Genomic insights into the salt tolerance and cold adaptation of Planococcus halotolerans SCU63 T
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Genomic insights into the salt tolerance and cold adaptation of Planococcus halotolerans SCU63T Longzhan Gan1,2 · Xiaoguang Li1,2 · Yongqiang Tian1,2 · Biyu Peng1,2 Received: 26 April 2020 / Revised: 17 June 2020 / Accepted: 9 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Planococcus halotolerans, recently described as a novel species with S CU63T as the type strain, is capable of thriving in up to 15% NaCl and temperatures as low as 0 °C. To better understand its adaptation strategies at the genomic level, strain SCU63T was subjected to whole-genome sequencing and data mining. The high-quality assembly yielded 17 scaffolds with a genome size of 3,622,698 bp. Its genome harbors 3683 protein-coding sequences and 127 RNA genes, as well as three biosynthetic gene clusters and 25 genomic islands. The phylogenomic tree provided compelling insights into the evolutionary relationships of Planococcus. Comparative genomic analysis revealed key similarities and differences in the functional gene categories among Planococcus species. Strain SCU63T was shown to have diverse stress response systems for high salt and cold habitats. Further comparison with three related species showed the presence of numerous unique gene clusters in the SCU63T genome. The strain might serve as a good model for using extremozymes in various biotechnological processes. Keywords Comparative genomics · Planococcus halotolerans · Halotolerant · Psychro-tolerant · Stress response
Introduction One of the main saline-alkali areas in China, the Hexi Corridor in Gansu Province is a typical temperate, desert climate. It has an inhospitable environment with high salinity, dramatic temperature fluctuations, and intense solar ultraviolet radiation. This region is widely acknowledged as a primary location for exploiting novel microbial resources with unique traits geared to the extreme demands of their ecological niches (Cherif et al. 2015). Besides their biodiversity and Communicated by Erko Stackebrandt. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00203-020-01979-9) contains supplementary material, which is available to authorized users. * Yongqiang Tian [email protected] * Biyu Peng [email protected] 1
College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, People’s Republic of China
2
ecological significance, these extremophiles have gained attention due to their potential for biotechnological processes, particularly industrially relevant extremozymes and biomaterials. Recent attempts to explore the culturable salttolerant bacteria in the Hexi Corridor have yielded previously unknown halophilic and halotolerant species (Gan et al. 2018a, b, c, d, 2020). However, though the taxonomic status of these new isolates has been examined using a polyphasic approach, our know
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