Journal of Lipid Research, Vol 34, 983-1000, Copyright © 1993 by Lipid Research, Inc.

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Structures and high and low affinity ligand binding properties of murine type I and type II macrophage scavenger receptors

J Ashkenas, M Penman, E Vasile, S Acton, M Freeman and M Krieger
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Macrophage scavenger receptors have been implicated in various macrophage-associated processes, including atherosclerosis and clearance of bacterial endotoxin. They bind to a wide variety of polyanionic ligands and display complex binding characteristics. cDNAs from the murine macrophage-like cell line P388D1 encoding the full- length type I and type II murine scavenger receptors were cloned, sequenced, and expressed in Chinese hamster ovary cells. A fragment of the corresponding murine genomic DNA was also cloned, partially sequenced, and the positions of the cloned intron/exon boundaries were determined. Comparisons of the murine scavenger receptors' sequences with the bovine, rabbit, and human sequences were used to refine a multidomain model of these trimeric, fibrous, membrane receptors. Metabolic labeling/immunoprecipitation experiments showed that most of the macrophage scavenger receptor protein expressed by P388D1 cells was the N-glycosylated type II receptor; only small amounts of type I receptor were detected. Analysis of the binding properties of the receptors provided evidence that such differential expression of the type I and type II forms may have functional significance. There were substantial receptor-type (I vs. II), as well as receptor-species (bovine vs. murine), differences in the inhibition of 125I-labeled AcLDL (acetylated low density lipoprotein) binding by ReLPS, a form of bacterial endotoxin. These differences arose, in part, because these receptors exhibited both high (Kd1(4 degrees C) = 0.05-0.2 micrograms protein/ml) and low (Kd2(4 degrees C) = 2.5-12.8 micrograms protein/ml) affinity binding of 125I-labeled AcLDL. The ability of ReLPS (1 mg/ml) to inhibit either or both of these two classes of binding interactions varied depending on the species and type of receptor.
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