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Functional screening of aldehyde decarbonylases for long-chain alkane production by Saccharomyces cerevisiae
KTH, Skolan för bioteknologi (BIO), Genteknologi. KTH, Centra, Science for Life Laboratory, SciLifeLab.
2017 (Engelska)Ingår i: Microbial Cell Factories, ISSN 1475-2859, E-ISSN 1475-2859, Vol. 16, artikel-id 74Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
BioMed Central, 2017. Vol. 16, artikel-id 74
Nyckelord [en]
Metabolic engineering, Saccharomyces cerevisiae, Alkane biosynthesis, Aldehyde decarbonylase, Biofuels
Nationell ämneskategori
Biokatalys och enzymteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-207888DOI: 10.1186/s12934-017-0683-zISI: 000400327100001PubMedID: 28464872Scopus ID: 2-s2.0-85019099241OAI: oai:DiVA.org:kth-207888DiVA, id: diva2:1103325
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QC 20170530

Tillgänglig från: 2017-05-30 Skapad: 2017-05-30 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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Nielsen, Jens

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Nielsen, Jens
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Microbial Cell Factories
Biokatalys och enzymteknik

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