New insight into the pyruvate decarboxylase-catalysed formation of lactaldehyde from H–D exchange experiments: a ‘water proof’ active site
摘要:
Pyruvate decarboxylase from Saccharomyces cerevisiae catalyses the formation of lactaldehyde from sodium glyoxylate and acetaldehyde. By using deuteriated sodium glyoxylate (sodium [2-H-2] glyoxylate monohydrate) as a substrate it was verified that the lactaldehyde formed retains the deuterium atom. The implications of the observed result for the enzyme mechanism are discussed in the light of conclusions derived from recent molecular modelling studies.
A new synthesis of vinylphosphonium salts. Application for deuterium labeling
作者:Chantal Larpent、Henri Patin
DOI:10.1016/s0040-4039(00)80551-1
日期:1988.1
Nucleophilic additions of water-soluble phosphines on α-alcynic acids afford new vinylphosphonium salts which are easily transformed into specifically deuteriated olefins or phosphine oxides by using sequentially H2O or D2O.
On the reported intermediacy of vinyl radicals in spontaneous polymerization: An ESR-spin trapping study and its significance for the bond forming initiation theory
作者:Eugene A. Mash、Hans-Gert Korth、Suzanne M. DeMoss
DOI:10.1016/s0040-4020(97)00964-2
日期:1997.11
Deuterated isopropyl vinyl sulfides and diethyl fumarate were synthesized and employed in a re-investigation of the mechanism of initiation of spontaneous polymerization of these comonomers by means of spin-trapping/ESR spectroscopy. Previous radical spin-trapping studies had been interpreted as indicating the involvement of vinyl radicals. While our studies produced data substantially in agreement
Synthesis of (2S)-O-phosphohomoserine and its C-2 deuteriated and C-3 chirally deuteriated isotopomers: probes for the pyridoxal phosphate-dependent threonine synthase reaction
作者:Fiona Barclay、Ewan Chrystal、David Gani
DOI:10.1039/p19960000683
日期:——
A short efficient synthesis of the threonine synthase substrate (2S)-O-phosphohomoserine and its C-2 deuteriated and C-3 chirally deuteriated isotopomers is described. The synthetic route also provides access to (2S)-homoserine and its C-2 deuteriated and C-3 chirally deuteriated isotopomers in high yield. Preliminary deuterium isotope effect determinations performed using the deuteriated (2S)-O-phosphohomoserines and threonine synthase from E. coli indicate that the removal of protons from both C-2 and C-3 is kinetically important.
Stereochemical Course of the Reaction Catalyzed by RimO, a Radical SAM Methylthiotransferase
作者:Bradley J. Landgraf、Squire J. Booker
DOI:10.1021/jacs.5b11035
日期:2016.3.9
mimics of the S12 protein bearing deuterium at the 3 pro-R or 3 pro-S positions of the target aspartyl residue, we show that RimO from Bacteroides thetaiotaomicron (Bt) catalyzes abstraction of the pro-S hydrogenatom, as evidenced by the transfer of deuterium into 5'-deoxyadenosine (5'-dAH). The observed kineticisotopeeffect on H atom versus D atomabstraction is ∼1.9, suggesting that this step
Copper-Linked Rotaxanes for the Building of Photoresponsive Metal Organic Frameworks with Controlled Cargo Delivery
作者:Adrian Saura-Sanmartin、Alberto Martinez-Cuezva、Delia Bautista、Mara R. B. Marzari、Marcos A. P. Martins、Mateo Alajarin、Jose Berna
DOI:10.1021/jacs.0c04477
日期:2020.8.5
We have prepared a photoresponsive metal-organic framework by using an amide-based [2]rotaxane as linker and copper(II) ions as metal nodes. The interlocked linker was obtained by the hydrogen bond-directed approach employing a fumaramide thread as template of the macrocyclic component, this latter incorporating two carboxyl groups. Single crystal X-ray diffraction analysis of the metal-organic framework
我们通过使用基于酰胺的 [2] 轮烷作为接头和铜 (II) 离子作为金属节点制备了光响应金属有机框架。互锁接头是通过氢键定向方法获得的,采用富马酰胺线作为大环组分的模板,后者结合了两个羧基。在溶剂热条件下制备的金属-有机骨架的单晶 X 射线衍射分析表明,堆叠的 2D 菱面体网格的形成形成了用互锁链烯基线装饰的通道。一系列 E/Z 烯烃比不同的金属-有机骨架通过连接体的先前异构化或通过网状材料的后辐照制备。通过动态固态 2H NMR 测量,使用氘标记材料,我们证明,由于组分间非共价相互作用的强度,互锁支柱烯烃轴的几何形状决定了具有不同独立局部动力学的材料的获得。此外,还通过对苯醌在不同溶剂和温度下的扩散和光释放来测定这些新型铜-轮烷材料作为分子计量容器的有用性。