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Title: Elioraea tepida, sp. nov., a Moderately Thermophilic Aerobic Anoxygenic Phototrophic Bacterium Isolated from the Mat Community of an Alkaline Siliceous Hot Spring in Yellowstone National Park, WY, USA

Journal Article · · Microorganisms
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [3];  [2]; ORCiD logo [2];  [1];  [4]; ORCiD logo [2]
  1. Tokyo Metropolitan University (Japan)
  2. Pennsylvania State University, University Park, PA (United States)
  3. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  4. Tokyo Metropolitan University (Japan); Pennsylvania State University, University Park, PA (United States); DSMZ-German Culture Collection of Microorganisms and Cell Cultures, Braunschweig (Germany)

Strain MS-P2T was isolated from microbial mats associated with Mushroom Spring, an alkaline siliceous hot spring in Yellowstone National Park, WY, USA. The isolate grows chemoheterotrophically by oxygen-dependent respiration, and light stimulates photoheterotrophic growth under strictly oxic conditions. Strain MS-P2T synthesizes bacteriochlorophyll a and the carotenoid spirilloxanthin. However, photoautotrophic growth did not occur under oxic or anoxic conditions, suggesting that this strain should be classified as an aerobic anoxygenic phototrophic bacterium. Strain MS-P2T cells are motile, curved rods about 0.5 to 1.0 μm wide and 1.0 to 1.5 μm long. The optimum growth temperature is 45–50 °C, and the optimum pH for growth is circum-neutral (pH 7.0–7.5). Sequence analysis of the 16S rRNA gene revealed that strain MS-P2T is closely related to Elioraea species, members of the class Alphaproteobacteria, with a sequence identity of 96.58 to 98%. The genome of strain MS-P2T is a single circular DNA molecule of 3,367,643 bp with a mol% guanine-plus-cytosine content of 70.6%. Based on phylogenetic, physiological, biochemical, and genomic characteristics, we propose this bacteriochlorophyll a-containing isolate is a new species belonging to the genus Elioraea, with the suggested name Elioraeatepida. The type-strain is strain MS-P2T (= JCM33060T = ATCC TSD-174T).

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Institute of Fermentation, Osaka (IFO); National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES); Tokyo Metropolitan Government
Grant/Contract Number:
FG02-94ER20137; NNX16AJ62G
OSTI ID:
1981165
Journal Information:
Microorganisms, Vol. 10, Issue 1; ISSN 2076-2607
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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