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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 75, Issue 1

First genome sequence of a purple sulphur bacterium of the genus , its characterization as a new isolate of and proposal of strain Um2 as neotype of this species No Access

Abstract

A new alkaliphilic strain of a purple sulphur bacterium designated as Um2 (=KCTC 25734=VKM B-3893=UQM 41073) with bacteriochlorophyll and internal photosynthetic membranes of tubular type was isolated from the Umhei hydrothermal system (40 °C, pH 9.3 and salinity 0.42 g l) located in the Baikal rift zone (Russia). Based on morphological and physiological characteristics, this bacterium was classified as . The 16S rRNA gene sequence similarity of strain Um2 was 96.69% with the type strain of A26, 95.41% with ‘’ 8321 and 95.34% with 4250. The level of similarity of the ribulose 1,5-bisphosphate carboxylase sequences of strain Um2 and known strains of showed that they belong to the same species. Comparison of the genome nt sequences of strain Um2 revealed that the new isolate was remote from all other described species both in digital DNA–DNA hybridization (21.5%) and in average nt identity (76.7%) at the genus level. However, a genome nt sequence had not been determined for any of the known strains; therefore, the first genome sequence of a member of the genus is presented here. Um2 is proposed as the neotype, as strain A26 has been lost from culture collections.

  • Received:
  • Accepted:
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Keyword(s): bacteriochlorophyll b , purple sulphur bacteria , taxonomy , Thioalkalicoccus , tubular internal photosynthetic membranes and whole genome
Funding
This study was supported by the:
  • Wilson Enhancement Fund for Applied Research in Science at Bellevue University.
    • Principal Award Recipient: A. BryantsevaIrina
© 2025 The Authors
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2025-01-31
2025-11-08

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/content/journal/ijsem/10.1099/ijsem.0.006657
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First genome sequence of a purple sulphur bacterium of the genus Thioalkalicoccus, its characterization as a new isolate of Thioalkalicoccus limnaeus and proposal of strain Um2 as neotype of this species
Int J Syst Evol Microbiol 75, 006657 (2025); https://doi.org/10.1099/ijsem.0.006657
/content/journal/ijsem/10.1099/ijsem.0.006657
/content/journal/ijsem/10.1099/ijsem.0.006657
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