By use of its affinity to gelatin-Cellulofine, a novel protein, GBP28 (gelatin-binding protein of 28 kDa), was obtained from human plasma. GBP28 bound to gelatin-Cellulofine could be eluted with 1 M NaCl. By analysis of its amino-terminal amino acid sequences and the peptides obtained by protease digestion, GBP28 was identified as a novel protein. After repeated gel chromatography of the 1 M NaCl eluate from gelatin-Cellulofine, about 50 micrograms of GBP28 was purified from 500 ml of human plasma. On gel chromatography, the protein migrated as a molecule of about 420 kDa. On SDS-PAGE, its molecular mass was 28 kDa under reducing conditions and 68 kDa under nonreducing conditions. Recently, human mRNA specific to adipose tissue, cDNA clone apM1, has been registered [Maeda, K., Okubo, K., Shimomura, I., Funahashi, T., Matsuzawa, Y., and Matsubara, K. (1996) Biochem. Biophys. Res. Commun. 221, 286-289]. The assumed amino acid sequence of cDNA clone apM1 contained all the sequences of GBP28 and its peptides. Therefore, it is evident that the cDNA clone apM1 encodes GBP28 and the protein is specific to adipose tissue. The clone encodes a polypeptide of 244 amino acids with a secretory signal sequence at the amino terminus, a small non-helical region, a stretch of 22 collagen repeats and a globular domain. Thus, GBP28 appears to belong to a family of proteins possessing a collagen-like domain through which they form homo-trimers, which further combine to make oligomeric complexes. Although its biological function is presently unclear, its adipocyte-specific expression suggests that GBP28 may function as an endogenous factor involved in lipid catabolism and storage or whole body metabolism.

https://www.jstage.jst.go.jp/article/biochemistry1922/120/4/120_4_803/_pdf

Isolation and characterization of GBP28, a novel gelatin-binding protein purified from human plasma.

https://www.cell.com/neuron/pdf/S0896-6273(00)80187-7.pdf

Microglial Cells Internalize Aggregates of the Alzheimer's Disease Amyloid β-Protein Via a Scavenger Receptor

Biochemistry and cell biology of mammalian scavenger receptors

Macrophages interact with other cells and components of the extracellular environment by means of adhesion receptors. Adhesion to artificial substrata in vitro facilitates isolation of macrophages, and has been used to generate antibodies that inhibit their migration in vivo. Unlike other cell types, macrophages attach to tissue culture plastic in the absence of divalent cations. Here we use an adhesion assay exploiting this property to isolate a rat monoclonal antibody, 2F8, which totally inhibits divalent cation-independent adhesion of murine macrophages to tissue culture plastic in the presence of fetal calf serum. Immunoprecipitation from macrophages and stably transfected Chinese hamster ovary cells revealed that the antigen recognized by monoclonal 2F8 is identical to murine macrophage scavenger receptor. We propose a novel function for this molecule, previously described as an endocytic receptor, thus providing a mechanism for mononuclear phagocyte recruitment to and retention in ligand-rich tissues such as in atherosclerotic lesions.

Divalent cation-independent macrophage adhesion inhibited by monoclonal antibody to murine scavenger receptor.

Molecular flypaper, host defense, and atherosclerosis. Structure, binding properties, and functions of macrophage scavenger receptors.

The type I and type II bovine scavenger receptors expressed in Chinese hamster ovary cells are trimeric proteins with collagenous triple helical domains comprising noncovalently associated monomers and Cys83-disulfide-linked dimers.

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The type I and type II bovine scavenger receptors expressed in Chinese hamster ovary cells are trimeric proteins with collagenous triple helical domains comprising noncovalently associated monomers and Cys83-disulfide-linked dimers.