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人类O-GlcNAc转移酶基质通过MALDI-TOF MS量化糖化的识别

Jun Bian¹, Yaqing Wang¹, Li Liu¹

¹Glycomics and Glycan Bioengineering Research Center (GGBRC)College of Food Science and Technology, Nanjing Agricultural University, 210095, China.

Carbohydrate research

|October 28, 2025

概括

人类O-GlcNAc转移酶 (hOGT) 基质识别规则是通过质谱和分子对接发现的. 这些发现为设计基质和设计O-GlcNAc测定提供了一个框架.

科学领域:

生物化学生物化学
分子生物学分子生物学
葡萄糖生物学葡萄糖生物学

背景情况:

人类O-GlcNAc转移酶 (hOGT) 催化了O-GlcNAc对蛋白质的添加,这是一个关键的翻译后修改.
对hOGT基质认可的预测规则仍然不完整,这阻碍了对其监管作用的充分理解.

研究的目的:

阐明人类O-GlcNAc转移酶 (hOGT) 的特定序和残留偏好.
建立hOGT基质识别的预测规则,并使基质工程成为可能.

主要方法:

使用MALDI-TOF MS来量化完整的O-GlcNAcylation.使用MALDI-TOF MS来量化完整的O-GlcNAcylation.使用MALDI-TOF MS来量化完整的O-GlcNAcylation.
采用基于转换的序列标志和分子对接来分析识别模式.
合成并测试了一组,以确定O-GlcNAcylation的效率.

主要成果:

对于高效的hOGT基质,确定了关键的残留偏好:PRO在-2/3度,Val/Ser在-1度,Ser在+1度和Ala在+2度.
观察到低效率和非基质的明显模式,包括Gly在-2/1和不利的+1/+2残留物.
证明了向的修改可以调整O-GlcNAcylation的反应性.

结论:

根据已识别的基质偏好,建立了基于O-GlcNAc测定的新设计规则.
为工程基提供了一个框架,具有量身定制的O-GlcNAcylation效率.
在分子层面上提高对hOGT基质识别机制的理解.

关键词:

糖甘的修改方法之一.葡萄糖的合成方法葡萄糖基转移酶是什么?质谱学量化量化的量化.立体选择性糖基化.

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