Pseudoselenomonas ruminantium
| Pseudoselenomonas ruminantium | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Kingdom: | Bacillati |
| Phylum: | Bacillota |
| Class: | Negativicutes |
| Order: | Selenomonadales |
| Family: | Selenomonadaceae |
| Genus: | Pseudoselenomonas |
| Species: | P. ruminantium |
| Binomial name | |
| Pseudoselenomonas ruminantium (Certes 1889) Heng and Kittelmann 2026[1] | |
| Type strain | |
| GA192 (= ATCC 12561 = DSM 2150) | |
| Synonyms[1] | |
| |
Pseudoselenomonas ruminantium is a species of obligately anaerobic, Gram-negative, motile bacteria in the family Selenomonadaceae. Its cells are curved or crescent-shaped rods, and it was originally isolated from the bovine rumen.[2][3] The type strain is GA192, also deposited as ATCC 12561 and DSM 2150.[1]
Taxonomy
The organism was originally described as "Ancyromonas ruminantium" in 1889 and was later classified as Selenomonas ruminantium.[1] The former species included the subspecies S. ruminantium subsp. ruminantium and S. ruminantium subsp. lactilytica.[2]
Phylogenetic and comparative genomic analyses published in 2026 placed the type-bearing taxon in the new genus Pseudoselenomonas as Pseudoselenomonas ruminantium. The former subspecies S. ruminantium subsp. lactilytica was recognized as a separate species, Pseudoselenomonas lactilytica.[4]
Characteristics and metabolism
Strain GA192 ferments glucose and produces L-lactate but does not ferment lactate. Under glucose-limited continuous culture, it produces predominantly propionate and acetate at lower growth rates, with proportionally greater lactate production at higher growth rates.[5]
GA192 can use arabinose, xylose, and xylo-oligosaccharides ranging from xylobiose to xylopentaose, as well as larger xylo-oligosaccharides.[6] In coculture, the strain can consume soluble xylo-oligosaccharides released during the degradation of xylan by Butyrivibrio fibrisolvens, demonstrating metabolic cross-feeding between rumen bacteria.[7]
A bifunctional glycoside hydrolase family 43 β-D-xylosidase/α-L-arabinofuranosidase from the species has been characterized biochemically and by X-ray crystallography.[8]
References
- 1 2 3 4 "Species: Pseudoselenomonas ruminantium". List of Prokaryotic names with Standing in Nomenclature. Leibniz Institute DSMZ. Retrieved 27 July 2026.
- 1 2 Bryant, Marvin P. (1956). "The characteristics of strains of Selenomonas isolated from bovine rumen contents". Journal of Bacteriology. 72 (2): 162–167. doi:10.1128/jb.72.2.162-167.1956. PMC 357873. PMID 13366893.
- ↑ "Selenomonas ruminantium subsp. ruminantium GA-192". BacDive. Leibniz Institute DSMZ. Retrieved 27 July 2026.
- ↑ Heng, Yu Chyuan; Kittelmann, Sandra (2026). "Taxonomic reclassification and expansion of the family Selenomonadaceae". International Journal of Systematic and Evolutionary Microbiology. 76 (5) 007178. doi:10.1099/ijsem.0.007178. PMID 42207170.
- ↑ Scheifinger, C. C.; Latham, M. J.; Wolin, M. J. (1975). "Relationship of lactate dehydrogenase specificity and growth rate to lactate metabolism by Selenomonas ruminantium". Applied Microbiology. 30 (6): 916–921. doi:10.1128/am.30.6.916-921.1975. PMC 376568. PMID 174490.
- ↑ Cotta, Michael A.; Whitehead, Thomas R. (1998). "Xylooligosaccharide utilization by the ruminal anaerobic bacterium Selenomonas ruminantium". Current Microbiology. 36 (4): 183–189. doi:10.1007/s002849900291. PMID 9504982.
- ↑ Cotta, Michael A.; Zeltwanger, Richard L. (1995). "Degradation and utilization of xylan by the ruminal bacteria Butyrivibrio fibrisolvens and Selenomonas ruminantium". Applied and Environmental Microbiology. 61 (12): 4396–4402. doi:10.1128/aem.61.12.4396-4402.1995. PMC 167747. PMID 8534103.
- ↑ Brunzelle, Joseph S.; Jordan, Douglas B.; McCaslin, Darrell R.; Olczak, Andrzej; Wawrzak, Zdzislaw (2008). "Structure of the two-subsite beta-D-xylosidase from Selenomonas ruminantium in complex with 1,3-bis[tris(hydroxymethyl)methylamino]propane". Archives of Biochemistry and Biophysics. 474 (1): 157–166. doi:10.1016/j.abb.2008.03.007. PMID 18374656.