MNN6, a Member of the KRE2/MNT1 Family, Is the Gene for Mannosylphosphate Transfer in Saccharomyces cerevisiae *

MNN6, a Member of the KRE2/MNT1 Family, Is the Gene for Mannosylphosphate Transfer in Saccharomyces cerevisiae *
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MNN6 是 KRE2/MNT1 家族的成员,是酿酒酵母中甘露糖基磷酸转移的基因 *

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
Y. Jigami
Y. Jigami
中科院分区:
生物学2区
文献类型:
--
作者:
Xiao;K. Nakayama;Y. Shimma;Atsushi Tanaka;Y. Jigami

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在酿酒酵母中,N-连接的糖链通过添加甘露糖磷酸在不同位置进行修饰。mnn 6突变体缺乏对甘露四糖的甘露糖基磷酸转移酶活性(Karson,E. M.,和C. tagu,C. E.(1978)J.Biol.Chem.253,6484-6492)。我们通过互补法克隆了MNN 6基因。它编码一个446个氨基酸的多肽,具有II型膜蛋白的特征。推测的Mnn 6p与参与O-糖基化的高尔基体α-1,2-甘露糖基转移酶Kre 2 p/Mnt 1 p具有显著的相似性。MNN 6的无效突变体在体外表现出正常的细胞生长、与阿辛蓝的结合减少、对Calcoflour白色和潮霉素B的超敏反应以及对内质网核心寡糖受体(Man 8 GlcNAc 2-PA和Man 5 GlcNAc 2-PA)的甘露糖磷酸转移酶活性降低,表明MNN 6基因参与内质网核心寡糖磷酸化。然而,在Δ och 1 Δ mnn 1 Δ mnn 6细胞和Δ och 1 Δ mnn 1 Δ mnn 6细胞中没有观察到N-连接甘露糖蛋白寡糖的差异,表明存在核心寡糖磷酸化所需的冗余基因。基于MNN 6基因破坏后多聚甘露糖外链磷酸化的显著减少和受体中甘露糖磷酸化位点的确定,推测MNN 6基因可能是编码甘露糖磷酸转移酶的结构基因,该酶识别至少有一个α-1,2-连接甘露二糖单元的任何寡糖。
In yeast Saccharomyces cerevisiae theN-linked sugar chain is modified at different positions by the addition of mannosylphosphate. The mnn6 mutant is deficient in the mannosylphosphate transferase activity toward mannotetraose (Karson, E. M., and Ballou, C. E. (1978) J. Biol. Chem. 253, 6484–6492). We have cloned the MNN6gene by complementation. It has encoded a 446-amino acid polypeptide with the characteristics of type II membrane protein. The deduced Mnn6p showed a significant similarity to Kre2p/Mnt1p, a Golgi α-1,2-mannosyltransferase involved in O-glycosylation. The null mutant of MNN6 showed a normal cell growth, less binding to Alcian blue, hypersensitivity to Calcoflour White and hygromycin B, and diminished mannosylphosphate transferase activity toward the endoplasmic reticulum core oligosaccharide acceptors (Man8GlcNAc2-PA and Man5GlcNAc2-PA) in vitro, suggesting the involvement of the MNN6 gene in the endoplasmic reticulum core oligosaccharide phosphorylation. However, no differences were observed in N-linked mannoprotein oligosaccharides between Δoch1 Δmnn1 cells andΔoch1Δmnn1Δmnn6 cells, indicating the existence of redundant genes required for the core oligosaccharide phosphorylation. Based on a dramatic decrease in polymannose outer chain phosphorylation by MNN6 gene disruption and a determination of the mannosylphosphorylation site in the acceptor, it is postulated that theMNN6 gene may be a structural gene encoding a mannosylphosphate transferase, which recognizes any oligosaccharides with at least one α-1,2-linked mannobiose unit.
子宫铁蛋白寡糖被来自大鼠肝脏、卡氏棘阿米巴和盘基网柄菌的 UDP-GlcNAc:糖蛋白 N-乙酰氨基葡萄糖-1-磷酸转移酶磷酸化需要 α 1,2-连接的甘露糖残基。
DOI: --
发表时间: 1986
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影响因子: --
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DOI: 10.1126/science.7569927
发表时间: 1995-09-29
期刊: SCIENCE
影响因子: 56.9
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杜氏利什曼原虫脂磷酸聚糖的生物合成:体外甘露糖基磷酸转移的表征。
DOI: 10.1016/0003-9861(92)90523-y
发表时间: 1992
影响因子: 3.9
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来自酿酒酵母 mnn9 和 mnn10 突变体的磷酸化 N-连接寡糖的结构。
DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Hernandez,LM;Ballou,L;Alvarado,E;Tsai,PK;Ballou,CE
通讯作者: Ballou,CE
DOI: 10.1073/pnas.89.15.6846
发表时间: 1992-08-01
影响因子: 11.1
作者:
HAUSLER, A;BALLOU, L;ROBBINS, PW
通讯作者: ROBBINS, PW