含有增强芳香序列影响蛋白N-糖化效率的残留物
Yen-Wen Huang1,2, Hwai-I Yang1,3, Ying-Ta Wu1
1Genomics Research Center Academia Sinica , Taipei 115, Taiwan.
Journal of the American Chemical Society
|August 19, 2017
概括
这项研究揭示了特定的氨基酸序列如何影响N-糖化效率. 优化这些序列可以增强或抑制N-甘氨酸占用,帮助糖蛋白工程和理解酶机制.
科学领域:
- 生物化学
- 分子生物学
- 葡萄糖生物学
背景情况:
- N-糖化是一种关键的翻译后修饰,可以调节糖蛋白的功能.
- 已知的N-糖化序列包括Asn-X-Ser/Thr (NXS/T) 和增强的芳香序列.
- 了解序列要求是控制N-糖化过程的关键.
研究的目的:
- 调查侧面残留物对增强芳香序列中的N-糖化效率的影响.
- 确定相对于Asn的i-2,i-1,i+1和i+2位置的特定氨基酸偏好.
- 开发预测模型并优化N-糖化部位.
主要方法:
- 使用人类CD2粘附域 (hCD2ad) 对增强芳香序列的序列变异进行系统选.
- 基于侧面位置的残留物类型的N-糖化效率分析.
- 使用SAS软件和120个训练序列的预测算法的开发.
- 在其他糖蛋白和分子建模中对优化序列的实验验证.
主要成果:
- 在i-2位置的芳香和含硫的残留物增强N-糖化;Arg抑制它.
- 在i-1位置的Cys等残留物可以提高效率,并在i-2处抵消负面影响.
- 小的残留物和在i+1处的Ser,以及在i+2处的Thr,有利于N-糖化.
- 优化的序列增强了其他糖蛋白中的N-甘氨酸占用率,由OST相互作用建模支持.
结论:
- 特定的氨基酸残留在定义的位置显著调节N-糖化效率.
- 一个算法可以预测N-糖化效率,从而实现有针对性的修改.
- 这些发现为控制N-糖化和理解寡糖转移酶 (OST) 功能提供了洞察力.
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