HCF-1 is cleaved in the active site of O-GlcNAc transferase.

HCF-1 is cleaved in the active site of O-GlcNAc transferase.
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DOI:
10.1126/science.1243990
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发表时间:
2013-12-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Walker S
Walker S
中科院分区:
其他
文献类型:
--
作者:
Lazarus MB;Jiang J;Kapuria V;Bhuiyan T;Janetzko J;Zandberg WF;Vocadlo DJ;Herr W;Walker S

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宿主细胞因子-1(HCF-1)是人类细胞周期进程的转录辅助调节因子,经历蛋白水解性成熟,其中六个重复序列中的任何一个被营养响应糖基转移酶O-连接N-乙酰氨基葡萄糖(O-GlcNAc)转移酶(OGT)切割。我们报道了O-GlcNAc转移酶的四肽重复结构域与HCF-1蛋白水解性重复序列的C-末端部分结合,从而使切割区域位于UDP-GlcNAc上方的糖基转移酶活性部位。该构象类似于糖基化活性多肽底物。半胱氨酸和谷氨酸残基之间发生裂解,生成焦谷氨酸产物。裂解位点谷氨酸转化为丝氨酸,将HCF-1蛋白水解性重复序列转化为糖基化底物。因此,蛋白质糖基化和HCF-1裂解发生在同一活性部位。
Host Cell Factor-1 (HCF-1), a transcriptional co-regulator of human cell-cycle progression, undergoes proteolytic maturation in which any of six repeated sequences is cleaved by the nutrient-responsive glycosyltransferase, O-linked N-acetylglucosamine (O-GlcNAc) transferase (OGT). We report that the tetratricopeptide-repeat domain of O-GlcNAc transferase binds the C-terminal portion of an HCF-1 proteolytic repeat such that the cleavage region lies in the glycosyltransferase active site above UDP-GlcNAc. The conformation is similar to that of a glycosylation-competent peptide substrate. Cleavage occurs between cysteine and glutamate residues and results in a pyroglutamate product. Conversion of the cleavage site glutamate into serine converts an HCF-1 proteolytic repeat into a glycosylation substrate. Thus, protein glycosylation and HCF-1 cleavage occur in the same active site.
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