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J. Biol. Chem., Vol. 262, Issue 8, 3603-3608, Mar, 1987
UP Steinbrecher
Modification of low density lipoproteins (LDL) by oxidation has been shown to permit recognition by the acetyl-LDL receptor of macrophages. The extensive oxidation of LDL that is required before interaction occurs with this receptor produces major alterations in both the lipid and protein components of LDL. Several chemical modifications of LDL also lead to recognition by this receptor; all of these involve derivatization of lysine residues of apolipoprotein B by adducts that neutralize the positively charged epsilon-amino group. The present studies show that oxidation also results in derivatization of LDL lysine residues. Analysis of amino acid composition indicated that 32% of lysine residues were modified after oxidation of LDL by exposure to 5 microM CuSO4 for 20 h. About one-half of the derivatized lysines were labile under the conditions of acid hydrolysis. Fluorescence of LDL protein was greatly increased by oxidation, with excitation maximum at 350 nm and emission maximum at 433 nm. When LDL containing phosphatidylcholine with isotopically labeled arachidonic acid in the sn-2 position was oxidized, there was a 5-fold increase in radioactivity bound to protein compared to nonoxidized LDL or oxidized LDL labeled with 2-[1-14C]palmitoyl phosphatidylcholine. Prior methylation of LDL prevented the rapid uptake and degradation by macrophages that normally accompanies oxidation. These findings suggest that oxidation of LDL is accompanied by derivatization of lysine epsilon-amino groups by lipid products and that these adducts may be important in the interaction of oxidized LDL with the acetyl-LDL receptor.
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