Glycosylation events in the processing and secretion of pro-ACTH-endorphin in mouse pituitary tumor cells.

Glycosylation events in the processing and secretion of pro-ACTH-endorphin in mouse pituitary tumor cells.
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小鼠垂体肿瘤细胞中促肾上腺皮质激素原内啡肽加工和分泌中的糖基化事件。

DOI:
10.1021/bi00509a040
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Herbert,E
Herbert,E
中科院分区:
生物学3区
文献类型:
--
作者:
Phillips,MA;Budarf,ML;Herbert,E

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Marjorie A. Phillips,* Marcia L. Budarf, § 和 Edward Herbert* 摘要:在小鼠垂体肿瘤细胞系 (AtT-20/D16v) 中,通过用 β-la 标记的糖和氨基酸进行脉冲标记,然后进行免疫沉淀和十二烷基硫酸钠平板凝胶电泳,研究了促肾上腺皮质激素原 (ACTH) 内啡肽及其裂解产物的糖基化。该分析的结果表明,细胞内促肾上腺皮质激素原内啡肽有两种主要种类(29K 和 32K)和两种次要种类(30K 和 34K)。所有这些物种都用[3H]甘露糖、[3H]葡萄糖胺和[3H]半乳糖标记。此外,30K和34K物种用[3H]岩藻糖标记,是促肾上腺皮质激素原内啡肽的主要分泌形式。在 [35S] 蛋氨酸短脉冲后仅标记 29K 和 32K 形式。 30K 和 34K 形式在随后的追踪过程中被标记。来自促肾上腺皮质激素原内啡肽的链霉蛋白酶糖肽的糖苷酶消化显示29K和32K形式含有高甘露糖型寡糖。 30K 和 34K 形式含有复合低聚糖,具有核心糖和分支糖。这些结果
Marjorie A. Phillips,* Marcia L. Budarf, § and Edward Herbert* abstract: The glycosylation of pro-ACTH-endorphin and of its cleavage products has been studied in a mouse pituitary tumor cell line (AtT-20/D16v) by pulse labeling with^-la-beled sugars and amino acids followed by immunoprecipitation and sodium dodecyl sulfate slab gel electrophoresis. The results of this analysis indicate that there are two major intracellular species of pro-ACTH-endorphin (29K and 32K) and two minor species (30K and 34K). All of these species label with [3H] mannose,[3H] glucosamine, and [3H] galactose. In ad-dition, the 30K and 34K species label with [3H] fucose and are the major secreted forms of pro-ACTH-endorphin. Only the 29K and 32K forms are labeled after a short pulse with [35S] methionine. The 30K and 34K forms become labeled during a subsequent chase. Glycosidase digestion of Pronase glycopeptides derived from pro-ACTH-endorphin shows that the 29K and 32K forms contain high mannose type oligo-saccharides. The30K and 34K forms contain complex oli-gosaccharides with both core and branch sugars. These results
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