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X-ray crystal structures of rabbit N-acetylglucosaminyltransferase I (GnT I) in complex with donor substrate analogues

机译:兔N-乙酰氨基葡萄糖氨基转移酶I(GnT I)与供体底物类似物复合的X射线晶体结构

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摘要

The Golgi-resident glycosyltransferase, UDP-N-acetyl-D-glucosamine:alpha-3-D-mannoside beta-1,2-N-acetylglucosaminyltransferase I (GnT I), initiates the conversion of high-mannose oligosaccharides to complex and hybrid structures in the biosynthesis of N-linked glycans. Reported here are the X-ray crystal structures of GnT I in complex with UDP-CH2-GIcNAc (a non-hydrolyzable C-glycosidic phosphonate), UDP-2-deoxy-2-fluoro-glucose, UDP-glucose and UDP. Collectively, these structures provide evidence for the importance of the GlcNAc moiety and its N-acetyl group in donor substrate binding, as well as insight into the role played by the flexible 318-330 loop in substrate binding and product release. In addition, the UDP-CH2-GlcNAc complex reveals a well-defined glycerol molecule poised for nucleophilic attack on the C1 atom of the donor substrate analogue. The position and orientation of this glycerol molecule have allowed us to model the binding of the Man alpha 1, 3Man beta 1 moiety of the acceptor substrate and, based on the model, to suggest a rationalization for the main determinants of GnT I acceptor specificity. (c) 2006 Elsevier Ltd. All rights reserved.
机译:高尔基驻留的糖基转移酶UDP-N-乙酰基-D-葡糖胺:α-3-D-甘露糖苷β-1,2-N-乙酰基氨基葡萄糖氨基转移酶I(GnT I)引发高甘露糖寡糖向复杂和杂种的转化N-连接聚糖的生物合成中的结构。此处报道的是GnT I的X射线晶体结构,该结构与UDP-CH2-GIcNAc(不可水解的C-糖苷膦酸酯),UDP-2-脱氧-2-氟葡萄糖,UDP-葡萄糖和UDP复合。这些结构共同为GlcNAc部分及其N-乙酰基在供体底物结合中的重要性提供了证据,并深入了解了柔性318-330环在底物结合和产物释放中所起的作用。另外,UDP-CH2-GlcNAc复合物揭示了一个明确定义的甘油分子,准备对供体底物类似物的C1原子进行亲核攻击。此甘油分子的位置和方向使我们能够建模受体底物的Man alpha 1、3Man beta 1部分的结合,并基于该模型为GnT I受体特异性的主要决定因素提出合理化建议。 (c)2006 Elsevier Ltd.保留所有权利。

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