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:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Davidson,EA
Davidson,EA
中科院分区:
--
文献类型:
--
作者:
Umemoto,J;Bhavanandan,VP;Davidson,EA

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从在[3 H]葡糖胺和Na 2 35 SO 4或[3 H]甘露糖和[14 C]葡糖胺存在下生长的HM 7黑色素瘤细胞中分离质膜。用0.6M二碘水杨酸锂/0.5%Triton X-100溶解标记的葡糖缀合物。通过Sepharose CL-6 B和DEAE-Sepharose柱上的重复层析以及通过WGA-Sepharose上的亲和层析对糖缀合物进行分级,得到三种放射化学均质的糖蛋白。其中一个具有100 000的表观分子量被发现含有(AcNeu)1或in 2 β [Gal β GalNAc]的簇,其O-糖苷连接到蛋白质上。另一种糖蛋白含有O-糖苷和N-糖苷连接的寡糖,第三种糖蛋白仅含有N-糖苷连接的碳水化合物。初步结果表明,分子量为100,000的粘蛋白型糖蛋白在培养的人胎儿葡萄膜黑素细胞中的含量显着减少。此外,与来自黑素瘤细胞的糖蛋白相比,来自黑素细胞的糖蛋白的大部分具有较低的分子大小。
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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