Abstract
Degeneration is the process whereby Clostridium acetobutylicum ATCC 824 loses the capacity to produce acetone and butanol after repeated vegetative transfers or in continuous culture. Two degenerate mutants (M5 and DG1) of C. acetobutylicum ATCC 824 do not contain the four genes (ctfA, ctfB, adc, and aad) for acetone and butanol formation. Strain ATCC 824 contains a 210-kb plasmid (pSOL1) which is absent in M5 and DG1. pSOL1 carries the four acetone and butanol formation genes. A restriction map of pSOL1 was constructed by using ApaI, SmaI, SstII, and NarI digestions. M5 and DG1 could be complemented for acetone and butanol formation by expressing the corresponding genes (ctfA, ctfB, and adc for acetone; aad for butanol) on the plasmid. Degeneration of this strain thus appears to be the result of pSOL1 loss.
MeSH Terms
Acetone/metabolism
Alcohol Oxidoreductases/genetics
Aldehyde Oxidoreductases/genetics
Bacterial Proteins/genetics
Butanols/metabolism
Carboxy-Lyases/genetics
Clostridium/enzymology,genetics,metabolism
Coenzyme A-Transferases/genetics
Conjugation, Genetic
Genes, Bacterial/genetics
Multienzyme Complexes/genetics
Operon/genetics
Plasmids/genetics,metabolism
Restriction Mapping
Chemicals
Bacterial Proteins
Butanols
Multienzyme Complexes
Acetone
AAD protein, Clostridium acetobutylicum
Alcohol Oxidoreductases
Aldehyde Oxidoreductases
Coenzyme A-Transferases
ctfA protein, Clostridium acetobutylicum
ctfB protein, Clostridium acetobutylicum
Carboxy-Lyases
acetoacetate decarboxylase
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Cornillot E
INSA, Centre de Bioingénierie Gilbert Durand, Complexe Scientifique deRangueil, Toulouse, France.
Nair R V
Papoutsakis E T
Soucaille P
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