Functional and Structural Analysis of Phenazine <i>O</i>-Methyltransferase LaPhzM from <i>Lysobacter antibioticus</i> OH13 and One-Pot Enzymatic Synthesis of the Antibiotic Myxin
作者:Jiasong Jiang、Daisy Guiza Beltran、Andrew Schacht、Stephen Wright、Limei Zhang、Liangcheng Du
DOI:10.1021/acschembio.8b00062
日期:2018.4.20
dimethoxy formation in all phenazine compounds isolated from strain OH13. LaPhzM exhibits relaxed substrate selectivity, catalyzing O-methylation of phenazines with non-, mono-, or di-N-oxide. In addition, we demonstrated a one-pot biosynthesis of myxin by in vitro reconstitution of the three phenazine-ring decorating enzymes. Finally, we determined the X-ray crystal structure of LaPhzM with a bound cofactor
Myxin是一种已使用了数十年的著名抗生素。它属于具有各种生物活性的吩嗪天然产物,通常由杂芳族三环系统上的修饰基团决定。粘菌素的三个环带有许多装饰,包括不寻常的芳香族N 5,N 10-二氧化物。我们以前表明,吩嗪1,6-二羧酸(PDC)是粘菌素的直接前体,并且两种氧化还原酶(LaPhzS和LaPhzNO1)催化PDC的脱羧羟基化和芳香族N-氧化,从而产生碘(1.6-dihydroxy- N 5,N 10-二氧化吩嗪)。在这项工作中,我们确定了LaPhzM从基因溶血杆菌抗生素OH13,并证明LaPhzM编码将iodinin转化为粘菌素的SAM依赖性O-甲基转移酶。结果进一步表明,LaPhzM负责从菌株OH13分离的所有吩嗪化合物中的单甲氧基和二甲氧基的形成。LaPhzM具有轻松的底物选择性,可通过非,一或二-N氧化物催化吩嗪的O-甲基化。此外,我们证明了通过体外一锅法生物合成粘菌素的方法三种