Elongation of N-acetyllactosamine repeats in diantennary oligosaccharides.

Elongation of N-acetyllactosamine repeats in diantennary oligosaccharides.
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二触角寡糖中 N-乙酰基乳糖胺重复序列的延长。

DOI:
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发表时间:
1997
期刊:
European Journal of Biochemistry
影响因子:
--
通讯作者:
A. Hasilik
A. Hasilik
中科院分区:
--
文献类型:
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作者:
M. Hummel;H. Hedrich;A. Hasilik

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糖基化[Asn 22]溶菌酶在中国仓鼠卵巢(CHO)细胞中表达时已显示含有N-乙酰乳糖胺重复序列。我们发现,N-乙酰乳糖胺重复的主要部分与双触角寡糖。在缺乏唾液酸化的Lec 2 CHO细胞中,合成了糖基化溶菌酶,其中终止于β-半乳糖基残基的N-乙酰乳糖胺重复序列的含量增加。在Lec 2细胞和亲本CHO细胞系Pro 5中,溶菌酶中只有一小部分寡糖是三触角型的。以前,已经表明,通过延长β-N-乙酰葡糖胺基转移酶活性的增加和β-1,6-连接的触角的合成,Asn连接的寡糖中N-乙酰乳糖胺重复序列的合成得到增强。与糖基化溶菌酶的结果表明,糖蛋白轴承双触角寡糖可以包含几个N-乙酰乳糖胺重复,后者的数量可以通过降低的封盖唾液酸转移酶的活性增加。
Glycosylated [Asn22]lysozyme has been shown to contain N-acetyllactosamine repeats when expressed in chinese hamster ovary (CHO) cells. We find that the major portion of N-acetyllactosamine repeats are associated with diantennary oligosaccharides. In Lec2 CHO cells, which are deficient in sialylation, glycosylated lysozyme is synthesized with increased contents of N-acetyllactosamine repeats terminating in beta-galactosyl residues. In the Lec2 cells and the parental CHO cell line, Pro 5, only a minor portion of the oligosaccharides in lysozyme are of the triantennary type. Previously, it has been shown that the synthesis of N-acetyllactosamine repeats in Asn-linked oligosaccharides is enhanced by an increase in the activity of the elongating beta-N-acetylglucosaminyl transferase and by the synthesis of beta-1,6-linked antennae. The results with glycosylated lysozyme suggest that glycoproteins bearing diantennary oligosaccharides can contain several N-acetyllactosamine repeats and that the number of the latter can be increased by decreasing the activity of the capping sialyl transferases.
DOI: --
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