Clostridium proteoclasticum: a ruminal bacterium that forms stearic acid from linoleic acid
Open Access
- 1 December 2006
- journal article
- Published by Oxford University Press (OUP) in FEMS Microbiology Letters
- Vol. 265 (2), 195-201
- https://doi.org/10.1111/j.1574-6968.2006.00487.x
Abstract
The aim of this study was to identify ruminal bacteria that form stearic acid (18 : 0) from linoleic acid (cis-9,cis-12-18 : 2). One 18 : 0-producing isolate, P-18, isolated from the sheep rumen was similar in morphology and metabolic properties to ‘Fusocillus’ spp. isolated many years ago. Phylogenetic analysis based on nearly full-length 16S rRNA gene sequence (> 1300 bp) analysis indicated that the stearate producer was most closely related to Clostridium proteoclasticum B316T. Clostridium proteoclasticum B316T was also found to form 18 : 0, as were other bacteria isolated elsewhere, which occurred in the same family subclass of the low G+C% Gram-positive bacteria, related to Butyrivibrio fibrisolvens. These bacteria are not clostridia, and the ability to form 18 : 0 was present in all strains in contrast to proteolytic activity, which was variable. Production of 18 : 0 occurred in growing, but not in stationary-phase, bacteria, which made detection of biohydrogenating activity difficult, because of the inhibitory effects of linoleic acid on growth.Keywords
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