The relationship between sulfur metabolism and tolerance of hexavalent chromium in Scenedesmus acutus (Spheropleales): Role of ATP sulfurylase.

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ID: 58779
2019
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Ranked #13 of 42 articles by views in Aquatic toxicology (Amsterdam, Netherlands)

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Abstract
Sulfur availability and the end products of its metabolism, cysteine, glutathione and phytochelatins, play an important role in heavy metal tolerance, chromium included. Sulfate and chromate not only compete for the transporters but also for assimilation enzymes and chromium tolerance in various organisms has been associated to differences in this pathway. We investigated the mechanisms of Cr(VI)-tolerance increase induced by S-starvation focusing on the role of ATP sulfurylase (ATS) in two strains of Scenedesmus acutus with different chromium sensitivity. S-starvation enhances the defence potential by increasing sulfate uptake/assimilation and decreasing chromium uptake, thus suggesting a change in the transport system. We isolated two isoforms of the enzyme, SaATS1 and SaATS2, with different sensitivity to sulfur availability, and analysed them in S-sufficient and S-replete condition both in standard and in chromium supplemented medium. SaATS2 expression is different in the two strains and presumably marks a different sulfur perception/exploitation in the Cr-tolerant. Its induction and silencing are compatible with a role in the transient tolerance increase induced by S-starvation. This enzyme can however hardly be responsible for the large cysteine production of the Cr-tolerant strain after starvation, suggesting that cytosolic rather than chloroplastic cysteine production is differently regulated in the two strains.
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sardella2019theaquatic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sardella, Alessio;Marieschi, Matteo;Mercatali, Isabel;Zanni, Corrado;Gorbi, Gessica;Torelli, Anna;
Journal Aquatic toxicology (Amsterdam, Netherlands)
Year 2019
DOI
S0166-445X(19)30582-X
URL
Keywords
gsh atp sulfurylase cr-tolerance cr-uptake cysteine sulfur starvation

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