Isolation and partial characterization of a mucin-type glycoprotein from plasma membranes of human melanoma cells.
Isolation and partial characterization of a mucin-type glycoprotein from plasma membranes of human melanoma cells.
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从人黑色素瘤细胞质膜中分离和部分表征粘蛋白型糖蛋白。
DOI:
10.1016/0005-2736(81)90309-6
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发表时间:
1981
期刊:
影响因子:
--
通讯作者:
Davidson,EA
中科院分区:
文献类型:
--
作者:
Umemoto,J;Bhavanandan,VP;Davidson,EA
Plasma membranes were isolated from HM7 melanoma cells grown in the presence of [3 H] glucosamine and Na 2 35 SO 4 or [3 H] mannose and [14 C] glucosamine. The labelled glucoconjugates were solubilized with 0.6 M lithium diiodosalicylate/0.5% Triton X-100. Fractionation of glycoconjugates by repeated chromatography on columns of Sepharose CL-6B and DEAE-Sepharose and by affinity chromatography on WGA-Sepharose yielded three radiochemically homogenous glycoproteins. One of these having an apparent molecular weight of 100 000 was found to contain clusters of (AcNeu) 1 or in2 å [Gal å GalNAc] linked O-glycosidically to the protein. One other glycoprotein contained both O-glycosidically and N-glycosidically-linked oligosaccharides, and the third contained only N-glycosidically-linked carbohydrates. Preliminary results indicate that the 100 000 molecular weight mucin-type glycoprotein is present in significantly reduced quantities in cultured human fetal uveal melanocytes. Further, the bulk of the glycoproteins from the melanocytes were of lower molecular size compared to those from the melanoma cells.
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