Polyphasic Identification and Genomic Insights of gen. sp. nov., a Novel Thermophilic Cyanobacteria Within Leptolyngbyaceae.
Jie Tang, Mahfuzur R Shah, Dan Yao, Ying Jiang, Lianming Du, Kelei Zhao, Liheng Li, Meijin Li, Michal M Waleron, Malgorzata Waleron, Krzysztof Waleron, Maurycy Daroch
Author Information
Jie Tang: Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China.
Mahfuzur R Shah: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China.
Dan Yao: Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China.
Ying Jiang: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China.
Lianming Du: Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China.
Kelei Zhao: Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, China.
Liheng Li: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China.
Meijin Li: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China.
Michal M Waleron: Department of Pharmaceutical Microbiology, Faculty of Pharmacy Medical University of Gdańsk, Gdańsk, Poland.
Malgorzata Waleron: Laboratory of Plant Protection and Biotechnology, Intercollegiate Faculty of Biotechnology University of Gdańsk and Medical University of Gdańsk, University of Gdańsk, Gdańsk, Poland.
Krzysztof Waleron: Department of Pharmaceutical Microbiology, Faculty of Pharmacy Medical University of Gdańsk, Gdańsk, Poland.
Maurycy Daroch: School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, China.
Thermal environments are an important reservoir of thermophiles with significant ecological and biotechnological potentials. However, thermophilic isolates remain largely unrecovered from their habitats and are rarely systematically identified. In this study, we characterized using polyphasic approaches a thermophilic strain, PKUAC-SCTAE412 (E412 hereafter), recovered from Lotus Lake hot spring based in Ganzi prefecture, China. The results of 16S rRNA/16S-23S ITS phylogenies, secondary structure, and morphology comparison strongly supported that strain E412 represent a novel genus within Leptolyngbyaceae. This delineation was further confirmed by genome-based analyses [phylogenomic inference, average nucleotide/amino-acid identity, and the percentages of conserved proteins (POCP)]. Based on the botanical code, the isolate is herein delineated as gen. sp. nov, a genus adjacent to recently delineated and . In addition, we successfully obtained the first complete genome of this new genus. Genomic analysis revealed its adaptations to the adverse hot spring environment and extensive molecular components related to mobile genetic elements, photosynthesis, and nitrogen metabolism. Moreover, the strain was capable of modifying the composition of its light-harvesting apparatus depending on the wavelength and photoperiod, showing chromatic adaptation capacity characteristic for T1 and T2 pigmentation types. Other physiological studies showed the strain's ability to utilize sodium bicarbonate and various sulfur compounds. The strain was also shown to be diazotrophic. Interestingly, 24.6% of annotated protein-coding genes in the E412 genome were identified as putatively acquired, hypothesizing that a large number of genes acquired through HGT might contribute to the genome expansion and habitat adaptation of those thermophilic strains. Most the HGT candidates (69.4%) were categorized as metabolic functions as suggested by the KEGG analysis. Overall, the complete genome of strain E412 provides the first insight into the genomic feature of the genus and lays the foundation for future global ecogenomic and geogenomic studies.
