Overview
Electron Transfer Flavoprotein (ETF) is a soluble mitochondrial protein that shuttles electrons between primary dehydrogenases and the membrane-bound ETF-ubiquinone oxidoreductase. As a central component of fatty acid β-oxidation and branched-chain amino acid catabolism, ETF plays a critical role in energy metabolism. The protein exists as an αβ heterodimer, binding one molecule of FAD (flavin adenine dinucleotide) as its redox-active prosthetic group. Genetic defects in ETF or its partner enzymes cause glutaric acidemia type II, highlighting its clinical significance.
Physical and Chemical Properties
ETF exhibits characteristic yellow coloration due to its FAD cofactor, with absorption peaks at 370 nm and 440 nm. The protein demonstrates remarkable stability at physiological pH (7.0-7.4) but denatures rapidly above 60°C. Its redox potential ranges between -50 mV to +50 mV depending on the biological source. Crystallographic studies reveal a butterfly-shaped structure with the FAD molecule buried between the α and β subunits. The protein's isoelectric point varies between 4.5-6.0 across species. ETF shows highest solubility in low-ionic strength buffers (e.g., 20 mM Tris-HCl).
Main Applications
In research settings, purified ETF serves as an essential reagent for studying mitochondrial oxidation pathways. It's used to reconstitute enzymatic assays for acyl-CoA dehydrogenases and other flavoenzymes. Pharmaceutical companies employ ETF in drug discovery targeting metabolic disorders. Clinical laboratories utilize ETF antibodies for diagnosing metabolic diseases via Western blot or ELISA. Recent biotechnological applications include incorporating ETF into bioelectrochemical systems for their efficient electron transfer capabilities.
Safety and Storage
While ETF poses minimal health risks, standard protein handling precautions apply: use gloves, avoid inhalation of lyophilized powder, and employ proper waste disposal. The protein is stable for years when stored at -80°C in 25% glycerol-containing buffers with 1 mM DTT to prevent oxidation. For working solutions, maintain ETF on ice and avoid repeated freeze-thaw cycles. The FAD cofactor is light-sensitive; minimize exposure to direct sunlight during experiments. Always centrifuge briefly before use to remove potential aggregates.
B2B Procurement Guide
When sourcing ETF, specify the biological source (human recombinant, bovine, or microbial) required for your application. Reputable suppliers provide certificates of analysis including purity (>95% by SDS-PAGE), concentration (typically 5-10 mg/mL), and specific activity data. For large-scale purchases (gram quantities), consider custom expression services using E. coli or insect cell systems. Verify cold chain logistics for shipments, requiring dry ice packaging. Leading suppliers include Sigma-Aldrich, Abcam, and specialized enzyme manufacturers like BioVision.
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