Sulfonates: Novel electron acceptors in anaerobic respiration

The enrichment and isolation in pure culture of a bacterium, identified as a strain of Desulfovbrio, able to release rind reduce the sulfur of isethionate (2-hydroxy-ethanesulfonate) and other sulfonates to support anaerobic respiratory growth, is described, The sulfonate moiety was the source of sulfur that served as the terminal electron acceptor, while the carbon skeleton of isethionate functioned as an accessory electron donor for the reduction of sulfite. Cysteate (alanine-3-sulfonate) and sulfoacetaldehyde (acetaldehyde-2-sulfonate) could also be used for anaerobic respiration, but many other sulfonates could not, A survey of known sulfate-reducing bacteria revealed that some. but not all, strains tested could utilize the sulfur of same sulfonates as terminal electron acceptor. Isethionate-grown cells of Desulfovibrio io strain ICl reduced sulfonate-sulfur in preference to that of sulfate; however, sulfate-grown cells reduced sulfate-sulfur in preference to that of sulfonate.