Identification, expression pattern, and characterization of mouse glutaredoxin 2 isoforms

Antioxidants & Redox Signaling
Christoph HudemannChristopher Horst Lillig

Abstract

Glutaredoxin 2 (Grx2) is a glutathione-dependent oxidoreductase involved in the maintenance of mitochondrial redox homeostasis. Grx2 was first characterized as mitochondrial protein, but alternative mRNA variants lacking the transit peptide-encoding first exon were demonstrated for human and proposed for mouse. We systematically screened for alternative transcript variants of mouse Grx2. We identified a total of six exons, three constitutive (II, III, and IV), two alternative first exons (exons Ia and Ic), and one single-cassette exon (exon IIIb) located between exons III and IV. Exons Ic and IIIb are not present in the human genome; mice lack human exon Ib. The six exons give rise to five transcript variants that encode three protein isoforms: mitochondrial Grx2a, a cytosolic isoform that is homologous to the cytosolic/nuclear human Grx2c and present in specific cells of many tissues and the testis-specific isoform Grx2d that is unique to mice. Mouse Grx2c can form an iron/sulfur cluster-bridged dimer, is enzymatically active as a monomer, and can donate electrons to ribonucleotide reductase. Testicular cells lack mitochondrial Grx2a but contain cytosolic Grx2. Prominent immunostaining was detected in spermatogonia and spermat...Continue Reading

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