Abstract
Environmental temperature is one of the most important factors for the growth and survival of microorganisms. Here we describe a novel extremely halophilic archaeon (haloarchaea) designated as strain CBA1119T isolated from solar salt. Strain CBA1119T had the highest maximum and optimal growth temperatures (66 °C and 55 °C, respectively) and one of the largest genome sizes among haloarchaea (5.1 Mb). It also had the largest number of strain-specific pan-genome orthologous groups and unique pathways among members of the genus Natrinema in the class Halobacteria. A dendrogram based on the presence/absence of genes and a phylogenetic tree constructed based on OrthoANI values highlighted the particularities of strain CBA1119T as compared to other Natrinema species and other haloarchaea members. The large genome of strain CBA1119T may provide information on genes that confer tolerance to extreme environmental conditions, which may lead to the discovery of other thermophilic strains with potential applications in industrial biotechnology.
Highlights
Environmental temperature is one of the most important factors for the growth and survival of microorganisms
Polyphasic taxonomic analysis revealed that strain CBA1119T belonged to the genus Natrinema and was a novel member of the genus Natrinema
Strain CBA1119T grew at a temperature of 20 °C–66 °C; optimal growth was observed at 50 °C–55 °C
Summary
This study we describe strain CBA1119T isolated from solar salt, which has the highest growth temperature and one of the largest genome sizes among all of the haloarchaeal members. We identified and characterized thermophilic strain CBA1119T and investigated the relationship between two strain-specific features, namely growth temperature and genome size
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