Abstract
The genus Lacinutrix, which belongs to the family Flavobacteriaceae, consists of seven bacterial species that were mainly isolated from marine life and sediments. As most bacteria in the family Flavobacteriaceae favor aerobic conditions, the seven bacterial species in the genus Lacinutrix also showed aerobic growth. We selected four monophyletic bacterial species living in a polar environment. Two of these species were isolated from sediment and two types were isolated from algae. In a comparative analysis, we investigated how these different environments were related to genomic features of these four species in the genus Lacinutrix. We found that the gene sets for glycolysis, the Krebs cycle, and oxidative phosphorylation were conserved in these four type strains. However, the presence of nitrous oxide reductase for denitrification and the absence of essential components related to thiamin biosynthesis for aerobic respiration were only found in isolates from sediment. Elevated bacterial metabolism on the surface of marine sediments might limit the oxygen penetration into sediment, and such an environment might affect the genomes of bacteria isolated from these habitats.
Highlights
The genus Lacinutrix was established with the species Lacinutrix copepodicola and was determined to belong to family Flavobacteriaceae [1]
L. copepodicola was isolated from a copepod found in a lake in Antarctica, L. algicola AKS293T and L. mariniflava AKS432T were isolated from a marine red algae at Marian Cove on King George Island, Antarctica, L. himadriensis E4-9aT was isolated from marine sediment from Kongsfjorden Svalbard in the Arctic Ocean, and L. jangbogonensis Polar and Alpine Microbial Collection (PAMC) 27137T was isolated from marine sediment from the Ross Sea, Antarctica
PAMC 27137T and E4-9aT were isolated from marine sediments in the Southern and Artic Oceans, respectively, and the other two strains were isolated from algae in the Southern Ocean
Summary
The genus Lacinutrix was established with the species Lacinutrix copepodicola and was determined to belong to family Flavobacteriaceae [1]. The 16S rRNA gene sequences retrieved from whole genome sequencing were compared with those of all bacterial strains in the EzTaxon-e database [10]. To better understand the genus Lacinutrix and its environmental adaptations, we selected three of the closest type strains (AKS293T, AKS432T, and E4-9aT) for a comparative genetic analysis (Fig 1).
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