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
中科院分区:
文献类型:
--
作者:
Xiao;K. Nakayama;Y. Shimma;Atsushi Tanaka;Y. Jigami
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.
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DOI:
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发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Couso,R;Lang,L;Roberts,RM;Kornfeld,S
通讯作者:
Kornfeld,S
影响因子:
56.9
作者:
DESCOTEAUX, A;LUO, Y;BEVERLEY, SM
通讯作者:
BEVERLEY, SM
影响因子:
3.9
作者:
Carver,MA;Turco,SJ
通讯作者:
Turco,SJ
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