Efficient Cas9-based genome editing of Rhodobacter sphaeroides for metabolic engineering

Ioannis Mougiakos, Enrico Orsi, Mohammad Rifqi Ghiffary, Wilbert Post, Alberto de Maria, Belén Adiego-Perez, Servé W.M. Kengen, Ruud A. Weusthuis, John van der Oost

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

BACKGROUND: Rhodobacter sphaeroides is a metabolically versatile bacterium that serves as a model for analysis of photosynthesis, hydrogen production and terpene biosynthesis. The elimination of by-products formation, such as poly-β-hydroxybutyrate (PHB), has been an important metabolic engineering target for R. sphaeroides. However, the lack of efficient markerless genome editing tools for R. sphaeroides is a bottleneck for fundamental studies and biotechnological exploitation. The Cas9 RNA-guided DNA-endonuclease from the type II CRISPR-Cas system of Streptococcus pyogenes (SpCas9) has been extensively employed for the development of genome engineering tools for prokaryotes and eukaryotes, but not for R. sphaeroides. RESULTS: Here we describe the development of a highly efficient SpCas9-based genomic DNA targeting system for R. sphaeroides, which we combine with plasmid-borne homologous recombination (HR) templates developing a Cas9-based markerless and time-effective genome editing tool. We further employ the tool for knocking-out the uracil phosphoribosyltransferase (upp) gene from the genome of R. sphaeroides, as well as knocking it back in while altering its start codon. These proof-of-principle processes resulted in editing efficiencies of up to 100% for the knock-out yet less than 15% for the knock-in. We subsequently employed the developed genome editing tool for the consecutive deletion of the two predicted acetoacetyl-CoA reductase genes phaB and phbB in the genome of R. sphaeroides. The culturing of the constructed knock-out strains under PHB producing conditions showed that PHB biosynthesis is supported only by PhaB, while the growth of the R. sphaeroides ΔphbB strains under the same conditions is only slightly affected. CONCLUSIONS: In this study, we combine the SpCas9 targeting activity with the native homologous recombination (HR) mechanism of R. sphaeroides for the development of a genome editing tool. We further employ the developed tool for the elucidation of the PHB production pathway of R. sphaeroides. We anticipate that the presented work will accelerate molecular research with R. sphaeroides.

Original languageEnglish
Article number204
Number of pages1
JournalMicrobial Cell Factories
Volume18
Issue number1
DOIs
Publication statusPublished - 25 Nov 2019

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Metabolic engineering
Metabolic Engineering
Rhodobacter sphaeroides
Genes
Hydroxybutyrates
Biosynthesis
uracil phosphoribosyltransferase
Homologous Recombination
Genome
DNA
Clustered Regularly Interspaced Short Palindromic Repeats
CRISPR-Cas Systems
Terpenes
Gene Editing
Photosynthesis
Deoxyribonuclease I
Hydrogen production
RNA
Initiator Codon
Streptococcus pyogenes

Keywords

  • Cas9
  • Genome editing
  • PHB
  • Rhodobacter sphaeroides

Cite this

@article{8d285012a505475c826d5052d5886e46,
title = "Efficient Cas9-based genome editing of Rhodobacter sphaeroides for metabolic engineering",
abstract = "BACKGROUND: Rhodobacter sphaeroides is a metabolically versatile bacterium that serves as a model for analysis of photosynthesis, hydrogen production and terpene biosynthesis. The elimination of by-products formation, such as poly-β-hydroxybutyrate (PHB), has been an important metabolic engineering target for R. sphaeroides. However, the lack of efficient markerless genome editing tools for R. sphaeroides is a bottleneck for fundamental studies and biotechnological exploitation. The Cas9 RNA-guided DNA-endonuclease from the type II CRISPR-Cas system of Streptococcus pyogenes (SpCas9) has been extensively employed for the development of genome engineering tools for prokaryotes and eukaryotes, but not for R. sphaeroides. RESULTS: Here we describe the development of a highly efficient SpCas9-based genomic DNA targeting system for R. sphaeroides, which we combine with plasmid-borne homologous recombination (HR) templates developing a Cas9-based markerless and time-effective genome editing tool. We further employ the tool for knocking-out the uracil phosphoribosyltransferase (upp) gene from the genome of R. sphaeroides, as well as knocking it back in while altering its start codon. These proof-of-principle processes resulted in editing efficiencies of up to 100{\%} for the knock-out yet less than 15{\%} for the knock-in. We subsequently employed the developed genome editing tool for the consecutive deletion of the two predicted acetoacetyl-CoA reductase genes phaB and phbB in the genome of R. sphaeroides. The culturing of the constructed knock-out strains under PHB producing conditions showed that PHB biosynthesis is supported only by PhaB, while the growth of the R. sphaeroides ΔphbB strains under the same conditions is only slightly affected. CONCLUSIONS: In this study, we combine the SpCas9 targeting activity with the native homologous recombination (HR) mechanism of R. sphaeroides for the development of a genome editing tool. We further employ the developed tool for the elucidation of the PHB production pathway of R. sphaeroides. We anticipate that the presented work will accelerate molecular research with R. sphaeroides.",
keywords = "Cas9, Genome editing, PHB, Rhodobacter sphaeroides",
author = "Ioannis Mougiakos and Enrico Orsi and Ghiffary, {Mohammad Rifqi} and Wilbert Post and {de Maria}, Alberto and Bel{\'e}n Adiego-Perez and Kengen, {Serv{\'e} W.M.} and Weusthuis, {Ruud A.} and {van der Oost}, John",
year = "2019",
month = "11",
day = "25",
doi = "10.1186/s12934-019-1255-1",
language = "English",
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Efficient Cas9-based genome editing of Rhodobacter sphaeroides for metabolic engineering. / Mougiakos, Ioannis; Orsi, Enrico; Ghiffary, Mohammad Rifqi; Post, Wilbert; de Maria, Alberto; Adiego-Perez, Belén; Kengen, Servé W.M.; Weusthuis, Ruud A.; van der Oost, John.

