Heliothrix oregonensis, gen. nov., sp. nov., a phototrophic filamentous gliding bacterium containing bacteriochlorophyll a
An unusual filamentous, gliding bacterium was found in a few hot springs in Oregon where it formed a nearly unispecific top layer of microbial mats. It contained a bacteriochlorophyll a-like pigment and an abundance of carotenoids. There were no chlorosomes or additional chlorophylls. The organism was aerotolerant and appeared to be photoheterotrophic. It was successfully co-cultured with an aerobic chemoheterotroph in a medium containing glucose and casamino acids. Although it has many characteristics in common with the genus Chloroflexus, the lack of chlorosomes and bacteriochlorophyll c and the aerobic nature of this organism indicate that it should be placed in a new genus. This conclusion is supported by 5S rRNA nucleotide sequence data.
Key wordsHeliothrix Bacteriochlorophyll a Gliding motility Filamentous Phototrophic Thermophilic Hot springs 5S rRNA Nucleotide sequence homologies Chloroflexus
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- Castenholz RW (1984) Composition of hot spring microbial mats: a summary. In: Cohen Y, Castenholz RW, Halvorson HO (eds) Microbial mats: Stromatolites. Alan R Liss, New York, pp 101–109Google Scholar
- Dams E, Vanderberghe A, DeWachter R (1983) Sequences of the 5S rRNAs of Azotobacter vinelandii, Pseudomonas aeruginosa and Pseudomonas fluorescens with some notes on 5S RNA secondary structure. Nucleic Acids Res 11:1245–1252Google Scholar
- Erdmann VA, Huysmans E, Vanderberghe A, DeWachter R (1983) Collection of published 5S and 5.8 S ribosomal RNA sequences. Nucleic Acids Res 11:105–133Google Scholar
- Pierson BK, Castenholz RW (1971) Bacteriochlorophylls in gliding filamentous prokaryotes from hot springs. Nature (New Biology) 233:25–27Google Scholar
- Pierson BK, Castenholz RW (1974) A phototrophic gliding filamentous bacterium of hot springs, Chloroflexus aurantiacus, gen. and sp. nov. Arch Microbiol 100:5–24Google Scholar
- Pierson BK, Howard HM (1972) Detection of bacteriochlorophyll-containing micro-organisms by infrared fluorescence photomicrography. J Gen Microbiol 73:359–363Google Scholar
- Pierson BK, Giovannoni SJ, Castenholz RW (1984) Physiological ecology of a gliding bacterium containing bacteriochlorophyll a. Appl Environ Microbiol 47:576–584Google Scholar
- Stahl DA, Lane DJ, Olsen GJ, Pace NR (1984) Analysis of hydrothermal vent-associated symbionts by ribosomal RNA sequences. Science 224:409–411Google Scholar