Russin T Z, Laine R A, Turco S J
Biochem J. 1981 Aug 1;197(2):327-32. doi: 10.1042/bj1970327.
Particulate membrane preparations from K-562 [human CML (chronic-myelogenous-leukaemia)-derived] cells catalyse the transfer of [3H]galactose from UDP-[3H]-galactose and [3H]N-acetylglucosamine from UDP-[3H]N-acetylglucosamine into an endogenous product that on digestion with Pronase yields long-chain glycopeptides (mol.wt. 7000--10 000) called 'erythroglycan'. Incorporation of either labelled sugar increased up to 60 min of incubation time. The labelled erythroglycan was isolated by chromatography on Sephadex G-50 and characterized by digestion with endo-beta-galactosidase from Escherichia freundii, followed by analysis on Bio-Gel P-2 and paper chromatography. This digestion gave the following four products: (1) a disaccharide with the sequence beta GlcNAc-beta Gal; (2) a trisaccharide with the sequence betaGal-betaGlcNAc-beta Gal; (3) a larger oligosaccharide containing galactose and N-acetylglucosamine; and (4) a putative protein-linkage region.
来自K-562 [源自人慢性粒细胞白血病(CML)]细胞的微粒体膜制剂催化将UDP-[3H]-半乳糖中的[3H]半乳糖和UDP-[3H] -N-乙酰葡糖胺中的[3H] -N-乙酰葡糖胺转移到一种内源性产物中,该产物经链霉蛋白酶消化后产生称为“红细胞聚糖”的长链糖肽(分子量7000 - 10000)。两种标记糖的掺入在孵育60分钟内均增加。标记的红细胞聚糖通过在Sephadex G-50上进行色谱分离,并通过用弗氏埃希氏菌的内切β-半乳糖苷酶消化,然后在Bio-Gel P-2上进行分析和纸色谱法进行表征。这种消化产生了以下四种产物:(1)具有βGlcNAc-βGal序列的二糖;(2)具有βGal-βGlcNAc-βGal序列的三糖;(3)一种含有半乳糖和N-乙酰葡糖胺的较大寡糖;(4)一个假定的蛋白质连接区域。