Overview
Cyclophilins are a highly conserved family of proteins found in all living organisms, from bacteria to humans. These proteins function primarily as peptidyl-prolyl cis-trans isomerases (PPIases), enzymes that catalyze the isomerization of peptide bonds preceding proline residues, a rate-limiting step in protein folding. The human genome encodes about 17 cyclophilin isoforms, with cyclophilin A (CypA) being the most abundant and well-characterized member. Discovered in 1984 as the cellular binding protein for the immunosuppressive drug cyclosporine, cyclophilins have since been recognized for their diverse roles in cellular processes. These include protein trafficking, signal transduction, and modulation of immune responses. The interaction between cyclophilins and cyclosporine forms the basis of this drug's immunosuppressive effects, making these proteins important targets in transplantation medicine and autoimmune disease research.
Physical and Chemical Properties
Cyclophilins are relatively small proteins, typically ranging from 18 to 40 kDa in molecular weight depending on the isoform. They exhibit remarkable stability, maintaining their enzymatic activity across a wide pH range and at elevated temperatures. The active site contains a characteristic eight-stranded β-barrel structure that creates a hydrophobic pocket for substrate binding. The PPIase activity of cyclophilins can be measured using artificial peptide substrates or by more sophisticated spectroscopic methods. This activity is sensitive to inhibition by cyclosporine and related compounds. From a biochemical perspective, cyclophilins are highly soluble proteins with isoelectric points typically around pH 8-9, making them positively charged at physiological pH.
Main Applications
In pharmaceutical research, cyclophilins are primarily studied for their role in immunosuppression and as potential drug targets. The cyclophilin-cyclosporine complex inhibits calcineurin, a key enzyme in T-cell activation, forming the basis of cyclosporine's therapeutic use in organ transplantation and autoimmune diseases. Beyond immunosuppression, cyclophilins are investigated for their involvement in viral infections (particularly HIV and hepatitis C), cancer progression, and neurodegenerative disorders. In biotechnology, cyclophilin's PPIase activity is sometimes exploited to improve protein folding in recombinant protein production systems. Research-grade cyclophilins are essential tools for studying protein folding dynamics and developing new therapeutic agents.
Safety and Storage
Purified cyclophilins are generally considered safe for laboratory use at typical working concentrations. However, appropriate biosafety level (BSL) precautions should be followed when handling any biological material. Personal protective equipment including lab coats, gloves, and eye protection is recommended. For long-term storage, lyophilized cyclophilin should be kept at -20°C in a desiccated environment. Reconstituted proteins are best stored in small aliquots at -80°C to avoid repeated freeze-thaw cycles that can degrade protein activity. Buffers containing glycerol (10-50%) can help stabilize the protein when stored at -20°C. Always check the manufacturer's recommendations for specific storage conditions of commercial preparations.
B2B Procurement Guide
When procuring cyclophilin for research or industrial applications, several factors should be considered. First, specify whether you require native or recombinant protein, as this affects both price and potential applications. Recombinant cyclophilins expressed in E. coli are most common and cost-effective for many research purposes. Purity requirements should be clearly stated, with >90% purity suitable for most enzymatic studies but ≥98% potentially needed for structural or therapeutic applications. Consider whether you need the protein with or without tags (e.g., His-tag for purification). Lead times can vary significantly between suppliers, so plan purchases accordingly. For large-scale or GMP-grade requirements, establish relationships with specialized manufacturers well in advance of project timelines.
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