Overview
Apolipoprotein A-I is a 243-amino acid protein synthesized primarily in the liver and intestine. As the main structural component of HDL (high-density lipoprotein), it accounts for about 70% of HDL's protein content. Its evolutionary conservation across mammals underscores its critical role in lipid metabolism. In clinical medicine, ApoA-I levels serve as a biomarker for cardiovascular disease risk assessment. The protein's ability to promote reverse cholesterol transport—moving cholesterol from peripheral tissues back to the liver—makes it a focus of atherosclerosis research and potential therapeutic development.
Physical and Chemical Properties
ApoA-I exhibits an amphipathic α-helix structure that enables lipid binding. The protein's N-terminal domain mediates self-association, while the C-terminal domain binds lipids. Its isoelectric point ranges between 5.4-5.8 depending on species and post-translational modifications. The protein demonstrates remarkable stability in plasma (half-life ~5 days) but requires proper storage conditions when isolated. Recombinant forms typically show >95% purity by SDS-PAGE and maintain functional activity when stored at -80°C in lyophilized or glycerol-containing solutions.
Main Applications
In research settings, ApoA-I is used to study HDL biogenesis, cholesterol efflux mechanisms, and inflammation modulation. Pharmaceutical companies investigate its mimetic peptides for treating atherosclerosis. Diagnostic manufacturers incorporate ApoA-I measurements in lipid panels to calculate cardiovascular risk indices. The protein also finds use in creating reconstituted HDL particles for drug delivery systems. Recent studies explore its potential in Alzheimer's disease due to its role in amyloid-beta clearance.
Safety and Storage
While endogenous ApoA-I poses minimal risk, laboratory preparations require standard biosafety level 1 precautions. Avoid repeated freeze-thaw cycles to prevent aggregation. Lyophilized proteins should be reconstituted in sterile buffers with gentle mixing. For long-term storage, aliquot solutions in protein-stabilizing buffers containing 10-20% glycerol. Monitor for precipitation or turbidity indicating degradation. Commercial preparations often include certificates of analysis detailing endotoxin levels (<1 EU/μg recommended for cell culture applications).
B2B Procurement Guide
When sourcing ApoA-I, verify the supplier's quality control measures including mass spectrometry verification and functional assays. Research-grade material should demonstrate proper migration in native PAGE and cholesterol efflux activity. Consider production methods: recombinant E. coli systems offer cost advantages but may lack post-translational modifications present in mammalian-cell expressed or plasma-purified versions. For diagnostic manufacturing, ensure lot-to-lot consistency meets regulatory requirements.
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