Molecular characterization and expression pattern of a novel cadmium resistance gene of tobacco

Fuzhao, Nian; Zhao, Lingyun

doi:10.14393/bj-v31n4a2015-26138

Cited by 1 publication

(1 citation statement)

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“…Several cadmium resistance genes are involved in the efflux of cadmium to affect cadmium homeostasis, resulting in the reduction of intracellular cadmium accumulation (9,17). To identify the cadmium resistance of OLE1, we measured the effect of OLE1 overexpression on intracellular levels of cadmium in yeast by using inductively coupled plasma mass spectrometry (ICP-MS).…”

Section: Resultsmentioning

confidence: 99%

Overexpression of OLE1 Enhances Cytoplasmic Membrane Stability and Confers Resistance to Cadmium in Saccharomyces cerevisiae

Fang

Chen

Wang

et al. 2017

Appl Environ Microbiol

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The heavy metal cadmium is widely used and released into the environment, posing a severe threat to crops and humans. Saccharomyces cerevisiae is one of the most commonly used organisms in the investigation of environmental metal toxicity. We investigated cadmium stress and the adaptive mechanisms of yeast by screening a genome-wide essential gene overexpression library. A candidate gene, OLE1, encodes a delta-9 desaturase and was associated with high anti-cadmiumstress activity. The results demonstrated that the expression of OLE1 was positively correlated with cadmium stress tolerance and induction was independent of Mga2p and Spt23p (important regulatory factors for OLE1). Moreover, in response to cadmium stress, cellular levels of monounsaturated fatty acids were increased. The addition of exogenous unsaturated fatty acids simulated overexpression of OLE1, leading to cadmium resistance. Such regulation of OLE1 in the synthesis of unsaturated fatty acids may serve as a positive feedback mechanism to help cells counter the lipid peroxidation and cytoplasmic membrane damage caused by cadmium. IMPORTANCE A S. cerevisiae gene encoding a delta-9 desaturase, OLE1, was associated with high anti-cadmium-stress activity. The data suggest that the regulation of OLE1 in the synthesis of unsaturated fatty acids may serve as a positive feedback mechanism to help yeast cells counter the lipid peroxidation and cytoplasmic membrane damage caused by cadmium. The discovery of OLE1 involvement in membrane stability may indicate a novel defense strategy against cadmium stress.

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Section: Resultsmentioning

confidence: 99%