The STT3 protein is a component of the yeast oligosaccharyltransferase complex

The STT3 protein is a component of the yeast oligosaccharyltransferase complex
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STT3 蛋白是酵母寡糖转移酶复合物的组成部分

DOI:
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发表时间:
1997
期刊:
Molecular and General Genetics MGG
影响因子:
--
通讯作者:
Markus Aebi
Markus Aebi
中科院分区:
--
文献类型:
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作者:
Urs Spirig;M. Glavaš;Daniel Bodmer;G. Reiss;P. Burda;V. Lippuner;S. Heesen;Markus Aebi

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摘要N-连接蛋白的糖基化是真核细胞中一个必不可少的过程。在中心反应中,寡糖基转移酶(OTase)催化焦磷酸二聚糖将低聚糖Glc3Man9GlcNAc2转移到内质网腔内新生多肽链上的天冬酰胺残基上。必需基因STT3的产物是体内OTase活性所必需的,但在高纯度的OTase制剂中不存在。通过对标记的Stt3蛋白的亲和纯化,我们现在证明了OTase复合体的其他成分,即Ost1p、Wbp1p和Swp1p,特异性地与Stt3蛋白共纯化。此外,不同的条件stt3等位基因可以被OST3和OST4的过度表达所抑制,OST3和OST4编码OTase复合体的小部分。这些遗传和生化数据表明,高度保守的Stt3p是寡糖转移酶复合体的一个组成部分。
Abstract N-linked protein glycosylation is an essential process in eukaryotic cells. In the central reaction, the oligosaccharyltransferase (OTase) catalyzes the transfer of the oligosaccharide Glc3Man9GlcNAc2 from dolicholpyrophosphate onto asparagine residues of nascent polypeptide chains in the lumen of the endoplasmic reticulum. The product of the essential gene STT3 is required for OTase activity in vivo, but is not present in highly purified OTase preparations. Using affinity purification of a tagged Stt3 protein, we now demonstrate that other components of the OTase complex, namely Ost1p, Wbp1p and Swp1p, specifically co-purify with the Stt3 protein. In addition, different conditional stt3 alleles can be suppressed by overexpression of either OST3 and OST4, which encode small components of the OTase complex. These genetic and biochemical data show that the highly conserved Stt3p is a component of the oligosaccharyltransferase complex.
DOI: 10.1146/annurev.ge.21.120187.001355
发表时间: 1987
影响因子: 11.1
作者:
T. Huffaker;M. Hoyt;D. Botstein
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DOI: --
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影响因子: --
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