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Molecular Toolkit for Gene Expression Control and Genome Modification in Rhodococcus opacus PD630

Journal Article · · ACS Synthetic Biology
 [1];  [2];  [2];  [2]
  1. Washington Univ., St. Louis, MO (United States); Washington University in St. Louis
  2. Washington Univ., St. Louis, MO (United States)

Rhodococcus opacus PD630 is a non-model, gram-positive bacterium that possesses desirable traits for lignocellulosic biomass conversion. In particular, it has a relatively rapid growth rate, exhibits genetic tractability, produces high quantities of lipids, and can tolerate and consume toxic, lignin-derived aromatic compounds. Despite these unique, industrially relevant characteristics, R. opacus has been underutilized due to a lack of reliable genetic parts and engineering tools. In this work, we developed a molecular toolbox for reliable gene expression control and genome modification in R. opacus. To facilitate predictable gene expression, a constitutive promoter library spanning ~45-fold in output was constructed. To improve the characterization of available plasmids, the copy numbers of four heterologous and nine endogenous plasmids were determined using quantitative PCR. The molecular toolbox was further expanded by screening a previously unreported antibiotic resistance marker (HygR) and constructing a curable plasmid backbone for temporary gene expression (pB264). Furthermore, a system for genome modification was devised, and three neutral integration sites were identified using a novel combination of transcriptomic data, genomic architecture, and growth rate analysis. Finally, the first reported system for targeted, tunable gene repression in Rhodococcus was developed by utilizing CRISPR interference (CRISPRi). Overall, this work greatly expands the ability to manipulate and engineer R. opacus, making it a viable new chassis for bioproduction from renewable feedstocks.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0012705
OSTI ID:
1419636
Journal Information:
ACS Synthetic Biology, Journal Name: ACS Synthetic Biology Journal Issue: 2 Vol. 7; ISSN 2161-5063
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Synthetic Oligonucleotides Inhibit CRISPR-Cpf1-Mediated Genome Editing journal December 2018
Selection of stable reference genes for RT-qPCR in Rhodococcus opacus PD630 journal April 2018
Lipid metabolism of phenol-tolerant Rhodococcus opacus strains for lignin bioconversion journal December 2018
Impact of CRISPR interference on strain development in biotechnology journal January 2020
Biotransformation of lignin: Mechanisms, applications and future work journal October 2019
Genomics of Rhodococcus book January 2019
Antibiotic resistance genes in the Actinobacteria phylum journal June 2019
A biocatalyst for sustainable wax ester production: re-wiring lipid accumulation in Rhodococcus to yield high-value oleochemicals journal January 2019
Development of a genetic toolset for the highly engineerable and metabolically versatile Acinetobacter baylyi ADP1 journal April 2020
Development of Rhodococcus opacus as a chassis for lignin valorization and bioproduction of high-value compounds journal August 2019

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