In vitro oxidative footprinting provides insight into apolipoprotein B-100 structure in low-density lipoprotein.

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.

journal_name

Proteomics

journal_title

Proteomics

authors

Chakraborty S,Cai Y,Tarr MA

doi

10.1002/pmic.201300174

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

2614-22

issue

21-22

eissn

1615-9853

issn

1615-9861

journal_volume

14

pub_type

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