The Prokaryotic Microalga Limnothrix redekei KNUA012 to Improve Aldehyde Decarbonylase Expression for Use as a Biological Resource

The prokaryotic microalga Limnothrix redekei KNUA012 isolated from a freshwater bloom sample from Lake Hapcheon, Hapcheon-gun, South Korea, was investigated for its potential as a biofuel feedstock. Microalgae produce straight-chain alkanes/alkenes from acyl carrier protein-linked fatty acyls via al...

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Published inPolish Journal of Microbiology Vol. 72; no. 3; pp. 307 - 317
Main Authors Young-Saeng, Kim, Baek, Haeri, Hyun-Sik Yun, Lee, Jae-Hak, Lee, Kyoung-In, Han-Soon, Kim, Ho-Sung, Yoon
Format Journal Article
LanguageEnglish
Published Warsaw De Gruyter Poland 01.09.2023
Sciendo
Subjects
Acyl carrier protein
aldehyde decarbonylase
Aldehyde dehydrogenase
Aldehydes
Algae
Alkanes
Alkenes
Aquatic microorganisms
Biodiesel fuels
Biofuels
biomass
E coli
fatty acid
Fatty acids
Freshwater
Freshwater lakes
Heptadecane
Inland water environment
Intermediates
Lakes
Lauric acid
Microalgae
Original Paper
Palmitic acid
Palmitoleic acid
Phytoplankton
Raw materials
Transesterification
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Summary:The prokaryotic microalga Limnothrix redekei KNUA012 isolated from a freshwater bloom sample from Lake Hapcheon, Hapcheon-gun, South Korea, was investigated for its potential as a biofuel feedstock. Microalgae produce straight-chain alkanes/alkenes from acyl carrier protein-linked fatty acyls via aldehyde decarbonylase (AD; EC 1.2.1.3), which can convert aldehyde intermediates into various biofuel precursors, such as alkanes and free fatty acids. In L. redekei KNUA012, long-chain ADs can convert fatty aldehyde intermediates into alkanes. After heterologous AD expression in Escherichia coli (pET28-AD), we identified an AD in L. redekei KNUA012 that can synthesize various alkanes, such as pentadecane (C15H32), 8-heptadecene (C17H34), and heptadecane (C17H36). These alkanes can be directly used as fuels without transesterification. Biodiesel constituents including dodecanoic acid (C13H26O2), tetradecanoic acid (C15H30O2), 9-hexa decenoic acid (C17H32O2), palmitoleic acid (C17H32O2), hexadecanoic acid (C17H34O2), 9-octadecenoic acid (C19H36O2), and octadecanoic acid (C19H38O2) are produced by L. redekei KNUA012 as the major fatty acids. Our findings suggest that Korean domestic L. redekei KNUA012 is a promising resource for microalgae-based biofuels and biofuel feedstock.
Bibliography:Young-Saeng Kim, Haeri Baek and Hyun-Sik Yun contributed equally to this study.
ISSN:1733-1331
2544-4646
DOI:10.33073/pjm-2023-031