Browsing by Author "Thye San Cha"

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    Heterologous expression of the Streptococcus pneumoniae yoeB and pezT toxin genes is lethal in Chlorella vulgaris
    (Algal Research, 2016) Shet, Lee Ng; Jennifer Ann Harikrishna; Fauziah Abu Bakar; ChewChieng Yeo; Thye San Cha
    Chlorella 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.
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    Phosphate-induced changes in fatty acid biosynthesis in Chlorella sp. KS-MA2 strain
    (Journal of Biotechnology, Computational Biology and Bionanotechnology, 2016) Aziz Ahmad; Siti Mariam Osman; Thye San Cha; Sow Hong Loh
    Phosphate is involved in fatty acid biosynthesis in microalgae cells. The influence of phosphate concentrations on polyunsaturated fatty acids’ profile, elongation, and desaturation of fatty acids chains during their biosynthesis still remains unclear.