Crystallographic Trapping of Reaction Intermediates in Quinolinic Acid Synthesis by NadA
作者:Anne Volbeda、Jaione Saez Cabodevilla、Claudine Darnault、Océane Gigarel、Thi-Hong-Lien Han、Oriane Renoux、Olivier Hamelin、Sandrine Ollagnier-de-Choudens、Patricia Amara、Juan C. Fontecilla-Camps
DOI:10.1021/acschembio.7b01104
日期:2018.5.18
dinucleotide (NAD(P)) cofactor. Using X-ray crystallography, we have (i) characterized two of the reaction intermediates of QA synthesis using a “pH-shift” approach and a slowly reacting Thermotoga maritima NadA variant and (ii) observed the QA product, resulting from the degradation of an intermediate analogue, bound close to the entrance of a long tunnel leading to the solvent medium. We have also used molecular
NadA是一种多功能酶,可使磷酸二羟基丙酮磷酸酯(DHAP)与亚氨基天冬氨酸(IA)缩合生成喹啉酸(QA),后者是烟酰胺腺嘌呤二核苷酸(NAD(P))辅助因子的通用前体。使用X射线晶体学,我们(i)使用“ pH偏移”方法和缓慢反应的马氏球菌NadA变体表征了QA合成的两种反应中间体,并且(ii)观察到由于QA降解而产生的QA产物。中间类似物,绑定在通向溶剂介质的长隧道的入口附近。我们还使用了分子对接技术,基于之前发表的两个火球菌,提出了DHAP和IA之间的缩合机理。NadA结构。报告数据和我们的新结果的结合提供了NadA进行QA合成的基于结构的完整催化序列。