Selenomonas ruminantium PC18
Introduction
Pseudoselenomonas lactilytica PC 18T
Pseudoselenomonas lactilytica PC18T (DSM 2872), formerly Selenomonas ruminantium subsp. lactilytica was isolated from bovine rumen contents from an animal fed a grass pasture and grain mixture in the USA [1]. PC 18 is an anaerobic bacterium that ferments a broad range of carbohydrates and produces primarily propionate, lactate, and CO₂ [1, 2]. Lactate is fermented to propionate and acetate [1], and PC 18 can reduce nitrate, sulfate and fumarate. PC 18 is the type strain of the species.
Rumen metatranscriptomic and metagenomic studies have shown that in addition to methanogenesis there are other pathways of H2 use, including nitrate, sulfate, and fumarate reduction as well as homoacetogenesis [3]. Sulfate and nitrate are external electron acceptors that can be taken up from the environment and reduced to sulfide and ammonia, respectively, while fumarate is reduced to succinate followed by decarboxylation to propionate.
The draft genome for PC 18 (3,039,002 bp) was generated through the Hungate1000 project with JGI [4]. Resequencing gave a 3,074,662 genome consisting of a chromosome (2,979,598 bp) and two plasmids (76,524 bp and 18,540 bp).
LPSN: Pseudoselenomonas lactilytica (Bryant 1956) Heng and Kittelmann 2026.
NCBI: Pseudoselenomonas lactilytica.
GTDB: Selenomonas_A ruminantium_B.
Risk group: 1.
Global Methane Hub Metadata
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