- International Journal of Systematic and Evolutionary Microbiology
- Volume 49, Issue 3
f Caldivirga maquilingensis gen. nov., sp. nov., a new genus of rod-shaped crenarchaeote isolated from a hot spring in the Philippines
- Authors: Takashi Itoh, Ken-ichiro Suzuki, Priscilla C. Sanchez, Takashi Nakase
- Author for correspondence: Takashi Itoh. Tel: +81 48 467 9560. Fax: +81 48 462 4617. e-mail: email@example.com
- First Published Online: 01 July 1999, International Journal of Systematic and Evolutionary Microbiology 49: 1157-1163, doi: 10.1099/00207713-49-3-1157
- Subject: New Taxa - Archaea
- Issue Published:
Two novel hyperthermophilic, rod-shaped crenarchaeotes were isolated from an acidic hot spring in the Philippines. Cells were mostly straight or slightly curved rods 0·4-0·7 μm in width. Bent cells, branched cells, and cells bearing globular bodies were commonly observed. The isolates were heterotrophs and grew anaerobically and microaerobically. The addition of archaeal cell extract or a vitamin mixture to the medium significantly stimulated growth. The isolates grew over a temperature range of 60-92 °C, and optimally around 85 °C and grew over a pH range of 2·3-6·4, and optimally at pH 3·7-4·2. The isolates utilized glycogen, gelatin, beef extract, peptone, tryptone and yeast extract as carbon sources. They required sulfur, thiosulfate or sulfate as electron acceptors. The lipids mainly consisted of various cyclized glycerolbisdiphytanyl-glycerol tetraethers. The G+C content of the genomic DNAs was 43 mol%. The 16S rDNA contained two small introns. The comparison of the 16S rDNA exon sequences revealed that they represented an independent lineage in the family Thermoproteaceae. The two strains were included in a single species because of high levels of DNA-DNA relatedness. From these results, Caldivirga maquilingensis gen. nov., sp. nov. is proposed in the family Thermoproteaceae to accommodate these isolates. The type strain of C. maquilingensis is strain IC-167T (= JCM 10307T =MCC-UPLB 1200T = ANMR 0178T).
The DDBJ accession number for the 16S rDNA sequence of Caldivirga maquilingensis IC-167T is AB013926.
Copyright © 1999 International Union of Microbiological Societies | Published by the Microbiology Society
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