Cysteine residues in the fourth zinc finger are important for activation of the nitric oxide-inducible transcription factor Fzf1 in the yeast Saccharomyces cerevisiae.
Ryo NasunoNatsuko YoshiokaYuki YoshikawaHiroshi TakagiPublished in: Genes to cells : devoted to molecular & cellular mechanisms (2021)
Nitric oxide (NO) is a ubiquitous signaling molecule in various organisms. In the yeast Saccharomyces cerevisiae, NO functions in both cell protection and cell death, depending on its concentration. Thus, it is important for yeast cells to strictly regulate NO concentration. The transcription factor Fzf1, containing five zinc fingers, is reportedly important for NO homeostasis by regulating the expression of the YHB1 gene, which encodes NO dioxygenase. However, the mechanism by which NO activates Fzf1 is still unclear. In this study, we showed that NO activated Fzf1 specifically at the protein level by RT-qPCR and Western blotting. Our further transcriptional analyses indicated that cysteine residues in the fourth zinc finger (ZF4) are required for the NO-responsive activation of Fzf1. Additionally, the present results suggest that ZF4 is important for the protein stability of Fzf1. From these results, we proposed possible mechanisms underlying Fzf1 activation.
Keyphrases
- saccharomyces cerevisiae
- transcription factor
- nitric oxide
- cell death
- cell cycle arrest
- oxide nanoparticles
- binding protein
- induced apoptosis
- nitric oxide synthase
- hydrogen peroxide
- poor prognosis
- single cell
- stem cells
- gene expression
- cell therapy
- fluorescent probe
- amino acid
- cell proliferation
- bone marrow
- oxidative stress
- cancer therapy
- gram negative
- copy number
- heat shock