Previous Article | Next Article ![]()
Appl. Environ. Microbiol., 06 1995, 2132-2138, Vol 61, No. 6
DR Lovley, EJ Phillips, DJ Lonergan and PK Widman
There is a close phylogenetic relationship between Pelobacter species and
members of the genera Desulfuromonas and Geobacter, and yet there has been
a perplexing lack of physiological similarities. Pelobacter species have
been considered to have a fermentative metabolism. In contrast,
Desulfuromonas and Geobacter species have a respiratory metabolism with
Fe(III) serving as the common terminal electron acceptor in all species.
However, the ability of Pelobacter species to reduce Fe(III) had not been
previously evaluated. When a culture of Pelobacter carbinolicus that had
grown by fermentation of 2,3- butanediol was inoculated into the same
medium supplemented with Fe(III), the Fe(III) was reduced. There was less
accumulation of ethanol and more production of acetate in the presence of
Fe(III). P. carbinolicus grew with ethanol as the sole electron donor and
Fe(III) as the sole electron acceptor. Ethanol was metabolized to acetate.
Growth was also possible on Fe(III) with the oxidation of propanol to
propionate or butanol to butyrate if acetate was provided as a carbon
source. P. carbinolicus appears capable of conserving energy to support
growth from Fe(III) respiration as it also grew with H2 or formate as the
electron donor and Fe(III) as the electron acceptor. Once adapted to
Fe(III) reduction, P. carbinolicus could also grow on ethanol or H2 with S0
as the electron acceptor. P. carbinolicus did not contain detectable
concentrations of the c-type cytochromes that previous studies have
suggested are involved in electron transport to Fe(III) in other organisms
that conserve energy to support growth from Fe(III) reduction.(ABSTRACT
TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Fe(III) and S0 reduction by Pelobacter carbinolicus
This article has been cited by other articles:
| J. Bacteriol. | Microbiol. Mol. Biol. Rev. | Eukaryot. Cell | All ASM Journals |
|---|