Heterologous expression of the Streptococcus pneumoniae yoeB and pezT toxin genes is lethal in Chlorella vulgaris

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dc.contributor.authorShet, Lee Ng
dc.contributor.authorJennifer Ann Harikrishna
dc.contributor.authorFauziah Abu Bakar
dc.contributor.authorChewChieng Yeo
dc.contributor.authorThye San Cha
dc.date.accessioned2017-04-10T07:27:48Z
dc.date.available2017-04-10T07:27:48Z
dc.date.issued2016
dc.description.abstractChlorella vulgaris is a eukaryotic microalga with potential for the production of biofuels. However, its thick and rigid cell wall is an impediment to cost-effective, large-scale harvesting of biofuels from these cells. Bacterial toxin-antitoxin (TA) systems, comprising of a stable proteic toxin and its labile cognate antitoxin, have no known homologs in eukaryotic cells. Several bacterial TA toxins have been found to be lethal when expressed in eukaryotes such as yeasts, animal and human cell lines. In this study, the functionality of the yoeBSpn and pezT toxin genes from the Gram-positive bacterium Streptococcus pneumoniae in C. vulgaris was investigated using a two-component inducible expression system. The yoeBSpn and pezT toxin genes were each cloned as green fluorescent protein (GFP) fusion constructs and introduced into C. vulgaris by Agrobacterium tumefaciens-mediated co-transformation with recombinant activator and responder vectors. Following induction for the expression of the toxin-GFP fusion transgenes, GFP fluorescence was observed in the transformed C. vulgaris cellswhich also showed signs of cellular damage and lysis. This is the first report of the lethal expression of bacterial TA toxins in eukaryotic microalgae, which can form the basis of a novel method for harvesting of microalgal cellular contents.en_US
dc.identifier.citationVol.19; 21-29 p.en_US
dc.identifier.issn22119264
dc.identifier.urihttp://hdl.handle.net/123456789/5550
dc.language.isoenen_US
dc.publisherAlgal Researchen_US
dc.subjectAgrobacterium tumefaciens-mediated transformationen_US
dc.subjectToxin-antitoxin genesen_US
dc.subjectTwo-component expression systemen_US
dc.subjectXVE inducible systemen_US
dc.subject17-β-Estradiolen_US
dc.subjectMicroalgae-based biofuelen_US
dc.titleHeterologous expression of the Streptococcus pneumoniae yoeB and pezT toxin genes is lethal in Chlorella vulgarisen_US
dc.typeArticleen_US
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