木质素
化学
还原胺化
生物催化
胺气处理
解构(建筑)
木质纤维素生物量
羧酸
环境友好型
有机化学
胺化
生物量(生态学)
绿色化学
芳基
组合化学
催化作用
废物管理
反应机理
生物
生态学
烷基
工程类
农学
作者
Priyanka Nain,Roman M. Dickey,Vishal Somasundaram,Morgan Sulzbach,Aditya M. Kunjapur
标识
DOI:10.1101/2023.07.21.550087
摘要
Abstract The selective introduction of amine groups within deconstruction products of lignin could provide an avenue for valorizing waste biomass while achieving a green synthesis of industrially relevant building blocks from sustainable sources. Here, we built and characterized enzyme cascades that create aldehydes and subsequently primary amines from diverse lignin-derived carboxylic acids using a carboxylic acid reductase (CAR) and an ω-transaminase (TA). Unlike previous studies that have paired CAR and TA enzymes, here we examine multiple homologs of each of these enzymes and a broader set of candidate substrates. In addition, we compare the performance of these systems in cell-free and resting whole-cell biocatalysis formats using the conversion of vanillate to vanillyl amine as model chemistry. We also demonstrate that resting whole cells can be recycled for multiple batch reactions. We used the knowledge gained from this study to produce several amines from carboxylic acid precursors using one-pot biocatalytic reactions, several of which we report for the first time. These results expand our knowledge of these industrially relevant enzyme families to new substrates and contexts for environmentally friendly and potentially low-cost synthesis of diverse aryl aldehydes and amines.
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