Abstract
The chemical and physical properties of bullfrog serum low density lipoprotein (LDL) were investigated. On a weight percentage basis, LDL contained cholesterol ester, 30.3%; cholesterol, 5.6%; triglyceride, 12.5%; phospholipids, 23.3%; and protein, 22.4%. The fatty acid compositions of triglycerides and major phospholipids from the bullfrog serum LDL were quite similar to those of human serum LDL. However, the fatty acid composition of the chlesterol ester from the bullfrog serum LDL was quite different from that of the human serum LDL. The average particle weight, determined by gel filtration, was 2 X 10(6) daltons. This value is very close to that of human LDL. In the fluorescence emission spectrum of bullfrog serum LDL, the emission maximum was 324 nm. The amino acid composition of the apo-LDL resembled that of human apo-LDL.
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