Apoprotein E (Apo E)
Apo E is a protein found in VLDLs, LDLs, and HDLs (Table 18.1). With a molecular weight of 33,000, Apo E is involved in binding lipoprotein complexes to the LDL receptor. Apo E is found in the human Apo C-II gene cluster and a variant of Apo E has been associated with an increased risk for Alzheimer's disease.