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- W2044057467 abstract "Low-density lipoprotein (LDL) is a major cholesterol carrier in human blood. Oxidations of apolipoprotein B-100 (apo B-100, LDL protein) could be proatherogenic and play critical roles in early stages of plaque formation in the arterial wall. The structure of apo B-100 is still poorly understood, partially due to its size (550 KDa, 4563 amino acids). To gain an insight into LDL structure, we mapped the regions of apo B-100 in human LDL that were prone to oxidation using peroxynitrite and hypochlorite as probes. In this study, LDL was incubated with various concentrations of peroxynitrite and sodium hypochlorite in bicarbonate buffer. The LDL protein apo B-100 was delipidated, denatured, alkylated, and subjected to tryptic digestion. Tryptic peptides were analyzed employing LC-MS/MS. Database search was performed against the apo B-100 database (SwissProt accession #P04114) using SEQUEST algorithm to identify peroxynitrite and hypochlorite-mediated oxidations markers nitrotyrosine, nitrotryptophan, hydroxy-tryptophan, and 3-chlorotyrosine. Several site-specific oxidations were identified in apo B-100 after treatment of intact LDL particles with the oxidants. We hypothesize that these regions could be accessible to oxidant and critical for early events in atherosclerotic plaque deposition." @default.
- W2044057467 created "2016-06-24" @default.
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- W2044057467 date "2014-10-09" @default.
- W2044057467 modified "2023-10-01" @default.
- W2044057467 title "In vitro oxidative footprinting provides insight into apolipoprotein B-100 structure in low-density lipoprotein" @default.
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- W2044057467 doi "https://doi.org/10.1002/pmic.201300174" @default.
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