<prompt> Apolipoprotein E is rich inLysineArginineHistidineMethionine  <response>: TYPES OF APOPROTEINS PRESENT IN VARIOUS LIPOPROTEIN FRACTIONS CHEMISTRY OF APOPROTEINSHDL: Two major apoproteins of HDL are designated as apo-A-I and apo-A-II. In addition to the above, HDL also contains apo-C-I, C-II, and C-III. HDL-3 is characterised by having apo-D and HDL may also acquire arginine-rich apo-E.LDL: The main apoprotein of LDL is apo-B100, which is also present in VLDL.Chylomicrons: Principal apoprotein of chylomicrons is apo-B48 Mol.wt 200 Kd. In addition, chylomicrons also contain apo-A AI and AII and apo-C C-II and C-III, also arginine-rich apo-E 34 Kd. Apo- C seems to be freely transferable between chylomicrons and VLDL on one hand and HDL on the other.VLDL and LDL: Principal apoproteins of VLDL, IDL, and LDL is apo-B100 350 Kd. They also contain apo-C C-I, C-II, and C-III, and apo-E. IDL carries some apo-E apoprotein. Apo-E: Arginine-rich apo-E, isolated from VLDL. It contains arginine to the extent of 10 percent of the total amino acids and accounts for 5 to 10 percent of total VLDL apo-proteins in normal subjects but is present in excess in the broad b-VLDL of patients of type III hyperlipoproteinemia. Carbohydrate content: Carbohydrates account for approx. 5 percent Apo-B and include mannose, galactose, fucose, glucose, glucosamine and sialic acid. So, some of the lipoproteins are glycoproteins.Ref: Textbook of Medical Biochemistry 8th Edition Dr Brig MN Chatterjea, Rana Shinde page no: 445 