Scholarly Work - Chemical & Biological Engineering
Permanent URI for this collectionhttps://scholarworks.montana.edu/handle/1/8718
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Item Janthinobacterium CG23_2: comparative genome analysis reveals enhanced environmental sensing and transcriptional regulation for adaptation to life in an Antarctic supraglacial stream(2019-10) Dieser, Markus; Smith, Heidi J.; Ramaraj, Thiruvarangan; Foreman, Christine M.As many bacteria detected in Antarctic environments are neither true psychrophiles nor endemic species, their proliferation in spite of environmental extremes gives rise to genome adaptations. Janthinobacterium sp. CG23_2 is a bacterial isolate from the Cotton Glacier stream, Antarctica. To understand how Janthinobacterium sp. CG23_2 has adapted to its environment, we investigated its genomic traits in comparison to genomes of 35 published Janthinobacterium species. While we hypothesized that genome shrinkage and specialization to narrow ecological niches would be energetically favorable for dwelling in an ephemeral Antarctic stream, the genome of Janthinobacterium sp. CG23_2 was on average 1.7 ± 0.6 Mb larger and predicted 1411 ± 499 more coding sequences compared to the other Janthinobacterium spp. Putatively identified horizontal gene transfer events contributed 0.92 Mb to the genome size expansion of Janthinobacterium sp. CG23_2. Genes with high copy numbers in the species-specific accessory genome of Janthinobacterium sp. CG23_2 were associated with environmental sensing, locomotion, response and transcriptional regulation, stress response, and mobile elements—functional categories which also showed molecular adaptation to cold. Our data suggest that genome plasticity and the abundant complementary genes for sensing and responding to the extracellular environment supported the adaptation of Janthinobacterium sp. CG23_2 to this extreme environment.Item Draft genome sequence and description of Janthinobacterium sp. strain CG3, a psychrotolerant antarctic Supraglacial stream bacterium(2013-11) Smith, Heidi J.; Akiyama, Tatsuya; Foreman, Christine M.; Franklin, Michael J.; Woyke, Tanja; Teshima, H; Davenport, K.; Daligault, H.; Erkkila, T.; Goodwin, L. A.; Gu, W.; Xu, Yan; Chain, P. S.Here we present the draft genome sequence of Janthinobacterium sp. strain CG3, a psychrotolerant non-violacein-producing bacterium that was isolated from the Cotton Glacier supraglacial stream. The genome sequence of this organism will provide insight into the mechanisms necessary for bacteria to survive in UV-stressed icy environments.Item Genome sequence of Janthinobacterium sp. CG23_2, a violacein-producing isolate from an Antarctic supraglacial stream.(2016-01) Smith, Heidi J.; Foreman, Christine M.; Akiyama, Tatsuya; Franklin, Michael J.; Devitt, N. P.; Ramaraj, ThiruvaranganHere, we present the draft genome sequence for the violacein-producing Janthinobacterium sp. CG23_2 isolated from an Antarctic supraglacial stream. The genome is ~7.85 Mb, with a G+C content of 63.5%. The genome includes 7,247 candidate protein coding genes, which may provide insight into UV tolerance mechanisms.