Expression cloning and characterization of a novel glycosylphosphatidylinositol-anchored high density lipoprotein-binding protein, GPI-HBP1

Ryoichi X. Ioka, Man Jong Kang, Shin Kamiyama, Dong Ho Kim, Kenta Magoori, Akihisa Kamataki, Yuichiro Ito, Yumiko A. Takei, Masako Sasaki, Takashi Suzuki, Hironobu Sasano, Sadao Takahashi, Juro Sakai, Takahiro Fujino, Tokuo T. Yamamoto

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69 Citations (Scopus)

Abstract

By expression cloning using fluorescent-labeled high density lipoprotein (HDL), we isolated two clones that conferred the cell surface binding of HDL. Nucleotide sequence of the two clones revealed that one corresponds to scavenger receptor class B, type 1 (SRBI) and the other encoded a novel protein with 228 amino acids. The primary structure of the newly identified HDL-binding protein resembles GPI-anchored proteins consisting of an N-terminal signal sequence, an acidic region with a cluster of aspartate and glutamate residues, an Ly-6 motif highly conserved among the lymphocyte antigen family, and a C-terminal hydrophobic region. This newly identified HDL-binding protein designated GPI-anchored HDL-binding protein 1 (GPI-HBP1), was susceptible to phosphatidylinositol-specific phospholipase C treatment and binds HDL with high affinity (calculated Kd = 2-3 μg/ml). Similar to SRBI, GPI-HBP1 mediates selective lipid uptake but not the protein component of HDL. Among various ligands for SRBI, HDL was most preferentially bound to GPI-HBP1. In contrast to SRBI, GPI-HBP1 lacked HDL-dependent cholesterol efflux. The GPI-HBP1 transcripts were detected with the highest levels in heart and, to a much lesser extent, in lung and liver. In situ hybridization revealed the accumulation of GPI-HBP1 transcripts in cardiac muscle cells, hepatic Kupffer cells and sinusoidal endothelium, and bronchial epithelium and alveolar macrophages in the lung.

Original languageEnglish
Pages (from-to)7344-7349
Number of pages6
JournalJournal of Biological Chemistry
Volume278
Issue number9
DOIs
Publication statusPublished - 2003 Feb 28

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Ioka, R. X., Kang, M. J., Kamiyama, S., Kim, D. H., Magoori, K., Kamataki, A., Ito, Y., Takei, Y. A., Sasaki, M., Suzuki, T., Sasano, H., Takahashi, S., Sakai, J., Fujino, T., & Yamamoto, T. T. (2003). Expression cloning and characterization of a novel glycosylphosphatidylinositol-anchored high density lipoprotein-binding protein, GPI-HBP1. Journal of Biological Chemistry, 278(9), 7344-7349. https://doi.org/10.1074/jbc.M211932200