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细胞表面唾液酸残基在麦胚凝集素与亲本及麦胚凝集素抗性中国仓鼠卵巢细胞结合中的差异参与情况。

Differential involvement of cell surface sialic acid residues in wheat germ agglutinin binding to parental and wheat germ agglutinin-resistant Chinese hamster ovary cells.

作者信息

Stanley P, Sudo T, Carver J P

出版信息

J Cell Biol. 1980 Apr;85(1):60-9. doi: 10.1083/jcb.85.1.60.

Abstract

Two Chinese hamster ovary (CHO) cell mutants selected for resistance to wheat germ agglutinin (WGA) have been shown to exhibit defective sialylation of membrane glycoproteins and a membrane glycolipid, GM3. The mutants (termed WgaRII and WgaRIII) have been previously shown to belong to different genetic complementation groups and to exhibit different WGA-binding abilities. These mutants and a WGA-resistant CHO cell mutant termed WgaRI (which also possesses a surface sialylation defect arising from a deficient N-acetylglucosaminyltransferase activity), have enabled us to investigate the role of sialic acid in WGA binding at the cell surface. Scatchard plots of the binding of 125I-WGA (1 ng/ml to 1 mg/ml) to parental and WgaR CHO cells before and after a brief treatment with neuraminidase provide evidence for several different groups of sialic acid residues at the CHO cell surface which may be distinquished by their differential involvement in WGA binding to CHO cells.

摘要

已证实,通过筛选获得的两种对麦胚凝集素(WGA)具有抗性的中国仓鼠卵巢(CHO)细胞突变体,其膜糖蛋白和一种膜糖脂GM3的唾液酸化存在缺陷。这些突变体(称为WgaRII和WgaRIII)先前已被证明属于不同的遗传互补组,并表现出不同的WGA结合能力。这些突变体以及另一种称为WgaRI的对WGA具有抗性的CHO细胞突变体(其表面唾液酸化缺陷也是由N - 乙酰葡糖胺基转移酶活性不足引起的),使我们能够研究唾液酸在细胞表面WGA结合中的作用。在用神经氨酸酶进行短暂处理前后,125I - WGA(浓度从1 ng/ml到1 mg/ml)与亲本CHO细胞和WgaR CHO细胞结合的Scatchard图,为CHO细胞表面存在几组不同的唾液酸残基提供了证据,这些残基可能因其在WGA与CHO细胞结合中的不同参与情况而有所区别。

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