|Detection of Human, Mouse, and Rat Glutaredoxin 3/GLRX3 by Western Blot. Western blot shows lysates of HepG2 human hepatocellular carcinoma cell line, NIH‑3T3 mouse embryonic fibroblast cell line, and H4‑II‑E‑C3 rat hepatoma cell line. PVDF membrane was probed with 1 µg/mL of Sheep Anti-Human Glutaredoxin 3/GLRX3 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF7560) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for Glutaredoxin 3/GLRX3 at approximately 40 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.|
GLRX3 (Glutaredoxin-3; also PICOT, PKC-theta-interacting protein, and Thioredoxin-like protein 2/TXNL2) is a 37-40 kDa member of the multidomain subgroup, monothiol glutaredoxin group of glutaredoxin/GTX proteins. It has widespread expression, but is not found ubiquitously. Cells known to express cytosolic GLRX3 are principally epithelial in type, and include breast and adrenal epithelium, pancreatic exocrine gland epithelium, and proximal tubule renal epithelium. Cardiac muscle may also expresses GLRX3. The function of GLRX3 is not clear. By inference, it is suggested to be involved in cell proliferation, and has also been associated with both PKC-theta regulation and MLP/muscle LIM protein-mediated cardiac contractility. Human GLRX3 is 335 amino acids (aa) in length. It contains an N-terminal thioredoxin-like domain (aa 2-117) that is followed by two PICOT homology domains (aa 144-236 and 237-335). The thioredoxin domain does not possess a typical disulfide, and it is suggested that this domain does not demonstrate redox activity. The PICOT domains will interact with intracellular proteins. GLRX3 exists as both a monomer and homodimer, with the homodimer incorporating two Fe/S clusters into their PICOT domains. These clusters serve as redox sensors within the cell. Over aa 126-294, human GLRX3 shares 98% aa sequence identity with mouse GLRX3.