Overview
Rat Glutaredoxin (Grx) is a small, ubiquitous redox protein belonging to the thioredoxin superfamily. It plays a critical role in maintaining cellular redox homeostasis by catalyzing the reduction of disulfide bonds in target proteins, often using glutathione as a cofactor. Glutaredoxins are widely studied in models of oxidative stress, neurodegenerative diseases, and signal transduction pathways. In biochemical research, rat-derived glutaredoxin is frequently used due to its structural and functional homology with human isoforms. It is available in recombinant forms for experimental consistency, often expressed in E. coli systems with high purity.
Physical and Chemical Properties
Rat Glutaredoxin typically exhibits a molecular weight of ~12 kDa, though this may vary slightly between isoforms (e.g., Grx1, Grx2). The protein is stable in neutral pH buffers and retains activity in solutions containing reducing agents like DTT or β-mercaptoethanol. Its redox activity is dependent on a conserved CXXC active-site motif. Spectrophotometric assays (e.g., NADPH-coupled assays) are commonly employed to measure its enzymatic activity. The protein is sensitive to prolonged exposure to oxidizing conditions, which may irreversibly inactivate it. Lyophilized formulations are stable for years at -20°C, while solutions require storage at -80°C to prevent degradation.
Main Applications
Rat Glutaredoxin is primarily utilized in biochemical and medical research to investigate redox signaling pathways. It serves as a tool to study oxidative stress responses in cellular models, particularly in neuroscience and cardiology. Researchers also employ it to regenerate oxidized enzymes in vitro or to maintain reduced states of target proteins. In drug discovery, Grx is used to screen compounds that modulate redox balance, potentially relevant for treating diseases like Parkinson’s or diabetes. Its role in iron-sulfur cluster assembly further expands its utility in metalloprotein studies.
Safety and Storage
While Rat Glutaredoxin is not classified as hazardous, standard laboratory precautions (gloves, goggles) are recommended to avoid contamination. Spills should be cleaned with dilute disinfectants, and waste must be disposed of following institutional guidelines for biological materials. For long-term stability, lyophilized protein should be stored at -20°C in a desiccated environment. Reconstituted solutions are aliquoted to minimize freeze-thaw cycles and stored at -80°C. Avoid exposure to strong oxidizers or repeated temperature fluctuations, which can denature the protein.
B2B Procurement Guide
When procuring Rat Glutaredoxin, prioritize suppliers with certified quality controls (e.g., ISO 9001). Key specifications include ≥95% purity (verified by SDS-PAGE or HPLC), endotoxin levels (<1 EU/μg), and functional activity data (e.g., units/mg). Request batch-specific certificates of analysis. Bulk purchases (e.g., >10 mg) may offer cost savings, but validate scalability with a trial batch first. Consider recombinant variants with tags (e.g., His-tag) for easier purification if downstream applications require it. Lead times vary; specialty isoforms may require 4–6 weeks for custom expression.
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