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Isopentenyl diphosphate (IPP)-bypass mevalonate pathways for isopentenol production

Journal Article · · Metabolic Engineering
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Branched C 5 alcohols are promising biofuels with excellent combustion properties. A mevalonate (MVA)-based isoprenoid biosynthetic pathway for C 5 alcohols was constructed in Escherichia coli using genes from several organisms, and the pathway was optimized to achieve over 50% theoretical yield. Although the MVA pathway is energetically less efficient than the native methylerythritol 4-phosphate (MEP) pathway, implementing the MVA pathway in bacterial hosts such as E. coli is advantageous due to its lack of endogenous regulation. The MVA and MEP pathways intersect at isopentenyl diphosphate (IPP), the direct precursor to isoprenoid-derived C 5 alcohols and initial precursor to longer chain terpenes, which makes independent regulation of the pathways difficult. In pursuit of the complete "decoupling" of the MVA pathway from native cellular regulation, we designed novel IPP-bypass MVA pathways for C 5 alcohol production by utilizing promiscuous activities of two enzymes, phosphomevalonate decarboxylase (PMD) and an E. coli-endogenous phosphatase (AphA). These bypass pathways have reduced energetic requirements, are further decoupled from intrinsic regulation, and are free from IPP-related toxicity. In addition to these benefits, we demonstrate that reduced aeration rate has less impact on the bypass pathway than the original MVA pathway. Finally, we showed that performance of the bypass pathway was primarily determined by the activity of PMD. We designed PMD mutants with improved activity and demonstrated titer increases in the mutant strains. These modified pathways would be a good platform for industrial production of isopentenol and related chemicals such as isoprene.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1393030
Alternate ID(s):
OSTI ID: 1400019
Journal Information:
Metabolic Engineering, Journal Name: Metabolic Engineering Vol. 34; ISSN 1096-7176
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Metabolic engineering for the production of isoprene and isopentenol by Escherichia coli journal July 2018
Restoration of biofuel production levels and increased tolerance under ionic liquid stress is enabled by a mutation in the essential Escherichia coli gene cydC journal October 2018
Metabolic engineering of Escherichia coli for production of mixed isoprenoid alcohols and their derivatives journal July 2018
Engineering Corynebacterium glutamicum to produce the biogasoline isopentenol from plant biomass hydrolysates journal February 2019
A mevalonate bypass system facilitates elucidation of plastid biology in malaria parasites journal February 2020
Transcript Profiling of Hevea brasiliensis during Latex Flow journal November 2017
Recent advances of metabolic engineering strategies in natural isoprenoid production using cell factories journal January 2020
Two-step pathway for isoprenoid synthesis journal December 2018
Metabolic engineering of Escherichia coli for the production of isoprenoids journal March 2018
Isoprenoid-Based Biofuels: Homologous Expression and Heterologous Expression in Prokaryotes journal July 2016
Towards efficient terpenoid biosynthesis: manipulating IPP and DMAPP supply journal February 2019
Restoration of biofuel production levels and increased tolerance under ionic liquid stress is enabled by a mutation in the essential Escherichia coli gene cydC text January 2018
Enhanced (−)-α-Bisabolol Productivity by Efficient Conversion of Mevalonate in Escherichia coli journal May 2019

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