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多花黑麦草胚乳细胞中阿拉伯半乳聚糖蛋白的生物合成。半乳糖基转移酶的亚细胞分布。

Biosynthesis of arabinogalactan-protein in Lolium multiflorum (Italian ryegrass) endosperm cells. Subcellular distribution of galactosyltransferases.

作者信息

Schibeci A, Pnjak A, Fincher G B

出版信息

Biochem J. 1984 Mar 1;218(2):633-6. doi: 10.1042/bj2180633.

Abstract

Intracellular membranes from protoplasts of Italian-ryegrass (Lolium multiflorum) endosperm cells have been fractionated on sucrose density gradients and identified on the basis of putative-marker-enzyme assays. Galactosyltransferases capable of incorporating galactose from UDP galactose into 66% ethanol-soluble products are associated with all membrane fractions. Affinity chromatography of the ethanol-insoluble products on (murine myeloma protein J539)-Sepharose reveals that the enzymes responsible for the synthesis of polymers containing (1----6)-beta-D-galactose residues are associated exclusively with subcellular fractions enriched in Golgi-derived membranes. This suggests that the Golgi apparatus plays an important part in the synthesis of the carbohydrate component of the ryegrass arabinogalactan-protein.

摘要

对意大利黑麦草(多花黑麦草)胚乳细胞原生质体的细胞内膜进行了蔗糖密度梯度分级分离,并根据假定的标记酶测定法进行了鉴定。能够将来自UDP-半乳糖的半乳糖掺入66%乙醇可溶产物中的半乳糖基转移酶与所有膜级分相关。乙醇不溶产物在(鼠骨髓瘤蛋白J539)-琼脂糖凝胶上的亲和层析表明,负责合成含有(1→6)-β-D-半乳糖残基聚合物的酶仅与富含高尔基体衍生膜的亚细胞级分相关。这表明高尔基体在黑麦草阿拉伯半乳聚糖蛋白的碳水化合物成分合成中起重要作用。

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