Golgi nucleotide sugar transport and leukocyte adhesion deficiency II.

Golgi nucleotide sugar transport and leukocyte adhesion deficiency II.
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高尔基体核苷酸糖转运与白细胞粘附缺陷II.

DOI:
10.1172/jci13480
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发表时间:
2001
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Hirschberg,CB
Hirschberg,CB
中科院分区:
--
文献类型:
--
作者:
Hirschberg,CB

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高尔基体膜GDP-岩藻糖逆向转运蛋白的机制。GDP-岩藻糖在胞质溶胶中由GDP-甘露糖(可能是主要途径)或游离岩藻糖合成。然后,核苷酸糖通过GDP-岩藻糖转运蛋白转运到高尔基体的内腔中,在高尔基体中,特定的岩藻糖基转移酶将岩藻糖添加到各种糖蛋白和糖脂中。另一种反应产物GDP被内腔核苷二磷酸酶转化为GMP和无机磷酸盐。前者通过与GDP-岩藻糖转运偶联的反向转运机制输出到细胞质,而后者被认为通过特定通道GOLAC离开高尔基体腔(23)。岩藻糖基-T,岩藻糖基转移酶; Pi,无机磷酸盐。
Mechanism of the Golgi membrane GDP-fucose antiporter. GDP-fucose is synthesized in the cytosol from either GDP-mannose (probably the major pathway) or from free fucose. The nucleotide sugar is then transported via the GDP-fucose transporter into the lumen of the Golgi apparatus, where specific fucosyltransferases add fucose to a variety of glycoproteins and glycolipids. GDP, the other reaction product, is converted by a lumenal nucleoside diphosphatase to GMP and inorganic phosphate. The former is exported to the cytoplasm through an antiport mechanism that is coupled with GDP-fucose transport, whereas the latter is postulated to leave the Golgi lumen via a specific channel, GOLAC (23). Fucosyl-T, fucosyltransferases; Pi, inorganic phosphate.
UDP-半乳糖转运至高尔基腔调节蛋白聚糖的生物合成 (*)
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