Structure and conformational analysis of lipid-associating peptides of apolipoprotein B-100 produced by trypsinolysis

Chao yuh Yang, Tae W. Kim, Quein Pao, Lawrence Chan, Roger D. Knapp, Antonio Gotto, Henry J. Pownall

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Apolipoprotein B-100 (apo B-100) contains putative lipid-associating regions that are, in part, responsible for its overall structure in human plasma low-density lipoproteins. Some of these regions have been identified by reassembly of the total tryptic peptides of apo B-100 with bovine brain sphingomyelin, 1-palmitoyl-2-oleoyl phosphatidylcholine (POPC) and dimyristoylphos-phatidylcholine (DPMC). Although more than 500 tryptic peptides are predicted from the known number of arginines and lysines in apo B-100, significant amounts of only 13 peptides spontaneously associate with all three phospholipids. These peptides share some structural characteristics, as predicted by several algorithms, that distinguish them from the water-soluble apolipoproteins. Most apolipoproteins associate with lipids via amphipathic helices and are highly helical in native and reassembled lipoproteins. Analysis of all apo B-100 lipophilic peptides by circular dichroism and by use of a predictive algorithm reveals no evidence of amphipathic helices. Although the predictive algorithm suggested that the lipophilic peptides of apo B-100 contain the sequence determinants for β-sheet, no spectroscopic evidence for this structure was found. We conclude that the lipophilic regions of apo B-100 liberated by trypsinolysis are highly hydrophobic, although their secondary structures do not fit any simple model.

Original languageEnglish (US)
Pages (from-to)689-699
Number of pages11
JournalJournal of Protein Chemistry
Volume8
Issue number6
DOIs
StatePublished - Dec 1989

Keywords

  • apolipoprotein B-100
  • circular dichroism
  • high-performance liquid chromatography
  • lipid-associating region

ASJC Scopus subject areas

  • Biochemistry

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