Overview
Osteocalcin, also known as Bone Gla protein (BGP), is a small non-collagenous protein synthesized by osteoblasts during bone formation. It constitutes about 15% of non-collagenous bone proteins and is considered a biomarker for bone turnover. The protein contains three gamma-carboxyglutamic acid residues, which enable calcium binding and hydroxyapatite crystallization. First isolated in 1975, osteocalcin has since been extensively studied for its endocrine functions, including glucose metabolism regulation. Its synthesis depends on vitamin K, making it a sensitive indicator of vitamin K status. In clinical settings, osteocalcin levels are measured to assess bone formation rates in metabolic bone diseases.
Physical and Chemical Properties
Osteocalcin is a heat-labile protein with a molecular weight of approximately 5.8 kDa. Its structure includes a 49-amino acid chain with three vitamin K-dependent γ-carboxyglutamate (Gla) residues, crucial for calcium ion chelation. The protein exhibits maximum stability at pH 7-8 and degrades rapidly under strong acidic or alkaline conditions. In solution, osteocalcin forms dimers or trimers depending on calcium concentration. Its isoelectric point ranges between 4.0-5.5. The protein shows characteristic absorbance at 280 nm due to tyrosine and phenylalanine residues. Fourier-transform infrared spectroscopy (FTIR) typically reveals amide I and II bands at 1650 cm⁻¹ and 1540 cm⁻¹, respectively.
Main Applications
In biomedical research, osteocalcin serves as a gold-standard biomarker for osteoblast activity. Commercial ELISA kits quantify serum/plasma levels to diagnose osteoporosis, Paget's disease, and monitor bisphosphonate therapy efficacy. Recent studies explore its role as a hormone regulating energy metabolism and male fertility. The pharmaceutical industry utilizes recombinant osteocalcin in drug development for metabolic disorders. In dentistry, it aids in studying dentinogenesis and periodontal bone loss. Some cosmetic formulations incorporate osteocalcin-derived peptides for alleged anti-aging effects on skin elasticity, though clinical evidence remains limited.
Safety and Storage
As a biological substance, osteocalcin requires careful handling. Use nitrile gloves and safety goggles when preparing solutions. Avoid generating aerosols during reconstitution of lyophilized powder. Spills should be cleaned with 70% ethanol followed by water. For long-term preservation, store lyophilized osteocalcin at -20°C in sealed vials with desiccant. Reconstituted solutions maintain stability for 1-2 weeks at 4°C when sterile-filtered (0.22 μm). For extended storage, aliquot and freeze at -80°C with carrier proteins (e.g., 0.1% BSA) to prevent surface adsorption losses.
B2B Procurement Guide
When sourcing osteocalcin, prioritize suppliers with ISO 13485 certification for in-vitro diagnostic materials. Key specifications include: ≥95% purity (verified by HPLC and mass spectrometry), endotoxin levels <0.1 EU/μg, and absence of microbial contamination. Request batch-specific certificates of analysis including amino acid sequencing data. For research applications, consider species-specific variants (human, mouse, rat). Bulk quantities (100mg+) typically offer 20-30% cost savings. Lead times average 4-6 weeks for custom synthesis. Evaluate cold chain logistics - shipments should include dry ice packs and temperature monitors for international transport.
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