Overview
Calbindin is a calcium-binding protein that plays a vital role in calcium transport and homeostasis in vertebrates. It exists in two primary isoforms: calbindin-D28k, predominantly found in the brain and kidneys, and calbindin-D9k, mainly located in the intestines. These proteins are critical for processes such as calcium absorption, neuronal signaling, and bone mineralization. The expression of calbindin is regulated by vitamin D, highlighting its importance in calcium metabolism. Deficiencies or dysregulation of calbindin have been linked to various diseases, including osteoporosis and neurodegenerative disorders like Parkinson's and Alzheimer's.
Physical and Chemical Properties
Calbindins are small, soluble proteins with high thermal stability and resistance to proteolytic degradation. Calbindin-D28k has a molecular weight of approximately 28 kDa, while calbindin-D9k is smaller, at around 9 kDa. Both isoforms exhibit high affinity for calcium ions, with binding capacities that are essential for buffering intracellular calcium levels. The proteins are typically supplied as lyophilized powders and are soluble in aqueous buffers. Their stability under various pH and temperature conditions makes them suitable for experimental and diagnostic applications.
Main Applications
Calbindin is extensively used in biomedical research, particularly in studies related to calcium signaling and homeostasis. It serves as a biomarker for certain neuronal populations and is investigated in the context of neurodegenerative diseases. Additionally, calbindin-D9k is studied for its role in intestinal calcium absorption and bone health. In clinical settings, calbindin levels are measured to assess calcium-related metabolic disorders. The protein is also utilized in the development of therapeutic strategies for conditions like osteoporosis and epilepsy.
Safety and Storage
Calbindin is generally non-toxic but should be handled with standard laboratory precautions to avoid irritation. Proper storage is critical to maintain its stability; it should be kept at -20°C in a dry environment. Repeated freeze-thaw cycles should be minimized to prevent degradation. When working with calbindin, use protective equipment such as gloves and goggles. Ensure proper disposal of waste materials in accordance with local regulations.
B2B Procurement Guide
When procuring calbindin, prioritize suppliers with a proven track record of providing high-purity products. Request certificates of analysis (CoA) to verify purity, typically assessed via SDS-PAGE or HPLC. Batch-to-batch consistency is crucial for experimental reproducibility. Consider the intended application when selecting the isoform (D28k or D9k) and purity level. Prices vary based on purity and supplier, with research-grade calbindin typically ranging from $100 to $500 per mg.
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