Shedding of glycan‐modifying enzymes by signal peptide peptidase‐like 3 (SPPL3) regulates cellular N‐glycosylation

Shedding of glycan‐modifying enzymes by signal peptide peptidase‐like 3 (SPPL3) regulates cellular N‐glycosylation
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信号肽肽酶样 3 (SPPL3) 释放聚糖修饰酶可调节细胞 N-糖基化

DOI:
10.15252/embj.201488375
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发表时间:
2014
期刊:
The EMBO Journal
影响因子:
--
通讯作者:
Regina Fluhrer
Regina Fluhrer
中科院分区:
--
文献类型:
--
作者:
M. Voss;U. Künzel;Fabian Higel;Peer;A. Colombo;Akio Fukumori;Martina Haug;Bärbel Klier;Gudula Grammer;Andreas Seidl;B. Schröder;R. Obst;H. Steiner;S. Lichtenthaler;C. Haass;Regina Fluhrer

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蛋白质N-糖基化参与多种生理和病理生理过程,例如自身免疫、肿瘤进展和转移。信号肽类肽酶 3 (SPPL3) 是一种 GxGD 型膜内切割天冬氨酰蛋白酶。然而,其生理功能仍然是个谜,因为目前尚未鉴定出生理底物。我们证明 SPPL3 通过触发含有活性位点的糖苷酶和糖基转移酶胞外域的蛋白水解释放来改变细胞 N-糖基化模式,例如 N-乙酰葡糖胺基转移酶 V、β-1,3 N-乙酰葡糖胺基转移酶 1 和 β-1,4 半乳糖基转移酶 1。这些酶的裂解导致其细胞活性降低。与此一致的是,SPPL3 表达减少会导致糖基化过度表型,而 SPPL3 表达升高则会导致糖基化不足。因此,SPPL3 在真核生物进化高度保守的翻译后过程中发挥着核心作用。
Protein N‐glycosylation is involved in a variety of physiological and pathophysiological processes such as autoimmunity, tumour progression and metastasis. Signal peptide peptidase‐like 3 (SPPL3) is an intramembrane‐cleaving aspartyl protease of the GxGD type. Its physiological function, however, has remained enigmatic, since presently no physiological substrates have been identified. We demonstrate that SPPL3 alters the pattern of cellular N‐glycosylation by triggering the proteolytic release of active site‐containing ectodomains of glycosidases and glycosyltransferases such as N‐acetylglucosaminyltransferase V, β‐1,3 N‐acetylglucosaminyltransferase 1 and β‐1,4 galactosyltransferase 1. Cleavage of these enzymes leads to a reduction in their cellular activity. In line with that, reduced expression of SPPL3 results in a hyperglycosylation phenotype, whereas elevated SPPL3 expression causes hypoglycosylation. Thus, SPPL3 plays a central role in an evolutionary highly conserved post‐translational process in eukaryotes.
DOI: 10.1074/jbc.m112.371369
发表时间: 2012-11
期刊: The Journal of Biological Chemistry
影响因子: --
作者:
M. Voss;Akio Fukumori;Peer-Hendrik Kuhn;U. Künzel;Bärbel Klier;Gudula Grammer;Martina Haug-Kröper;E. Kremmer;S. Lichtenthaler;H. Steiner;B. Schröder;C. Haass;Regina Fluhrer
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