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Microb Cell Fact. 2017 May 2;16(1):74. doi: 10.1186/s12934-017-0683-z.

Functional screening of aldehyde decarbonylases for long-chain alkane production by Saccharomyces cerevisiae.

Kang MK1, Zhou YJ1,2,3, Buijs NA1,4, Nielsen J5,6,7,8.

Author information

1
Department of Biology and Biological Engineering, Chalmers University of Technology, Kemivägen 10, 412 96, Gothenburg, Sweden.
2
Novo Nordisk Foundation Center for Biosustainability, Chalmers University of Technology, 412 96, Gothenburg, Sweden.
3
Division of Biotechnology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
4
Evolva Biotech, Lersø Parkalle, 40-42, 2100, Copenhagen, Denmark.
5
Department of Biology and Biological Engineering, Chalmers University of Technology, Kemivägen 10, 412 96, Gothenburg, Sweden. nielsenj@chalmers.se.
6
Novo Nordisk Foundation Center for Biosustainability, Chalmers University of Technology, 412 96, Gothenburg, Sweden. nielsenj@chalmers.se.
7
Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kogle allé, 2970, Hørsholm, Denmark. nielsenj@chalmers.se.
8
Science for Life Laboratory, Royal Institute of Technology, 17121, Solna, Sweden. nielsenj@chalmers.se.

Abstract

BACKGROUND:

Low catalytic activities of pathway enzymes are often a limitation when using microbial based chemical production. Recent studies indicated that the enzyme activity of aldehyde decarbonylase (AD) is a critical bottleneck for alkane biosynthesis in Saccharomyces cerevisiae. We therefore performed functional screening to identify efficient ADs that can improve alkane production by S. cerevisiae.

RESULTS:

A comparative study of ADs originated from a plant, insects, and cyanobacteria were conducted in S. cerevisiae. As a result, expression of aldehyde deformylating oxygenases (ADOs), which are cyanobacterial ADs, from Synechococcus elongatus and Crocosphaera watsonii converted fatty aldehydes to corresponding Cn-1 alkanes and alkenes. The CwADO showed the highest alkane titer (0.13 mg/L/OD600) and the lowest fatty alcohol production (0.55 mg/L/OD600). However, no measurable alkanes and alkenes were detected in other AD expressed yeast strains. Dynamic expression of SeADO and CwADO under GAL promoters increased alkane production to 0.20 mg/L/OD600 and no fatty alcohols, with even number chain lengths from C8 to C14, were detected in the cells.

CONCLUSIONS:

We demonstrated in vivo enzyme activities of ADs by displaying profiles of alkanes and fatty alcohols in S. cerevisiae. Among the AD enzymes evaluated, cyanobacteria ADOs were found to be suitable for alkane biosynthesis in S. cerevisiae. This work will be helpful to decide an AD candidate for alkane biosynthesis in S. cerevisiae and it will provide useful information for further investigation of AD enzymes with improved activities.

KEYWORDS:

Aldehyde decarbonylase; Alkane biosynthesis; Biofuels; Metabolic engineering; Saccharomyces cerevisiae

PMID:
28464872
PMCID:
PMC5414326
DOI:
10.1186/s12934-017-0683-z
[Indexed for MEDLINE]
Free PMC Article

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