Activation of lecithin:cholesterol acyltransferase by a synthetic model lipid-associating peptide. Academic Article uri icon

Overview

MeSH Major

  • Models, Chemical
  • Peptides
  • Phosphatidylcholine-Sterol O-Acyltransferase

abstract

  • We have synthesized a model lipid-associating peptide of 20 residues (LAP-20) and studied its association with the phospholipid dimyristoyl phosphatidylcholine (DMPC) and its activation of the plasma enzyme lecithin:cholesterol acyl-transferase (EC 2.3.1.43). The lipid-associating behavior of LAP-20 is similar to that of well-characterized native plasma apolipoproteins after which it was modeled. Upon forming an isolated complex with DMPC, LAP-20 exhibits a large blue-shift in its intrinsic fluorescence, converts from a random coil to an alpha -helix, and changes turbid multilamellar structures of DMPC into small complexes that are optically clear. Addition of 2 mol % cholesterol does not detectably alter the structure or properties of the complex. The cholesterol-containing complexes of LAP-20 and DMPC are substrates for LCAT, having an activity 65% of that of complexes composed of DMPC, cholesterol, and the natural activator, apolipoprotein A-I. These findings suggest that the LCAT-activating regions of apoA-I may be confined to relatively short sequences that contain a lipid-binding determinant.

publication date

  • June 1980

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed Central ID

  • PMC349572

PubMed ID

  • 6774331

Additional Document Info

start page

  • 3154

end page

  • 8

volume

  • 77

number

  • 6