作者:Gabriel M Rodriguez、Yohei Tashiro、Shota Atsumi
DOI:10.1038/nchembio.1476
日期:2014.4
The use of CoA thioester intermediates drives formation of small- and medium-sized esters in metabolically engineered E. coli cells, including doubly branched chains generated with enzymes from amino acid degradation pathways. To expand the capabilities of whole-cell biocatalysis, we have engineered Escherichia coli to produce various esters. The alcohol O-acyltransferase (ATF) class of enzyme uses acyl-CoA units for ester formation. The release of free CoA upon esterification with an alcohol provides the free energy to facilitate ester formation. The diversity of CoA molecules found in nature in combination with various alcohol biosynthetic pathways allows for the biosynthesis of a multitude of esters. Small to medium volatile esters have extensive applications in the flavor, fragrance, cosmetic, solvent, paint and coating industries. The present work enables the production of these compounds by designing several ester pathways in E. coli. The engineered pathways generated acetate esters of ethyl, propyl, isobutyl, 2-methyl-1-butyl, 3-methyl-1-butyl and 2-phenylethyl alcohols. In particular, we achieved high-level production of isobutyl acetate from glucose (17.2 g lâ1). This strategy was expanded to realize pathways for tetradecyl acetate and several isobutyrate esters.
利用辅酶A硫酯中间体驱动代谢工程改造的大肠杆菌细胞中形成小分子和中分子酯类,包括通过氨基酸降解途径的酶生成双支链酯。为了扩展全细胞生物催化能力,我们改造了大肠杆菌生产多种酯类。醇O-酰基转移酶类使用酰基-辅酶A单元进行酯形成。与醇酯化释放出自由辅酶A提供自由能促进酯形成。自然界中发现的各种辅酶A分子与多种醇生物合成途径结合,允许生物合成大量酯。小到中挥发性酯在风味、香料、化妆品、溶剂、涂料和涂层行业有广泛应用。本工作通过在大肠杆菌中设计多种酯途径实现这些化合物的生产。改造的途径生成了乙酸酯的乙基、丙基、异丁基、2-甲基-1-丁基、3-甲基-1-丁基和2-苯乙基醇。特别是,我们实现了从葡萄糖(17.2 g l-1)高产率生产乙酸异丁酯。这一策略扩展到实现几种异丁酸酯和乙酸十四烷酯的途径。