Natronolimnohabitans

Abstract

Abstract Na.tro.no.lim.no.ha'bi.tans. Arabic n. natrun or natron , soda, sodium carbonate; Gr. fem. n. limne , lake; L. masc. n. habitans , an inhabitant; N.L. masc. n. Natronolimnohabitans , an organism living in soda lakes. Euryarchaeota / Halobacteria / Natrialbales / Natrialbaceae / Natronolimnohabitans The genus Natronolimnohabitans represents a currently monospecies alkaliphilic haloarchaeon inhabiting hypersaline soda lakes. Initially, the type species was placed in the genus Natronolimnobius mainly based on the phylogenetic relatedness inferred from the 16S rRNA gene sequence similarities. However, later on, it was reclassified to the current genus, Natronolimnohabitans , based on the results of more advanced phylogenomic analyses. Cells are rod‐shaped and nonmotile. Gram‐stain‐negative, and red‐pigmented. Obligate aerobic, and oxidase‐ and catalase‐positive. Extremely halophilic with a growth Na + range between 2.5 and 4.5 M (optimum at 3.5 M). Cells lyse in less than 0.5 M NaCl. Obligately alkaliphilic with a growth pH range between 7.5 to 10.0 (optimum at 9.5). Mesophilic or thermotolerant (optimal growth at 45°C). Chemoorganotrophic, utilizing mostly organic acids as carbon and energy source. The major polar lipids are diphytanyl (C20:C20) and phytanyl‐sesterterpanyl (C20:C25) diether derivatives of phosphatidylglycerol (PG) and phosphatidylglycerophosphate methyl ester (PGP‐Me). The major respiratory quinones are MK‐8 and MK‐8(H 2 ). Isolates have been obtained from soda lakes. DNA G + C content (mol%) : 63.1 (HPLC), 64.3 (genome). Type species : Sorokin et al. 2020 VP (basonym: Natronolimnobius innermongolicus Itoh et al. 2005, VL105).