磷酸葡萄糖酸脱氢酶 (脱羧)
外观
磷酸葡萄糖酸脱氢酶 (脱羧) | |||||||||
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识别码 | |||||||||
EC編號 | 1.1.1.44 | ||||||||
CAS号 | 9073-95-4 | ||||||||
数据库 | |||||||||
IntEnz | IntEnz浏览 | ||||||||
BRENDA | BRENDA入口 | ||||||||
ExPASy | NiceZyme浏览 | ||||||||
KEGG | KEGG入口 | ||||||||
MetaCyc | 代谢路径 | ||||||||
PRIAM | 概述 | ||||||||
PDB | RCSB PDB PDBj PDBe PDBsum | ||||||||
基因本体 | AmiGO / EGO | ||||||||
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磷酸葡萄糖酸脱氢酶 (脱羧)(英語:phosphogluconate dehydrogenase (decarboxylating),EC 1.1.1.44 (页面存档备份,存于互联网档案馆))是一种以NAD+或NADP+为受体、作用于供体CH-OH基团上的氧化还原酶。这种酶能催化以下酶促反应:
在上述反应中,6-磷酸葡萄糖酸首先被氧化为3-酮-6-磷酸葡萄糖酸,同时NADPH形成并被释放;然后,中间体被脱羧产生1,2-烯二醇式结构,最终互变异构化为核酮糖5-磷酸。[1] 高浓度的NADPH对这种酶的活性有抑制性,而6-磷酸葡萄糖酸则能激活这种酶。[2] 磷酸葡萄糖酸脱氢酶 (脱羧)主要参与核酮糖5-磷酸的产生,并为磷酸戊糖途径提供主要的NADPH。[3]
参考文献
[编辑]- ^ Chen YY, Ko TP, Chen WH, Lo LP, Lin CH, Wang AH. Conformational changes associated with cofactor/substrate binding of 6-phosphogluconate dehydrogenase from Escherichia coli and Klebsiella pneumoniae: Implications for enzyme mechanism. J Struct Biol. 2010, 169 (1): 25–35. PMID 19686854. doi:10.1016/j.jsb.2009.08.006.
- ^ Rippa M, Giovannini PP, Barrett MP, Dallocchio F, Hanau S. 6-Phosphogluconate dehydrogenase: the mechanism of action investigated by a comparison of the enzyme from different species. Biochim Biophys Acta. 1998, 1429 (1): 83–92. PMID 9920387. doi:10.1016/S0167-4838(98)00222-2.
- ^ He, W., Wang, Y., Liu, W. & Zhou, C.-Z. Crystal structure of Saccharomyces cerevisiae 6-phosphogluconate dehydrogenase Gnd1. BMC Struct. Biol. 2007,. 7, (38): 38. PMC 1919378 . PMID 17570834. doi:10.1186/1472-6807-7-38.
- DICKENS F, GLOCK GE. Direct oxidation of glucose-6-phosphate, 6-phosphogluconate and pentose-5-phosphates by enzymes of animal origin. Biochem. J. 1951, 50 (1): 81–95. PMC 1197610 . PMID 14904376.
- Bonsignore A and Horecker BL. Purification and properties of beta-L-hydroxy acid dehydrogenase II. Isolation of beta-keto-L-gluconic acid, an intermediate in L-xylulose biosynthesis. J. Biol. Chem. 1961, 236: 2975–2980.
- Scott DBM and Cohen SS. The oxidative pathway of carbohydrate metabolism in Escherichia coli. 1. The isolation and properties of glucose 6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase. Biochem. J. 1953, 55: 23–33.
- Scott DBM and Cohen SS. The oxidative pathway of carbohydrate metabolism in Escherichia coli. 5. Isolation and identification of ribulose phosphate produced from 6-phosphogluconate by the dehydrogenase of E. coli. Biochem. J. 1957, 65: 686–689.