alphaproteobacterium capable of both aerobic and anaerobic anoxygenic photosynthesis but incapable of photoautotrophy: Charonomicrobium ambiphototrophicum, gen. nov., sp. nov

A facultatively aerobic deep brown coccoid to ovoid bacterium, strain EG17T, was isolated from a saline effluent stream in the NaCl-dominated brine spring system known as East German Creek in the province of Manitoba, Canada. The strain produced BChl a incorporated into a functional reaction center...

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Bibliographic Details
Published in:Photosynthesis research 2011-03, Vol.107 (3), p.257-268
Main Authors: Csotonyi, J. T, Stackebrandt, E, Swiderski, J, Schumann, P, Yurkov, V
Format: Article
Language:English
Subjects:
AAP
Aerobic anoxygenic phototorphs
Aerobiosis
Alphaproteobacteria - chemistry
Alphaproteobacteria - classification
Alphaproteobacteria - physiology
Anaerobiosis
Analysis
Anoxygenic photosynthesis
autotrophs
Bacteria
Bacteriochlorophyll a
Biochemistry
Biomedical and Life Sciences
Charonomicrobium ambiphototrophicum
Culture Techniques
DNA, Bacterial - chemistry
Life Sciences
Oxygen
Photosynthesis
Phylogeny
Physiological aspects
Phytochemistry
Pigmentation
Plant Genetics and Genomics
Plant Physiology
Plant Sciences
Regular Paper
Rhodospirillaceae
RNA
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Summary:A facultatively aerobic deep brown coccoid to ovoid bacterium, strain EG17T, was isolated from a saline effluent stream in the NaCl-dominated brine spring system known as East German Creek in the province of Manitoba, Canada. The strain produced BChl a incorporated into a functional reaction center and two light-harvesting complexes with absorption peaks at 802, 850, and 879 nm. EG17T is the first reported anoxygenic phototroph capable of photoheterotrophic growth under both oxic and anoxic conditions. It yielded proportionally the greatest aerobic photosynthetic biomass under oligotrophic conditions. The results of 16S rRNA gene sequence comparisons revealed that EG17T was related most closely to the aerobic anoxygenic phototrophs Roseibacterium elongatum (98.3%) and quite distantly to both Dinoroseobacter shibae (95.2%) and Roseicyclus mahoneyensis (94.7%). The DNA G + C content was 65.6 mol%. On the basis of the unique dual aerobic/anaerobic photosynthetic capability, the distinctive spectrophotometric absorption of the photosynthetic apparatus, diagnostic physiological and biochemical traits, and the moderate phylogenetic separation between EG17T and its nearest relatives, it is concluded that this microorganism should be classified as a novel genus and species, Charonomicrobium ambiphototrophicum gen. nov., sp. nov., with EG17T as the type strain.
ISSN:0166-8595
1573-5079
DOI:10.1007/s11120-011-9629-1