Metabolic Inhibitors of O-GlcNAc Transferase That Act In Vivo Implicate Decreased O-GlcNAc Levels in Leptin-Mediated Nutrient Sensing
作者:Tai-Wei Liu、Wesley F. Zandberg、Tracey M. Gloster、Lehua Deng、Kelsey D. Murray、Xiaoyang Shan、David J. Vocadlo
DOI:10.1002/anie.201803254
日期:2018.6.25
de‐N‐acetylase (NAGA), to generate a common OGT inhibitor within cells. We show that of these inhibitors, 2‐deoxy‐2‐N‐hexanamide‐5‐thio‐d‐glucopyranoside (5SGlcNHex) acts in vivo to induce dose‐ and time‐dependent decreases in O‐GlcNAc levels in various tissues. Decreased O‐GlcNAc correlates, both in vitro within adipocytes and in vivo within mice, with lower levels of the transcription factor Sp1 and the
O-GlcNAc转移酶(OGT)催化核苷蛋白的丝氨酸和苏氨酸残基与N-乙酰氨基葡萄糖(O-GlcNAc)残基的O-连锁糖基化。O-GlcNAc在哺乳动物中是保守的,与多种生理过程有关。在本文中,我们描述了适用于细胞和小鼠体内的OGT的代谢前体抑制剂。这些N-乙酰氨基葡萄糖的5-巯基糖类似物通过会聚的代谢途径被同化,最有可能涉及N-乙酰氨基葡萄糖-6-磷酸脱N-乙酰基酶(NAGA),从而在细胞内产生常见的OGT抑制剂。我们表明,这些抑制剂,2-脱氧-2-N-己酰胺基-5-硫代d吡喃吡喃糖苷(5SGlcNHex)在体内可引起各种组织中O-GlcNAc水平的剂量和时间依赖性降低。降低的O-GlcNAc在脂肪细胞内和小鼠体内与转录因子Sp1和饱腹感激素瘦素的水平降低相关,从而揭示了O-GlcNAc降低与周围组织营养感应之间的联系哺乳动物。