Overview
PADI4, or Peptidyl Arginine Deiminase 4, is an enzyme that catalyzes the post-translational modification of arginine residues to citrulline in proteins. This process, known as citrullination, plays a pivotal role in various biological processes, including gene regulation and immune response. PADI4 is particularly noted for its involvement in autoimmune diseases such as rheumatoid arthritis, where aberrant citrullination contributes to the generation of autoantigens. Discovered as part of the PADI enzyme family, PADI4 is encoded by the PADI4 gene in humans. Its expression is regulated by inflammatory signals, making it a key player in immune system modulation. Researchers study PADI4 to understand its role in disease mechanisms and potential therapeutic targets.
Physical and Chemical Properties
PADI4 is a calcium-dependent enzyme with a molecular weight of approximately 74 kDa. It functions optimally at physiological pH and temperature, though its activity can vary based on substrate availability and cellular context. The enzyme is typically supplied as a lyophilized powder or in liquid solution for laboratory use, requiring reconstitution in appropriate buffers. Structurally, PADI4 contains five conserved domains critical for its catalytic activity, including a calcium-binding site essential for enzyme function. Its solubility in aqueous buffers makes it suitable for in vitro assays, though stability can be affected by prolonged exposure to room temperature or improper storage conditions.
Main Applications
PADI4 is extensively used in biomedical research, particularly in studies related to autoimmune diseases. Its role in citrullinating proteins like histones and fibrinogen has implications for understanding rheumatoid arthritis pathogenesis. Researchers also investigate PADI4 in epigenetics, where it influences gene expression by modifying chromatin structure. In cancer research, PADI4's overexpression in certain tumors has been linked to tumor progression and metastasis. Pharmaceutical companies explore PADI4 inhibitors as potential therapeutics, targeting its enzymatic activity to modulate disease processes. Additionally, PADI4 serves as a biomarker in diagnostic assays for autoimmune conditions.
Safety and Storage
Handling PADI4 requires standard laboratory precautions, including the use of gloves and eye protection to prevent exposure. The enzyme should be stored at -20°C in aliquots to avoid repeated freeze-thaw cycles, which can degrade its activity. Lyophilized preparations are stable for extended periods when kept desiccated. In case of accidental exposure, rinse affected areas with water and seek medical advice if irritation persists. Dispose of waste materials according to institutional guidelines for biological reagents. Always refer to the material safety data sheet (MSDS) provided by the supplier for specific handling instructions.
B2B Procurement Guide
When procuring PADI4 for research or industrial use, prioritize suppliers with certifications for biological reagents. Key considerations include enzyme purity (typically >90% by SDS-PAGE) and specific activity, which should be verified via assay data. Bulk purchases may offer cost savings, but ensure proper storage facilities are available. Request batch-specific certificates of analysis to confirm quality parameters. For specialized applications, consider custom formulations or tagged versions (e.g., His-tagged PADI4) to facilitate purification or detection. Lead times can vary, so plan orders in advance, especially for international shipments requiring cold chain logistics.
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