Abstract:
:Zinc is a crucial mineral for all organisms as it is an essential cofactor for the proper function of a plethora of proteins and depletion of zinc causes oxidative stress. Glutathione is the major redox buffering agent in the cell and therefore important for mitigation of the adverse effects of oxidative stress. In mammalian cells, zinc deficiency is accompanied by a glutathione depletion. In the yeast Saccharomyces cerevisiae, the opposite effect is observed: under low zinc conditions, an elevated glutathione concentration is found. The main regulator to overcome zinc deficiency is Zap1p. However, we show that Zap1p is not involved in this glutathione accumulation phenotype. Furthermore, we found that in glutathione-accumulating strains also the metal ion-binding phytochelatin-2, which is an oligomer of glutathione, is accumulated. This increased phytochelatin concentration correlates with a lower free zinc level in the vacuole. These results suggest that phytochelatin is important for zinc buffering in S. cerevisiae and thus explains how zinc homeostasis is connected with glutathione metabolism.
journal_name
FEMS Yeast Resjournal_title
FEMS yeast researchauthors
Steiger MG,Patzschke A,Holz C,Lang C,Causon T,Hann S,Mattanovich D,Sauer Mdoi
10.1093/femsyr/fox028subject
Has Abstractpub_date
2017-06-01 00:00:00issue
4eissn
1567-1356issn
1567-1364pii
3821179journal_volume
17pub_type
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