Overview
Mouse Bone Sialoprotein (BSP) is an acidic, non-collagenous glycoprotein primarily expressed in mineralized tissues such as bone and dentin. It constitutes approximately 8-12% of the non-collagenous proteins in bone matrix. BSP plays a pivotal role in hydroxyapatite nucleation during bone formation and mediates cell-matrix interactions through its RGD (Arg-Gly-Asp) sequence. First identified in the 1980s, BSP has since been recognized as a biomarker for osteoblast differentiation. Its expression is upregulated during bone remodeling and fracture healing. In research settings, recombinant mouse BSP is commonly used to study bone biology, tissue engineering, and pathological calcification processes.
Physical and Chemical Properties
Mouse BSP is characterized by its high degree of post-translational modifications, including glycosylation (30-50% by weight) and phosphorylation. The protein contains numerous glutamic acid residues that confer its acidic nature (pI ~3.5-4.5). Its secondary structure comprises both α-helices and β-sheets, with flexible linker regions. A distinguishing feature is the presence of two extended polyglutamic acid domains that bind calcium ions with high affinity. The protein's solubility is pH-dependent, precipitating at its isoelectric point but remaining stable in neutral buffers. When lyophilized, it typically appears as a fluffy white powder that reconstitutes clearly in appropriate buffers.
Main Applications
In biomedical research, mouse BSP is primarily utilized to investigate bone metabolism and regeneration mechanisms. It's frequently incorporated into 3D scaffolds for bone tissue engineering, where it enhances osteoblast attachment and mineralization. Pharmaceutical studies employ BSP to screen potential osteoporosis drugs that modulate osteoblast activity. The protein also finds application in dental research, particularly in studies on dentinogenesis. Recent advances explore its use in coating orthopedic implants to improve osseointegration. Diagnostic applications include developing ELISA kits to monitor bone turnover markers in preclinical models.
Safety and Storage
While mouse BSP presents low acute toxicity, proper handling with gloves and lab coats is recommended due to potential immunogenicity. Avoid inhalation of lyophilized powder. The protein is stable for 6-12 months when stored at -20°C in aliquots; for extended storage, -80°C is preferred. Reconstituted solutions should be used immediately or stored at 4°C for short-term use (≤48 hours) with protease inhibitors. Repeated freeze-thaw cycles lead to aggregation and loss of bioactivity. Contamination risks are minimized by working in sterile conditions for in vivo applications.
B2B Procurement Guide
When sourcing mouse BSP, prioritize suppliers specializing in extracellular matrix proteins with documented quality controls. Key specifications to request include: Western blot verification of molecular weight, HPLC purity analysis, endotoxin levels (<1 EU/μg), and functional testing (e.g., hydroxyapatite binding assay). For bulk purchases (≥5 mg), negotiate batch-to-batch consistency guarantees. Research-grade purity (≥90%) suffices for most applications, but GMP-grade may be required for clinical translation studies. Lead times typically range 4-8 weeks for custom preparations. Consider suppliers offering characterization data (CD spectra, glycosylation profiles) for critical applications.
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