title: Limisphaera ngatamarikiensis gen. nov., sp. nov., a thermophilic, pink-pigmented coccus isolated from subaqueous mud of a geothermal hotspring.
abstract: A novel bacterial strain, NGM72.4(T), 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 Verrucomicrobia and class level group 3 (also known as OPB35 soil group). NGM72.4(T) 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(16 : 0), anteiso-C(15 : 0), iso-C(16 : 0) and anteiso-C(17 : 0). 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(T) 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(-1). Colonies were small, circular and pigmented pale pink. The distinct phylogenetic position and phenotypic traits of strain NGM72.4(T) distinguish it from all other described species of the phylum Verrucomicrobia and, therefore, it is considered to represent a novel species in a new genus for which we propose the name Limisphaera ngatamarikiensis gen. nov., sp. nov. The type strain is NGM72.4(T) ( = ICMP 20182(T) = DSM 27329(T)).
authors.affiliation: Lehrstuhl für Tierhygiene, Technische Universität München, Weihenstephaner Berg 3 0D-85354, Freising, Germany.|GNS Science, Extremophile Research Group, Private Bag 2000, Taupō 3352, New Zealand.
authors.forename: Heike
authors.initials: H
authors.lastname: Anders
authors.affiliation: GNS Science, Extremophile Research Group, Private Bag 2000, Taupō 3352, New Zealand.
authors.forename: Jean F
authors.initials: JF
authors.lastname: Power
authors.affiliation: Callaghan Innovation, PO Box 31310, Lower Hutt 5040, New Zealand.
authors.forename: Andrew D
authors.initials: AD
authors.lastname: MacKenzie
authors.affiliation: Callaghan Innovation, PO Box 31310, Lower Hutt 5040, New Zealand.
authors.forename: Kirill
authors.initials: K
authors.lastname: Lagutin
authors.affiliation: Callaghan Innovation, PO Box 31310, Lower Hutt 5040, New Zealand.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Vyssotski
authors.affiliation: University of Melbourne, 30 Flemington Road, Victoria 3010, Australia.
authors.forename: Eric
authors.initials: E
authors.lastname: Hanssen
authors.affiliation: University of Melbourne, 30 Flemington Road, Victoria 3010, Australia.
authors.forename: John W
authors.initials: JW
authors.lastname: Moreau
authors.affiliation: GNS Science, Extremophile Research Group, Private Bag 2000, Taupō 3352, New Zealand.
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Stott
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000235:genetics; D003960:Diaminopimelic Acid / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry; D045482:Hot Springs / Q000382:microbiology*; D008969:Molecular Sequence Data; D009520:New Zealand; D010457:Peptidoglycan / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry; D010802:Phylogeny; D010858:Pigmentation; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D061327:Verrucomicrobia / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D024482:Vitamin K 2 / Q000031:analogs & derivatives / Q000737:chemistry
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D010457:Peptidoglycan; D010743:Phospholipids; D012336:RNA, Ribosomal, 16S; D024482:Vitamin K 2; D003960:Diaminopimelic Acid; C062629:menaquinone 7