Chemoenzymatic Assembly of Mammalian O-Mannose Glycans.

Chemoenzymatic Assembly of Mammalian O-Mannose Glycans.
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哺乳动物 O-甘露糖聚糖的化学酶组装

DOI:
10.1002/anie.201804373
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发表时间:
2018-07-16
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Cao H
Cao H
中科院分区:
其他
文献类型:
--
作者:
Meng C;Sasmal A;Zhang Y;Gao T;Liu CC;Khan N;Varki A;Wang F;Cao H

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O-甘露糖聚糖是一个高度异质的复杂聚糖家族,占大脑中总O-聚糖的30%。以前的合成和功能研究仅集中于α-肌营养不良蛋白聚糖的核心M3 O-甘露糖聚糖,其是各种肌肉疾病的致病因子。在这项研究中,开发了一种高效的化学酶策略,首次集体合成了63个核心M1和核心M2 O-甘露糖聚糖。该化学酶促策略的特征在于5个明智设计的核心结构的克级化学合成,以及用3个酶模块对核心结构进行多样性取向的修饰,以在不超过4个步骤的线性序列中提供58个复杂的O-甘露糖聚糖。值得注意的是,这些O-甘露糖聚糖中有55个是首次合成的。使用打印的O-甘露糖聚糖阵列,人脑蛋白CD 33,阿尔茨海默病的调节中的关键因素被鉴定为与唾液酸化的核心M1和核心M2强烈结合。
O-Mannose glycans, a family of highly heterogeneous complex glycans account up to 30% of total O-glycans in brain. Previous synthesis and functional studies only focused on the Core M3 O-mannose glycans of α-dystroglycan which are a causative factor for various muscular diseases. In this study, a highly efficient chemoenzymatic strategy was developed that enabled the first collective synthesis of 63 Core M1 and Core M2 O-mannose glycans. This chemoenzymatic strategy features the gram-scale chemical synthesis of 5 judiciously designed core structures, and the diversity-oriented modification of the core structures with 3 enzyme modules to provide 58 complex O-mannose glycans in a linear sequence that does not exceed 4 steps. Of note, 55 of these O-mannose glycans are synthesized for the first time. Using the printed O-mannose glycan array, the human brain protein CD33, a key factor in the modulation of Alzheimer’s disease was identified as strongly binding to sialylated Core M1 and Core M2.
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