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Volume 65, Issue Pt_4

gen. nov., sp. nov., a thermophilic, pink-pigmented coccus isolated from subaqueous mud of a geothermal hotspring Free

Abstract

A novel bacterial strain, NGM72.4, was isolated from a hot spring in the Ngatamariki geothermal field, New Zealand. Phylogenetic analysis based on 16S rRNA gene sequences grouped it into the phylum and class level group 3 (also known as OPB35 soil group). NGM72.4 stained Gram-negative, and was catalase- and oxidase-positive. Cells were small cocci, 0.5–0.8 µm in diameter, which were motile by means of single flagella. Transmission electron micrograph (TEM) imaging showed an unusual pirellulosome-like intracytoplasmic membrane. The peptidoglycan content was very small with only trace levels of diaminopimelic acid detected. No peptidoglycan structure was visible in TEM imaging. The predominant isoprenoid quinone was MK-7 (92 %). The major fatty acids (>15 %) were C, anteiso-C, iso-C and anteiso-C. Major phospholipids were phosphatidylethanolamine (PE), phosphatidylmonomethylethanolamine (PMME) and cardiolipin (CL), and a novel analogous series of phospholipids where diacylglycerol was replaced with diacylserinol (sPE, sPMME, sCL). The DNA G+C content was 65.6 mol%. Cells displayed an oxidative chemoheterotrophic metabolism. NGM72.4 is a strictly aerobic thermophile (growth optimum 60–65 °C), has a slightly alkaliphilic pH growth optimum (optimum pH 8.1–8.4) and has a NaCl tolerance of up to 8 g l. Colonies were small, circular and pigmented pale pink. The distinct phylogenetic position and phenotypic traits of strain NGM72.4 distinguish it from all other described species of the phylum and, therefore, it is considered to represent a novel species in a new genus for which we propose the name gen. nov., sp. nov. The type strain is NGM72.4 ( = ICMP 20182 = DSM 27329).

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Funding
This study was supported by the:
  • GNS Science
© 2015 IUMS
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2015-04-01
2024-04-20
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Limisphaera ngatamarikiensis gen. nov., sp. nov., a thermophilic, pink-pigmented coccus isolated from subaqueous mud of a geothermal hotspring
Int J Syst Evol Microbiol 65, 1114 (2015); https://doi.org/10.1099/ijs.0.000063
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