PDHA1(丙酮酸脱氢酶E1α亚基)基因位于X染色体(Xp22.12),编码丙酮酸脱氢酶复合体(PDC)的关键组分,负责将丙酮酸转化为乙酰辅酶A,连接糖酵解与三羧酸循环(TCA循环),是细胞能量代谢的核心酶。其表达产物为PDHA1蛋白,与PDHB(E1β亚基)共同形成E1组分,依赖硫胺素焦磷酸(TPP)催化丙酮酸脱羧。PDHA1的活性受磷酸化调控(PDK激酶抑制,PDP磷酸酶激活),主要在线粒体基质发挥作用。突变(如R263H、R349C)会导致PDHA1缺乏症,表现为乳酸酸中毒、神经退行性变(Leigh综合征样症状)及发育迟缓,属于X连锁遗传病。该基因过表达可能增强糖代谢流但罕见报道,而表达降低或功能缺失会阻断丙酮酸氧化,迫使细胞依赖无氧糖酵解(类似Warburg效应),影响ATP生成并累积乳酸。PDHA1属于丙酮酸脱氢酶复合体基因家族,该家族还包括PDHB、DLAT(E2)、DLD(E3)等,共同构成多酶复合体,其共性是通过协同作用完成丙酮酸氧化脱羧。PDHA1还与癌症相关(某些肿瘤中表达下调),并可能通过代谢重编程影响免疫细胞功能(如T细胞活化)。
The pyruvate dehydrogenase (PDH) complex is a nuclear-encoded mitochondrial multienzyme complex that catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2), and provides the primary link between glycolysis and the tricarboxylic acid (TCA) cycle. The PDH complex is composed of multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3). The E1 enzyme is a heterotetramer of two alpha and two beta subunits. This gene encodes the E1 alpha 1 subunit containing the E1 active site, and plays a key role in the function of the PDH complex. Mutations in this gene are associated with pyruvate dehydrogenase E1-alpha deficiency and X-linked Leigh syndrome. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2010]
的丙酮酸脱氢酶(PDH)复合物是核编码的线粒体多酶复合催化丙酮酸的总转化为乙酰-CoA和CO(2),并提供了糖酵解和三羧酸(TCA)之间的主链路周期。 PDH复合物是由三个酶组分的多个拷贝:丙酮酸脱氢酶(E1),二氢硫辛酰胺乙酰转移酶(E2)和硫辛酰胺脱氢酶(E3)。将E1酶是两个α和两个β亚基的异四聚体。该基因编码含有E1的活性部位的E1的α1亚单位,并播放在PDH复合物的功能的关键的作用。在这种基因突变与丙酮酸脱氢酶的E1-α缺乏和X-连锁Leigh综合征有关。另外剪接转录变体编码不同亚型也发现了这种基因。[由RefSeq的,2010年3月提供]
PDHA1基因(以及对应的蛋白质)的细胞分布位置:
PDHA1基因的本体(GO)信息:
| 名称 |
|---|
| 1200 Carbon metabolism [PATH:hsa01200] |
| 10 Glycolysis / Gluconeogenesis [PATH:hsa00010] |
| 20 Citrate cycle (TCA cycle) [PATH:hsa00020] |
| 620 Pyruvate metabolism [PATH:hsa00620] |
| 4066 HIF-1 signaling pathway [PATH:hsa04066] |
| 4922 Glucagon signaling pathway [PATH:hsa04922] |
| 5230 Central carbon metabolism in cancer [PATH:hsa05230] |
| 名称 |
|---|
| Pyruvate metabolism |
| Pyruvate metabolism and Citric Acid (TCA) cycle |
| Regulation of pyruvate dehydrogenase (PDH) complex |
| Signaling by Retinoic Acid |
| The citric acid (TCA) cycle and respiratory electron transport |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Pyruvate Dehydrogenase E1 Alpha Deficiency | 0.24 | 11 | 2 | ORPHANET_UNIPROT |
| Pyruvate Dehydrogenase Complex Deficiency Disease | 0.124071628 | 16 | 0 | BeFree_CTD_human |
| Acidosis, Lactic | 0.120814326 | 4 | 0 | BeFree_CTD_human |
| Pyruvate Metabolism, Inborn Errors | 0.12 | 1 | 0 | CTD_human |
| Stomach Neoplasms | 0.12 | 1 | 0 | CTD_human |
| Degenerative polyarthritis | 0.12 | 1 | 0 | CTD_human |
| Disease Progression | 0.12 | 1 | 0 | CTD_human |
| Myocardial Ischemia | 0.12 | 1 | 0 | CTD_human |
| Prostatic Neoplasms | 0.12 | 1 | 0 | CTD_human |
| Ataxia | 0.000542884 | 2 | 0 | BeFree |
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