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J. Biol. Chem., Vol. 266, Issue 31, 20767-20772, Nov, 1991
S Cheifetz and J Massague
Cell Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, New York 10021.
We report the identification of cell surface glycoproteins that bind transforming growth factor-beta (TGF-beta) in an isoform-specific manner, and are distinct from TGF-beta receptors I and II or the TGF- beta binding proteoglycan beta-glycan. The novel TGF-beta binding proteins have been identified in various cell lines including fetal bovine heart endothelial cells and MG-63 human osteosarcoma cells. They include proteins of 90-100 and 180 kDa that preferentially bind TGF- beta 1 (KD 0.1-0.2 nM) and proteins of 60 and 140 kDa that preferentially bind TGF-beta 2 (KD 0.5-1 nM). The 180-kDa TGF-beta 1 binding protein and the 60- and 140-kDa TGF-beta 2 binding proteins can be released from the cell surface by treatment with phosphatidylinositol-specific phospholipase C, suggesting that these proteins are attached to the plasma membrane through a phosphatidylinositol anchor. The expression of these three proteins as well as their sensitivity to phosphatidylinositol-specific phospholipase C is cell line-dependent. The 90-100-kDa TGF-beta 1 binding proteins are components of a 190-kDa disulfide-linked complex. The structural properties of these proteins and their high affinity and selectivity for different TGF-beta isoforms defines them as a novel class of cell surface TGF-beta binding proteins.
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