UGDH(UDP-glucose 6-dehydrogenase,尿苷二磷酸葡萄糖6-脱氢酶)是一种关键代谢酶,负责催化UDP-葡萄糖(UDP-glucose)氧化为UDP-葡糖醛酸(UDP-glucuronic acid),这是糖胺聚糖(如透明质酸、硫酸软骨素)和糖脂合成的重要前体。UGDH的生物学功能集中在细胞外基质(ECM)的构建、细胞信号传导及解毒过程中(如肝脏中药物与葡糖醛酸结合后排出)。其主要作用位点是细胞质,尤其在活跃合成ECM的细胞(如成纤维细胞、软骨细胞)中高表达。UGDH属于短链脱氢酶/还原酶(SDR)超家族,该家族共性为依赖NAD+/NADP+辅酶催化氧化还原反应,结构上具有保守的Rossmann折叠(一种蛋白质结构模体,用于结合辅酶)。UGDH突变可能导致酶活性丧失或异常,影响ECM合成,与骨关节炎、肿瘤转移(如透明质酸过度积累促进癌侵袭)及某些遗传性结缔组织病相关。过表达UGDH会提高UDP-葡糖醛酸产量,导致ECM过度沉积(如纤维化或肿瘤微环境硬化),同时可能干扰Wnt/β-catenin等依赖ECM的信号通路;而表达降低则削弱ECM修复能力,引发关节退化或伤口愈合延迟。UGDH还通过影响生长因子(如TGF-β)的活性间接调控其他基因(如胶原基因COL1A1)。其表达受转录因子HIF-1α(缺氧诱导因子)和炎症因子(如IL-1β)调控,在缺氧或炎症状态下表达可能异常。
The protein encoded by this gene converts UDP-glucose to UDP-glucuronate and thereby participates in the biosynthesis of glycosaminoglycans such as hyaluronan, chondroitin sulfate, and heparan sulfate. These glycosylated compounds are common components of the extracellular matrix and likely play roles in signal transduction, cell migration, and cancer growth and metastasis. The expression of this gene is up-regulated by transforming growth factor beta and down-regulated by hypoxia. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]
由该基因编码的蛋白质UDP-葡萄糖转换为UDP葡糖醛,并由此在糖胺聚糖诸如透明质酸,硫酸软骨素,和硫酸乙酰肝素的生物合成参与。这些糖基化的化合物是细胞外基质的共同的部件和信号转导,细胞迁移和癌的生长和转移可能发挥的作用。该基因的表达是由转化生长因子β和下调缺氧上调。选择性剪接结果在多个抄本变形。[由RefSeq的,2010年5月提供]
UGDH基因(以及对应的蛋白质)的细胞分布位置:
UGDH基因的本体(GO)信息:
名称 |
---|
40 Pentose and glucuronate interconversions [PATH:hsa00040] |
53 Ascorbate and aldarate metabolism [PATH:hsa00053] |
500 Starch and sucrose metabolism [PATH:hsa00500] |
520 Amino sugar and nucleotide sugar metabolism [PATH:hsa00520] |
名称 |
---|
Biological oxidations |
Formation of the active cofactor, UDP-glucuronate |
Glucuronidation |
Phase II conjugation |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
Liver neoplasms | 0.12 | 1 | 0 | CTD_human |
Alcoholic Intoxication, Chronic | 0.002367032 | 1 | 0 | GAD |
Giardiasis | 0.001085767 | 4 | 0 | BeFree |
Coinfection | 0.000542884 | 2 | 0 | BeFree |
Hyperinsulinism | 0.000542884 | 2 | 0 | BeFree |
Cyst | 0.000542884 | 2 | 0 | BeFree |
orbit (eye disorders) | 0.000271442 | 1 | 0 | BeFree |
Hypoglycemia | 0.000271442 | 1 | 0 | BeFree |
Cooley's anemia | 0.000271442 | 1 | 0 | BeFree |
Clostridium difficile infection | 0.000271442 | 1 | 0 | BeFree |
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