Cellular and Molecular Life Sciences

, Volume 64, Issue 12, pp 1518-1530

First online:

Monothiol glutaredoxins: a common domain for multiple functions

  • E. HerreroAffiliated withDepartament de Ciències Mèdiques Bàsiques, IRBLLEIDA, Universitat de Lleida Email author 
  • , M. A. de la Torre-RuizAffiliated withDepartament de Ciències Mèdiques Bàsiques, IRBLLEIDA, Universitat de Lleida

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Monothiol glutaredoxins with the CGFS sequence at the active site are widespread among prokaryotes and eukaryotes. Two subclasses exist, those with a single glutaredoxin domain and those with a thioredoxin-like region followed by one or more glutaredoxin domains. Studies in Saccharomyces cerevisiae have demonstrated the role of the Grx5 protein in the biogenesis of iron-sulfur clusters. Grx5 homologues in other eukaryotes could carry out similar functions. Two S. cerevisiae monothiol glutaredoxins with the thioredoxin-like extension, Grx3 and Grx4, are modulators of the transcriptional activator Aft1, which regulates iron uptake in yeast. The human PICOT protein is a Grx3/Grx4 homologue with the same hybrid primary structure that regulates protein kinase C activity and may participate in physiological processes such as control of cardiac function. Therefore, monothiol glutaredoxins share a common basic structural motif and biochemical mechanism of action, while participating in a diversity of cellular functions as protein redox regulators.


Glutaredoxin redox regulation glutathione oxidative stress iron-sulfur cluster transcription regulator signal transduction