In: Microbial Cell Factories, Vol. 18, No. 1, 204, 25.11.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Efficient Cas9-based genome editing of Rhodobacter sphaeroides for metabolic engineering

AU - Mougiakos, Ioannis

AU - Orsi, Enrico

AU - Ghiffary, Mohammad Rifqi

AU - Post, Wilbert

AU - de Maria, Alberto

AU - Adiego-Perez, Belén

AU - Kengen, Servé W.M.

AU - Weusthuis, Ruud A.

AU - van der Oost, John

PY - 2019/11/25

Y1 - 2019/11/25

N2 - BACKGROUND: Rhodobacter sphaeroides is a metabolically versatile bacterium that serves as a model for analysis of photosynthesis, hydrogen production and terpene biosynthesis. The elimination of by-products formation, such as poly-β-hydroxybutyrate (PHB), has been an important metabolic engineering target for R. sphaeroides. However, the lack of efficient markerless genome editing tools for R. sphaeroides is a bottleneck for fundamental studies and biotechnological exploitation. The Cas9 RNA-guided DNA-endonuclease from the type II CRISPR-Cas system of Streptococcus pyogenes (SpCas9) has been extensively employed for the development of genome engineering tools for prokaryotes and eukaryotes, but not for R. sphaeroides. RESULTS: Here we describe the development of a highly efficient SpCas9-based genomic DNA targeting system for R. sphaeroides, which we combine with plasmid-borne homologous recombination (HR) templates developing a Cas9-based markerless and time-effective genome editing tool. We further employ the tool for knocking-out the uracil phosphoribosyltransferase (upp) gene from the genome of R. sphaeroides, as well as knocking it back in while altering its start codon. These proof-of-principle processes resulted in editing efficiencies of up to 100% for the knock-out yet less than 15% for the knock-in. We subsequently employed the developed genome editing tool for the consecutive deletion of the two predicted acetoacetyl-CoA reductase genes phaB and phbB in the genome of R. sphaeroides. The culturing of the constructed knock-out strains under PHB producing conditions showed that PHB biosynthesis is supported only by PhaB, while the growth of the R. sphaeroides ΔphbB strains under the same conditions is only slightly affected. CONCLUSIONS: In this study, we combine the SpCas9 targeting activity with the native homologous recombination (HR) mechanism of R. sphaeroides for the development of a genome editing tool. We further employ the developed tool for the elucidation of the PHB production pathway of R. sphaeroides. We anticipate that the presented work will accelerate molecular research with R. sphaeroides.

AB - BACKGROUND: Rhodobacter sphaeroides is a metabolically versatile bacterium that serves as a model for analysis of photosynthesis, hydrogen production and terpene biosynthesis. The elimination of by-products formation, such as poly-β-hydroxybutyrate (PHB), has been an important metabolic engineering target for R. sphaeroides. However, the lack of efficient markerless genome editing tools for R. sphaeroides is a bottleneck for fundamental studies and biotechnological exploitation. The Cas9 RNA-guided DNA-endonuclease from the type II CRISPR-Cas system of Streptococcus pyogenes (SpCas9) has been extensively employed for the development of genome engineering tools for prokaryotes and eukaryotes, but not for R. sphaeroides. RESULTS: Here we describe the development of a highly efficient SpCas9-based genomic DNA targeting system for R. sphaeroides, which we combine with plasmid-borne homologous recombination (HR) templates developing a Cas9-based markerless and time-effective genome editing tool. We further employ the tool for knocking-out the uracil phosphoribosyltransferase (upp) gene from the genome of R. sphaeroides, as well as knocking it back in while altering its start codon. These proof-of-principle processes resulted in editing efficiencies of up to 100% for the knock-out yet less than 15% for the knock-in. We subsequently employed the developed genome editing tool for the consecutive deletion of the two predicted acetoacetyl-CoA reductase genes phaB and phbB in the genome of R. sphaeroides. The culturing of the constructed knock-out strains under PHB producing conditions showed that PHB biosynthesis is supported only by PhaB, while the growth of the R. sphaeroides ΔphbB strains under the same conditions is only slightly affected. CONCLUSIONS: In this study, we combine the SpCas9 targeting activity with the native homologous recombination (HR) mechanism of R. sphaeroides for the development of a genome editing tool. We further employ the developed tool for the elucidation of the PHB production pathway of R. sphaeroides. We anticipate that the presented work will accelerate molecular research with R. sphaeroides.

KW - Cas9

KW - Genome editing

KW - PHB

KW - Rhodobacter sphaeroides

UR - https://microbialcellfactories.biomedcentral.com/articles/10.1186/s12934-019-1255-1

U2 - 10.1186/s12934-019-1255-1

DO - 10.1186/s12934-019-1255-1

M3 - Article

VL - 18

JO - Microbial Cell Factories

JF - Microbial Cell Factories

SN - 1475-2859

IS - 1

M1 - 204

ER -