Overview
Cytochrome C is a vital mitochondrial protein involved in the electron transport chain (ETC), facilitating ATP production during oxidative phosphorylation. It is highly conserved across species, reflecting its fundamental role in cellular energy metabolism. The protein consists of a heme group covalently bound to a polypeptide chain, enabling electron transfer between Complex III and Complex IV of the ETC. Beyond its metabolic function, cytochrome C is a key mediator of apoptosis (programmed cell death). When released from mitochondria, it activates caspases, triggering cell death pathways. This dual role makes it invaluable in both basic research and clinical applications, including studies of mitochondrial dysfunction and cancer therapies.
Physical and Chemical Properties
Cytochrome C is a small, water-soluble protein with a molecular weight of approximately 12-12.5 kDa. Its distinctive dark red color arises from the heme group, which contains an iron atom responsible for redox activity. The protein is stable under physiological pH but denatures at high temperatures or extreme pH levels. Its solubility in aqueous solutions makes it suitable for laboratory use, though it requires careful storage to prevent degradation. Spectrophotometric analysis reveals characteristic absorption peaks at 550 nm (reduced form) and 520 nm (oxidized form), which are often used to quantify its concentration and monitor redox states in experiments.
Main Applications
In biomedical research, cytochrome C is widely used to study mitochondrial function, oxidative stress, and apoptosis. It serves as a marker for mitochondrial integrity in assays and is employed in diagnostic kits to detect cellular damage. Therapeutic applications include experimental treatments for ischemia-reperfusion injury and neurodegenerative diseases. The pharmaceutical industry utilizes cytochrome C as a reference standard in drug development, particularly for compounds targeting mitochondrial pathways. Additionally, its role in energy metabolism has spurred interest in biofuel and biotechnology sectors, where it aids in optimizing electron transfer systems for synthetic biology applications.
Safety and Storage
Cytochrome C is generally low in toxicity but may cause allergic reactions in sensitive individuals. Lab personnel should wear gloves and eye protection when handling the powder or solutions. Avoid inhalation and direct contact with skin or mucous membranes. For long-term stability, store lyophilized powder at -20°C in airtight containers. Reconstituted solutions should be aliquoted to minimize freeze-thaw cycles and kept at 4°C for short-term use. Always check for precipitation or discoloration before use, as these may indicate degradation.
B2B Procurement Guide
When sourcing cytochrome C, prioritize suppliers with ISO or GMP certifications to ensure product consistency and traceability. Key specifications to verify include purity (≥95% by HPLC), biological activity (e.g., electron transfer efficiency), and origin (e.g., bovine, equine, or recombinant). Bulk buyers should request batch-specific certificates of analysis (CoA) and stability data. Pricing varies significantly based on purity and scale; negotiate volume discounts for orders exceeding 10 grams. Consider lead times, as custom preparations (e.g., labeled or modified variants) may require extended production schedules.
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