua Han, Jing |
author_sort | Lin, Lin |
collection | PubMed |
description | The haloarchaeon Haloferax mediterranei is a potential strain for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) production, yet the production yield and cost are the major obstacles hindering the use of this archaeal strain. Leveraging the endogenous type I-B CRISPR-Cas system in H. mediterranei, we develop a CRISPR-based interference (CRISPRi) approach that allows to regulate the metabolic pathways related to PHBV synthesis, thereby enhancing PHBV production. Our CRISPRi approach can downregulate the gene expression in a range of 25% to 98% depending upon the target region. Importantly, plasmid-mediated CRISPRi downregulation on the citrate synthase genes (citZ and gltA) improves the PHBV accumulation by 76.4% (from 1.78 to 3.14 g/L). When crRNA cassette integrated into chromosome, this further shortens the PHBV fermentation period and enhances PHA productivity by 165%. Our transcriptome analysis shows that repression of citrate synthase genes redirects metabolic flux from the central metabolic pathways to PHBV synthesis pathway. These findings demonstrate that the CRISPRi-based gene regulation is a transformative toolkit for fine-tuning the endogenous metabolic pathways in the archaeal system, which can be applied to not only the biopolymer production but also many other applications. |
format | Online Article Text |
id | pubmed-8387396 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-83873962021-09-22 Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux Lin, Lin Chen, Junyu Mitra, Ruchira Gao, Quanxiu Cheng, Feiyue Xu, Tong Zuo, Zhenqiang Xiang, Hua Han, Jing Commun Biol Article The haloarchaeon Haloferax mediterranei is a potential strain for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) production, yet the production yield and cost are the major obstacles hindering the use of this archaeal strain. Leveraging the endogenous type I-B CRISPR-Cas system in H. mediterranei, we develop a CRISPR-based interference (CRISPRi) approach that allows to regulate the metabolic pathways related to PHBV synthesis, thereby enhancing PHBV production. Our CRISPRi approach can downregulate the gene expression in a range of 25% to 98% depending upon the target region. Importantly, plasmid-mediated CRISPRi downregulation on the citrate synthase genes (citZ and gltA) improves the PHBV accumulation by 76.4% (from 1.78 to 3.14 g/L). When crRNA cassette integrated into chromosome, this further shortens the PHBV fermentation period and enhances PHA productivity by 165%. Our transcriptome analysis shows that repression of citrate synthase genes redirects metabolic flux from the central metabolic pathways to PHBV synthesis pathway. These findings demonstrate that the CRISPRi-based gene regulation is a transformative toolkit for fine-tuning the endogenous metabolic pathways in the archaeal system, which can be applied to not only the biopolymer production but also many other applications. Nature Publishing Group UK 2021-08-25 /pmc/articles/PMC8387396/ /pubmed/34433872 http://dx.doi.org/10.1038/s42003-021-02541-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Lin, Lin Chen, Junyu Mitra, Ruchira Gao, Quanxiu Cheng, Feiyue Xu, Tong Zuo, Zhenqiang Xiang, Hua Han, Jing Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title | Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title_full | Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title_fullStr | Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title_full_unstemmed | Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title_short | Optimising PHBV biopolymer production in haloarchaea via CRISPRi-mediated redirection of carbon flux |
title_sort | optimising phbv biopolymer production in haloarchaea via crispri-mediated redirection of carbon flux |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8387396/ https://www.ncbi.nlm.nih.gov/pubmed/34433872 http://dx.doi.org/10.1038/s42003-021-02541-z |
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