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  • Title: Purification of a new type high molecular weight receptor (type V receptor) of transforming growth factor beta (TGF-beta) from bovine liver. Identification of the type V TGF-beta receptor in cultured cells.
    Author: O'Grady P, Kuo MD, Baldassare JJ, Huang SS, Huang JS.
    Journal: J Biol Chem; 1991 May 05; 266(13):8583-9. PubMed ID: 1850748.
    Abstract:
    A 400-kDa transforming growth factor beta (TGF-beta) receptor was purified from plasma membranes of bovine liver using Triton X-100 extraction, wheat germ lectin-Sepharose 4B affinity chromatography, DEAE-cellulose anion exchange chromatography, and Sepharose CL-4B gel filtration chromatography. This procedure yielded approximately 20 micrograms of the receptor from 1 kg of bovine liver. During purification, the 400-kDa TGF-beta receptor was detected by a cross-linking assay in which the TGF-beta receptor-125I-TGF-beta complex was cross-linked by disuccinimidyl suberate, a bifunctional reagent, and analyzed by 5.5% sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by autoradiography. This novel 400-kDa TGF-beta receptor was also identified on cultured cells including cells reported to lack the type III receptor. The 400-kDa TGF-beta receptor, a nonproteoglycan glycoprotein, appears to be distinct from TGF-beta receptors (types I, II, III, and IV) previously identified on cultured cells and is designated as the type V receptor. The 400-kDa TGF-beta receptor as well as type I, II, and III receptors underwent internalization upon 125I-TGF-beta binding in mink lung epithelial cells.
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