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J. Bacteriol., Sep 1997, 5442-5447, Vol 179, No. 17
E Cornillot, RV Nair, ET Papoutsakis and P Soucaille
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.
Copyright © 1997, American Society for Microbiology
The genes for butanol and acetone formation in Clostridium acetobutylicum ATCC 824 reside on a large plasmid whose loss leads to degeneration of the strain
INSA, Centre de Bioingenierie Gilbert Durand, Complexe Scientifique deRangueil, Toulouse, France.
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