AI Article Synopsis
- The bacterial phylum Gemmatimonadetes contains members known for bacteriochlorophyll-based phototrophy, yet only one strain has been isolated, limiting our understanding of their lifestyle and evolution.
- A new strain, designated TET16, was isolated from stream water in the High Arctic of Greenland, showing distinct characteristics such as being strictly aerobic and anoxygenic while having a different photosystem compared to the previously known strain AP64.
- Genome sequencing of TET16 revealed unique features in its photosynthesis gene clusters, and metagenomic analyses indicate a broader distribution of CGB in soil and glacier environments in Northeast Greenland.
Article Abstract
The bacterial phylum Gemmatimonadetes contains members capable of performing bacteriochlorophyll-based phototrophy (chlorophototrophy). However, only one strain of chlorophototrophic Gemmatimonadetes bacteria (CGB) has been isolated to date, hampering our further understanding of their photoheterotrophic lifestyle and the evolution of phototrophy in CGB. By combining a culturomics strategy with a rapid screening technique for chlorophototrophs, we report the isolation of a new member of CGB, sp. nov., from the surface water of a stream in the Zackenberg Valley in High Arctic Greenland. Distinct from the microaerophilic strain AP64, strain TET16 is a strictly aerobic anoxygenic phototroph, lacking many oxygen-independent enzymes while possessing an expanded arsenal for coping with oxidative stresses. Its pigment composition and infra-red absorption properties are also different from , indicating that it possesses a different photosystem apparatus. The complete genome sequence of reveals unique and conserved features in the photosynthesis gene clusters of CGB. We further analyzed metagenome-assembled genomes of CGB obtained from soil and glacier metagenomes from Northeast Greenland, revealing a wide distribution pattern of CGB beyond the stream water investigated.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7844134 | PMC |
| http://dx.doi.org/10.3389/fmicb.2020.606612 | DOI Listing |
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