Metabolic engineering of Clostridium tyrobutyricum for n-butanol production: effects of CoA transferase

The overexpression of CoA transferase (ctfAB), which catalyzes the reaction: acetate/butyrate + acetoacetyl-CoA → acetyl/butyryl-CoA + acetoacetate, was studied for its effects on acid reassimilation and butanol biosynthesis in Clostridium tyrobutyricum (Δack, adhE2). The plasmid pMTL007 was used to...

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Veröffentlicht in:Applied microbiology and biotechnology 2015-06, Vol.99 (11), p.4917-4930
Hauptverfasser: Yu, Le, Zhao, Jingbo, Xu, Mengmeng, Dong, Jie, Varghese, Saju, Yu, Mingrui, Tang, I-Ching, Yang, Shang-Tian
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container_end_page 4930
container_issue 11
container_start_page 4917
container_title Applied microbiology and biotechnology
container_volume 99
creator Yu, Le
Zhao, Jingbo
Xu, Mengmeng
Dong, Jie
Varghese, Saju
Yu, Mingrui
Tang, I-Ching
Yang, Shang-Tian
description The overexpression of CoA transferase (ctfAB), which catalyzes the reaction: acetate/butyrate + acetoacetyl-CoA → acetyl/butyryl-CoA + acetoacetate, was studied for its effects on acid reassimilation and butanol biosynthesis in Clostridium tyrobutyricum (Δack, adhE2). The plasmid pMTL007 was used to co-express adhE2 and ctfAB from Clostridium acetobutylicum ATCC 824. In addition, the sol operon containing ctfAB, adc (acetoacetate decarboxylase), and ald (aldehyde dehydrogenase) was also cloned from Clostridium beijerinckii NCIMB 8052 and expressed in C. tyrobutyricum (Δack, adhE2). Mutants expressing these genes were evaluated for their ability to produce butanol from glucose in batch fermentations at pH 5.0 and 6.0. Compared to C. tyrobutyricum (Δack, adhE2) without expressing ctfAB, all mutants with ctfAB overexpression produced more butanol, with butanol yield increased to 0.22 − 0.26 g/g (vs. 0.10 − 0.13 g/g) and productivity to 0.35 g/l h (vs. 0.13 g/l h) because of the reduced acetate and butyrate production. The expression of ctfAB also resulted in acetone production from acetoacetate through a non-enzymatic decarboxylation.
doi_str_mv 10.1007/s00253-015-6566-5
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metabolism</topic><topic>acetates</topic><topic>acetone</topic><topic>Acetone - metabolism</topic><topic>Acids</topic><topic>Alcohol</topic><topic>aldehyde dehydrogenase</topic><topic>Bacteria</topic><topic>Biodiesel fuels</topic><topic>Bioenergy and Biofuels</topic><topic>Bioengineering</topic><topic>Biofuels</topic><topic>Biomedical and Life Sciences</topic><topic>Biosynthesis</topic><topic>Biotechnology</topic><topic>Butanol</topic><topic>butyrates</topic><topic>Cloning</topic><topic>Clostridium</topic><topic>Clostridium acetobutylicum</topic><topic>Clostridium acetobutylicum - enzymology</topic><topic>Clostridium acetobutylicum - genetics</topic><topic>Clostridium beijerinckii</topic><topic>Clostridium beijerinckii - enzymology</topic><topic>Clostridium beijerinckii - genetics</topic><topic>Clostridium tyrobutyricum</topic><topic>Clostridium tyrobutyricum - enzymology</topic><topic>Clostridium tyrobutyricum - genetics</topic><topic>Clostridium tyrobutyricum - metabolism</topic><topic>Coenzyme A-Transferases - 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The plasmid pMTL007 was used to co-express adhE2 and ctfAB from Clostridium acetobutylicum ATCC 824. In addition, the sol operon containing ctfAB, adc (acetoacetate decarboxylase), and ald (aldehyde dehydrogenase) was also cloned from Clostridium beijerinckii NCIMB 8052 and expressed in C. tyrobutyricum (Δack, adhE2). Mutants expressing these genes were evaluated for their ability to produce butanol from glucose in batch fermentations at pH 5.0 and 6.0. Compared to C. tyrobutyricum (Δack, adhE2) without expressing ctfAB, all mutants with ctfAB overexpression produced more butanol, with butanol yield increased to 0.22 − 0.26 g/g (vs. 0.10 − 0.13 g/g) and productivity to 0.35 g/l h (vs. 0.13 g/l h) because of the reduced acetate and butyrate production. The expression of ctfAB also resulted in acetone production from acetoacetate through a non-enzymatic decarboxylation.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><pmid>25851718</pmid><doi>10.1007/s00253-015-6566-5</doi><tpages>14</tpages></addata></record>
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1432-0614
language eng
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source MEDLINE; SpringerNature Journals
subjects 1-Butanol - metabolism
acetates
acetone
Acetone - metabolism
Acids
Alcohol
aldehyde dehydrogenase
Bacteria
Biodiesel fuels
Bioenergy and Biofuels
Bioengineering
Biofuels
Biomedical and Life Sciences
Biosynthesis
Biotechnology
Butanol
butyrates
Cloning
Clostridium
Clostridium acetobutylicum
Clostridium acetobutylicum - enzymology
Clostridium acetobutylicum - genetics
Clostridium beijerinckii
Clostridium beijerinckii - enzymology
Clostridium beijerinckii - genetics
Clostridium tyrobutyricum
Clostridium tyrobutyricum - enzymology
Clostridium tyrobutyricum - genetics
Clostridium tyrobutyricum - metabolism
Coenzyme A-Transferases - genetics
Coenzyme A-Transferases - metabolism
decarboxylation
Dehydrogenases
E coli
Fermentation
Gene Deletion
Gene Expression
gene overexpression
Genes
Genetic aspects
Genetic engineering
Glucose
Glucose - metabolism
Kinases
Life Sciences
Metabolic Engineering
Metabolic Networks and Pathways - genetics
Metabolism
Methods
Microbial Genetics and Genomics
Microbiology
mutants
operon
Physiological aspects
Plasmids
Production processes
Studies
title Metabolic engineering of Clostridium tyrobutyricum for n-butanol production: effects of CoA transferase
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