Characterizing active transportation mechanisms for free fatty acids and antibiotics in Synechocystis sp. PCC 6803 View Full Text


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Article Info

DATE

2019-12

AUTHORS

Matthew P. A. Bellefleur, Soo-Young Wanda, Roy Curtiss

ABSTRACT

BACKGROUND: Synechocystis sp. PCC 6803 is a photosynthetic bacterium that has been genetically modified to produce industrially relevant chemicals, yet efflux mechanisms have not been well elucidated. These photosynthetic organisms live in environments that are often nutrient limited; therefore, the genome of these organisms encodes far fewer proteins used for efflux of chemicals when compared to members of the Enterobacteriaceae family. Understanding efflux mechanisms can lead to a greater efficiency of chemical production within the cyanobacterial cell. RESULTS: Both sll0180 and slr2131 genes that encode the Sll0180 and Slr2131 proteins, respectively, were removed from Synechocystis sp. PCC 6803 and SD277, a high fatty acid-producing Synechocystis-based strain, to test the hypothesis that Sll0180 and Slr2131 contribute to the efflux of chemicals out of Synechocystis sp. PCC 6803 and SD277. The mutant Synechocystis sp. PCC 6803 and SD277 strains with either sll0180 or slr2131 removed from the chromosome had significantly decreased half maximal inhibitory concentrations to various antibiotics. The free fatty acid (FFA) concentration of the SD277 mutant strains increased intracellularly yet decreased extracellularly indicating that Sll0180 and Slr2131 have a role in FFA efflux. E. coli wild-type gene acrA (a homolog to sll0180) was added on a plasmid to the respective mutant strains lacking the sll0180 gene. Similarly, the E. coli wild-type gene acrB (a homolog to slr2131) was added to the respective mutant strains lacking the slr2131 gene. The tolerance to chloramphenicol of each mutant strain containing the wild-type E. coli gene was restored when compared to the parent stains. The extracellular FFA concentration of SD277 Δslr2131 with E. coli acrB increased significantly compared to both SD277 and SD277 Δslr2131. CONCLUSIONS: Two proteins involved in the transportation of antibiotics and FFAs out of the Synechocystis sp. PCC 6803 cell were identified. In an effort to alleviate costs associated with mechanically or chemically separating the cells from the FFAs, the combination of genome editing of SD277 and the addition of exogenous transport gene increased extracellular concentrations of FFAs. This understanding of active transportation is critical to improving the production efficiency for all industrially relevant chemicals produced in Synechocystis sp. PCC 6803. More... »

PAGES

5

Journal

TITLE

BMC Biotechnology

ISSUE

1

VOLUME

19

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12896-019-0500-3

DOI

http://dx.doi.org/10.1186/s12896-019-0500-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1111321341

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30630457


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    "description": "BACKGROUND: Synechocystis sp. PCC 6803 is a photosynthetic bacterium that has been genetically modified to produce industrially relevant chemicals, yet efflux mechanisms have not been well elucidated. These photosynthetic organisms live in environments that are often nutrient limited; therefore, the genome of these organisms encodes far fewer proteins used for efflux of chemicals when compared to members of the Enterobacteriaceae family. Understanding efflux mechanisms can lead to a greater efficiency of chemical production within the cyanobacterial cell.\nRESULTS: Both sll0180 and slr2131 genes that encode the Sll0180 and Slr2131 proteins, respectively, were removed from Synechocystis sp. PCC 6803 and SD277, a high fatty acid-producing Synechocystis-based strain, to test the hypothesis that Sll0180 and Slr2131 contribute to the efflux of chemicals out of Synechocystis sp. PCC 6803 and SD277. The mutant Synechocystis sp. PCC 6803 and SD277 strains with either sll0180 or slr2131 removed from the chromosome had significantly decreased half maximal inhibitory concentrations to various antibiotics. The free fatty acid (FFA) concentration of the SD277 mutant strains increased intracellularly yet decreased extracellularly indicating that Sll0180 and Slr2131 have a role in FFA efflux. E. coli wild-type gene acrA (a homolog to sll0180) was added on a plasmid to the respective mutant strains lacking the sll0180 gene. Similarly, the E. coli wild-type gene acrB (a homolog to slr2131) was added to the respective mutant strains lacking the slr2131 gene. The tolerance to chloramphenicol of each mutant strain containing the wild-type E. coli gene was restored when compared to the parent stains. The extracellular FFA concentration of SD277 \u0394slr2131 with E. coli acrB increased significantly compared to both SD277 and SD277 \u0394slr2131.\nCONCLUSIONS: Two proteins involved in the transportation of antibiotics and FFAs out of the Synechocystis sp. PCC 6803 cell were identified. In an effort to alleviate costs associated with mechanically or chemically separating the cells from the FFAs, the combination of genome editing of SD277 and the addition of exogenous transport gene increased extracellular concentrations of FFAs. This understanding of active transportation is critical to improving the production efficiency for all industrially relevant chemicals produced in Synechocystis sp. PCC 6803.", 
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Download the RDF metadata as:  json-ld nt turtle xml License info

HOW TO GET THIS DATA PROGRAMMATICALLY:

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curl -H 'Accept: application/ld+json' 'https://scigraph.springernature.com/pub.10.1186/s12896-019-0500-3'

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Turtle is a human-readable linked data format.

curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1186/s12896-019-0500-3'

RDF/XML is a standard XML format for linked data.

curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1186/s12896-019-0500-3'


 

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