Use of the dehydrophos biosynthetic enzymes to prepare antimicrobial analogs of alaphosphin
作者:Despina J. Bougioukou、Chi P. Ting、Spencer C. Peck、Subha Mukherjee、Wilfred A. van der Donk
DOI:10.1039/c8ob02860e
日期:——
enzyme is also tolerant with respect to the aminoacid attached to tRNALeu. Using a mutant of leucyl tRNA synthetase that is deficient in its proofreading ability allowed the preparation of a series of aminoacyl-tRNALeu derivatives (Ile, Ala, Val, Met, norvaline, and norleucine). DhpH-C accepted these aminoacyl-tRNA derivatives and condensed the aminoacid with l-Ala(P) to form the corresponding phosphonodipeptides
was accomplished by using a commercially available Noyori-type catalyst. The highly enantioenriched products (ee >98 % in all cases but one) were further converted to the phosphonic acidanalogs of 15 aminocarboxylic acids. The established method can also be used for the asymmetric transfer deuteration (ATD) of the starting α-oxo-phosphonates.
Crystal structure of PhnZ in complex with substrate reveals a di-iron oxygenase mechanism for catabolism of organophosphonates
作者:Laura M. van Staalduinen、Fern R. McSorley、Katharina Schiessl、Jacqueline Séguin、Peter B. Wyatt、Friedrich Hammerschmidt、David L. Zechel、Zongchao Jia
DOI:10.1073/pnas.1320039111
日期:2014.4.8
coordinated by four histidines and two aspartates that is strikingly similar to the carbon-carbonbond cleaving enzyme, myo-inositol-oxygenase. The exception is Y24, which forms a transient ligand interaction at the dioxygen binding site of Fe2. Site-directed mutagenesis and kinetic analysis with substrate analogs revealed the roles of key active site residues. A fifth histidine that is conserved in the PhnZ
PhnY 和 PhnZ 酶包含氧化分解代谢途径,使海洋细菌能够使用 2-氨基乙基膦酸作为无机磷酸盐的来源。PhnZ 以使用 Fe(II) 和双氧催化碳-磷键的氧化裂解而著称,尽管它属于水解酶的一个大家族,即 HD-磷酸水解酶超家族。我们已经确定了与其底物 (R)-2-amino-1-hydroxyethylphosphonate (2.1 A) 和缓冲添加剂 l-酒石酸盐 (1.7 A) 结合的 PhnZ 的高分辨率结构。这些结构表明 PhnZ 具有一个活性位点,其中包含由四个组氨酸和两个天冬氨酸配位的两个 Fe 离子,与碳-碳键裂解酶肌肉肌醇加氧酶极为相似。Y24 是个例外,它在 Fe2 的双氧结合位点形成瞬时配体相互作用。用底物类似物进行定点诱变和动力学分析揭示了关键活性位点残基的作用。第五个组氨酸在 PhnZ 亚分支中保守,H62,专门与底物 1-羟基相互作用。这些结构还表明,Y24
Reaction of HppE with Substrate Analogues: Evidence for Carbon–Phosphorus Bond Cleavage by a Carbocation Rearrangement
作者:Wei-chen Chang、Steven O. Mansoorabadi、Hung-wen Liu
DOI:10.1021/ja403441x
日期:2013.6.5
(S)-2-hydroxypropylphosphonic acid ((S)-2-HPP) epoxidase (HppE) is an unusual mononuclear non-heme iron enzyme that catalyzes the oxidative epoxidation of (S)-2-HPP in the biosynthesis of the antibiotic fosfomycin. Recently, HppE has been shown to accept (R)-1-hydroxypropylphosphonic acid as a substrate and convert it to an aldehyde product in a reaction involving a biologically unprecedented 1,2-phosphono