Overview
Thyroglobulin (Tg) is a dimeric glycoprotein synthesized exclusively by thyroid follicular cells. It serves as the precursor and storage macromolecule for thyroid hormones thyroxine (T4) and triiodothyronine (T3). The protein comprises approximately half of the thyroid gland's total protein content and plays a central role in iodine metabolism. Structurally, thyroglobulin contains 2,748 amino acids (human variant) with multiple tyrosine residues that undergo iodination. Its large size (660 kDa) and complex glycosylation pattern make it unique among endocrine proteins. Clinically, Tg measurements are crucial for monitoring thyroid cancer recurrence after thyroidectomy.
Physical and Chemical Properties
As a glycoprotein, thyroglobulin exhibits typical protein characteristics including UV absorption at 280 nm and solubility in aqueous buffers. Its isoelectric point ranges between 4.5-5.0 due to abundant sialic acid residues in carbohydrate moieties. The protein's stability depends on pH (optimal 6.5-8.0) and requires reducing conditions to prevent aggregate formation. Under electron microscopy, thyroglobulin appears as a dumbbell-shaped dimer with dimensions of 15×30 nm. The protein contains approximately 8-10% carbohydrates by weight, including N-linked oligosaccharides critical for proper folding and intracellular transport. Its iodine-binding capacity reaches up to 0.5% by weight when fully iodinated.
Main Applications
In clinical diagnostics, thyroglobulin serves as a tumor marker for differentiated thyroid carcinomas (papillary and follicular). Post-operative Tg levels help assess treatment efficacy and detect metastases. Commercial immunoassays can measure serum Tg concentrations as low as 0.1 ng/mL. Research applications include studies of Hashimoto's thyroiditis and Graves' disease, where anti-thyroglobulin antibodies are pathological markers. The protein is also used in in vitro studies of thyroid hormone biosynthesis and as a reference material in proteomics research due to its distinctive mass and glycosylation pattern.
Safety and Storage
Thyroglobulin poses minimal biological hazard when handled properly. As with all proteins, avoid inhalation of powder and direct skin contact. Use personal protective equipment (gloves, lab coat) when reconstituting lyophilized material. For long-term stability, store lyophilized thyroglobulin at -20°C or lower in airtight containers with desiccant. Reconstituted solutions should be aliquoted and kept at -80°C for extended storage. Avoid repeated freeze-thaw cycles as this can cause protein degradation. Working solutions in PBS (pH 7.4) remain stable for 1 week at 4°C when sterile-filtered.
B2B Procurement Guide
When sourcing thyroglobulin for industrial or diagnostic use, prioritize suppliers with ISO 13485 certification for medical-grade material. Key specifications to verify include: purity (>90% by HPLC or SDS-PAGE), endotoxin levels (<1 EU/μg for in vivo use), and antibody reactivity (for immunoassay components). Bulk buyers should request certificate of analysis with mass spectrometry data confirming protein identity. Consider species specificity - human thyroglobulin commands premium pricing ($400-600/mg) versus porcine/bovine variants ($200-300/mg). For antibody production, fragmented Tg may offer cost advantages while maintaining immunogenicity.
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