Ethanol production by engineered thermophiles.

Abstract:

:We compare a number of different strategies that have been pursued to engineer thermophilic microorganisms for increased ethanol production. Ethanol production from pyruvate can proceed via one of four pathways, which are named by the key pyruvate dissimilating enzyme: pyruvate decarboxylase (PDC), pyruvate dehydrogenase (PDH), pyruvate formate lyase (PFL), and pyruvate ferredoxin oxidoreductase (PFOR). For each of these pathways except PFL, we see examples where ethanol production has been engineered with a yield of >90% of the theoretical maximum. In each of these cases, this engineering was achieved mainly by modulating expression of native genes. We have not found an example where a thermophilic ethanol production pathway has been transferred to a non-ethanol-producing organism to produce ethanol at high yield. A key reason for the lack of transferability of ethanol production pathways is the current lack of understanding of the enzymes involved.

journal_name

Curr Opin Biotechnol

authors

Olson DG,Sparling R,Lynd LR

doi

10.1016/j.copbio.2015.02.006

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

130-41

eissn

0958-1669

issn

1879-0429

pii

S0958-1669(15)00025-7

journal_volume

33

pub_type

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