Open AccessUtilization of methylacetoin by the strict anaerobe Pelobacter carbinolicus and consequences for the catabolism of acetoin
Author(s) -
Bernd Oppermann Fred,
Steinbüchel Alexander,
Schlegel Hans G.
Publication year - 1988
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1988.tb02796.x
Subject(s) - acetoin , diacetyl , acetaldehyde , chemistry , 2,3 butanediol , fermentation , acetone , biochemistry , catabolism , ethanol , enzyme , stereochemistry
Pelobacter carbinolicus strain GraBd1 fermented methylacetoin, which is a good carbon source for growth ( μ = 0.16 h −1 ) of this strict anaerobic bacterium, to acetone, acetate and ethanol (main products), acetoin, 2,3‐butanediol and methylbutanediol (minor products). During growth on 2,3‐butanediol, acetoin and methyl‐acetoin the formation of a protein exhibiting acetoin: DCPIP oxidoreductase activity is induced. This enzyme amounts to a substantial portion of the soluble proteins. In vitro, it cleaves acetoin into acetate and acetaldehyde but reacts also with diacetyl or methylacetoin. We discussed four different models for the degradation of acetoin in the cells and came to the conclusion that in vivo the oxidative‐thiolytic acetoin cleavage model is most probably realized in P. carbinolicus .