Rat Plasminogen
Overview
Rat plasminogen (Plg) is an inactive proenzyme synthesized in the liver that circulates in blood plasma. As the precursor to plasmin, it plays a central role in fibrinolysis – the physiological process that degrades blood clots. The protein contains distinct structural domains including a PAN/apple domain, five kringle domains, and a serine protease domain. In biomedical research, rat plasminogen is particularly valuable for creating physiologically relevant animal models due to the high similarity between rodent and human fibrinolytic systems. Researchers utilize it to study thrombosis, inflammation, and tissue remodeling processes where plasminogen activation is a critical pathway.
Physical and Chemical Properties
Rat plasminogen is a single-chain glycoprotein with a molecular weight of approximately 90-92 kDa. The protein exhibits typical characteristics of globular plasma proteins, with an isoelectric point around pH 6-7. Its solubility depends on buffer conditions, with optimal stability in neutral pH solutions containing mild detergents. The protein's structure becomes protease-resistant when bound to fibrin through its lysine-binding kringle domains. This property is exploited in purification processes using lysine-affinity chromatography. Under reducing conditions, SDS-PAGE analysis typically shows a major band at ~90kDa with possible minor bands from glycosylation variants.
Main Applications
In thrombosis research, rat plasminogen is used to study clot dissolution mechanisms and evaluate thrombolytic drugs. The protein's role in extracellular matrix degradation makes it crucial for cancer metastasis studies, particularly in models investigating tumor cell invasion through basement membranes. Tissue engineering applications utilize plasminogen to modulate wound healing processes, where controlled activation influences scar formation. Recent neurobiology research also examines its neuroprotective effects in stroke models. For drug development, rat plasminogen serves as a critical reagent for testing species-specific plasminogen activators like streptokinase derivatives.
Safety and Storage
Rat plasminogen requires careful handling as a biological material of animal origin. While not classified as hazardous, proper biosafety level 1 precautions should be followed. The lyophilized form is stable at -20°C for 2-3 years, while reconstituted solutions should be aliquoted and stored at -80°C for long-term preservation. Repeated freeze-thaw cycles should be avoided as they may cause protein aggregation. Solutions should be prepared in sterile conditions using endotoxin-free buffers. For functional assays, the use of protease inhibitors (except during activation steps) helps maintain protein integrity during experimental procedures.
B2B Procurement Guide
When sourcing rat plasminogen, verify the supplier's animal welfare compliance and country of origin. Key specifications include: purity level (typically >90% by SDS-PAGE), endotoxin content (<1EU/μg), functionality (measured by activation kinetics), and absence of contaminating proteases. Bulk purchasers should request batch-specific certificates of analysis and consider pilot testing for critical applications. Leading suppliers include MilliporeSigma, Abcam, and R&D Systems, with prices varying based on purification method and quality controls. For GMP-grade material required in therapeutic development, expect significantly higher costs and longer lead times.
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