Reichert EC

References (1)

Title : Identification of a domain that mediates association of platelet-activating factor acetylhydrolase with high density lipoprotein - Gardner_2008_J.Biol.Chem_283_17099
Author(s) : Gardner AA , Reichert EC , Topham MK , Stafforini DM
Ref : Journal of Biological Chemistry , 283 :17099 , 2008
Abstract : The plasma form of platelet-activating factor (PAF) acetylhydrolase (PAF-AH), also known as lipoprotein-associated phospholipase A(2) (Lp-PLA(2)) inactivates potent lipid messengers such as PAF and modified phospholipids generated in settings of oxidant stress. In humans, PAF-AH circulates in blood in fully active form and associates with high and low density lipoproteins (HDL and LDL). Several studies suggest that the location of PAF-AH affects both the catalytic efficiency and the function of the enzyme in vivo. The distribution of PAF-AH among lipoproteins varies widely among mammals. Here, we report that mouse and human PAF-AHs associate with human HDL particles of different density. We made use of this observation in the development of a binding assay to identify domains required for association of human PAF-AH with human HDL. Sequence comparisons among species combined with domain-swapping and site-directed mutagenesis studies led us to the identification of C-terminal residues necessary for the association of human PAF-AH with human HDL. Interestingly, the region identified is not conserved among PAF-AHs, suggesting that PAF-AH interacts with HDL particles in a manner that is unique to each species. These findings contribute to our understanding of the mechanisms responsible for association of human PAF-AH with HDL and may facilitate future studies aimed at precisely determining the function of PAF-AH in each lipoprotein particle.
ESTHER : Gardner_2008_J.Biol.Chem_283_17099
PubMedSearch : Gardner_2008_J.Biol.Chem_283_17099
PubMedID: 18434304
Gene_locus related to this paper: human-PLA2G7