Overview
Thyroxine-Binding Globulin (TBG) is a liver-produced glycoprotein that serves as the primary carrier of thyroid hormones (T3 and T4) in human blood. It accounts for about 70% of bound thyroid hormones, playing a critical role in maintaining hormone stability and regulating their bioavailability. TBG's concentration is influenced by genetic factors, pregnancy, and certain medications. Clinically, abnormal TBG levels can indicate thyroid disorders or liver dysfunction, making it a key biomarker in endocrine diagnostics.
Physical and Chemical Properties
TBG has a molecular weight of approximately 54 kDa and consists of a single polypeptide chain with carbohydrate side chains. Its structure includes a high-affinity binding site for thyroid hormones, with a Ka of ~1 × 10^10 M−1 for T4. The protein is stable at physiological pH but susceptible to denaturation at extreme temperatures or pH levels. In diagnostic applications, TBG's immunoreactivity is preserved when stored at 2–8°C with protease inhibitors.
Main Applications
In clinical laboratories, TBG is primarily used in thyroid function tests (TFTs) to differentiate between true thyroid disorders and TBG-related anomalies. It's also a component of immunoassay calibration kits. Research applications include studies on hormone transport mechanisms and drug-protein interactions. Some specialized assays use recombinant TBG to standardize free thyroid hormone measurements.
Safety and Storage
Purified TBG poses minimal biological risk but should be handled with standard biosafety precautions. Long-term storage requires aliquoting at –20°C or below to prevent activity loss. For diagnostic reagents containing TBG, manufacturers typically recommend avoiding repeated freeze-thaw cycles and protecting from light. Quality control should include testing for endotoxin contamination (<0.1 EU/μg).
B2B Procurement Guide
When sourcing TBG for clinical or research use, prioritize suppliers with ISO 13485 certification for diagnostic materials. Key specifications include: ≥95% purity (SDS-PAGE), low endotoxin levels, and documented binding capacity. Bulk purchasers should request batch-specific certificates of analysis. For immunoassay development, consider whether native (plasma-derived) or recombinant TBG better suits application needs. Lead times for custom preparations may extend to 6–8 weeks.
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