NAD+激酶
还原酶
氧化还原酶
生物化学
辅因子
脯氨酸
酶
三元络合物
化学
异构酶
立体化学
脯氨酸脱氢酶
鸟氨酸转氨酶
生物
脱氢酶
氨基酸
精氨酸
鸟氨酸
作者
Zhen Meng,Zhiyong Lou,Zhe Liu,Ming Li,Xiaodong Zhao,Mark Bartlam,Zihe Rao
标识
DOI:10.1016/j.jmb.2006.04.053
摘要
Pyrroline-5-carboxylate reductase (P5CR) is a universal housekeeping enzyme that catalyzes the reduction of Δ1-pyrroline-5-carboxylate (P5C) to proline using NAD(P)H as the cofactor. The enzymatic cycle between P5C and proline is very important for the regulation of amino acid metabolism, intracellular redox potential, and apoptosis. Here, we present the 2.8 Å resolution structure of the P5CR apo enzyme, its 3.1 Å resolution ternary complex with NAD(P)H and substrate-analog. The refined structures demonstrate a decameric architecture with five homodimer subunits and ten catalytic sites arranged around a peripheral circular groove. Mutagenesis and kinetic studies reveal the pivotal roles of the dinucleotide-binding Rossmann motif and residue Glu221 in the human enzyme. Human P5CR is thermostable and the crystals were grown at 37 °C. The enzyme is implicated in oxidation of the anti-tumor drug thioproline.
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