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A0722 Sigma

Apolipoprotein A-I from human plasma

≥85% (SDS-PAGE), buffered aqueous solution

Synonym: Apo A-I



Related Categories Apolipoproteins, Biochemicals and Reagents, Cell Biology, Cell Signaling and Neuroscience, Cholesterol and Cholesterol Metabolism,
assay   ≥85% (SDS-PAGE)
form   buffered aqueous solution
mol wt   mol wt 28.3 kDa
shipped in   dry ice
storage temp.   −20°C
Gene Information   human ... APOA1(335)



Major protein components in high density lipoprotein (HDL)

Physical form

Solution in 10 mM ammonium bicarbonate

Biochem/physiol Actions

Apo-AI comprises ~70% of the protein moiety in HDL. It is a single polypeptide chain consisting of 245 amino acids with glutamic acid as the C-terminal residue and aspartic acid as the N-terminal residue. The molecular mass is reported to be 28.3 kDa. The protein is made up of one major isoform (pI 5.6) and two minor isoforms (pI 5.53 and 5.46). Apo-AI shows a high content of α-helix structure. The amphipathic regions in the α-helix structure seem to be responsible for lipid binding capacity. In aqueous solution, Apo-AI shows self-association with minor conformation change. Apo-AI activates lecithin-cholesterol (LCAT) acyltransferase, which is responsible for cholesterol esterification in plasma.

Apo-AI levels in normal plasma are 90-130 mg/dl. Apo-AI levels may be inversely related to the risk of coronary disease.

Price and Availability

The Future of Bioimaging

All labs need water
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Cholesterol Transport

Since cholesterol is a water-insoluble molecule it must be packaged for transport within the plasma. The particles that package cholesterol, cholesteryl esters, and triglycerides for transport, are c...
BioFiles 2007, 2.7, 13.
Keywords: Esterifications, Ligands

Plasma Derived Proteins and Enzymes

Despite their complexity, blood and plasma are abundant biological resources for the discovery of drug targets and biomarkers for human disease. It is estimated that plasma may contain as many as 40,...
BioFiles 2006, 1.5, 2.
Keywords: Applications, Gas chromatography, Type

Peer-Reviewed Papers


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