Bacillus rigiliprofundi sp. nov., an endospore-forming, Mn-oxidizing, moderately halophilic bacterium isolated from deep subseafloor basaltic crust. Academic Article uri icon


  • A facultatively anaerobic bacterium, designated strain 1MBB1T, was isolated from basaltic breccia collected from 341 m below the seafloor by seafloor drilling of Rigil Guyot during Integrated Ocean Drilling Program Expedition 330. The cells were straight rods, 0.5 m wide and 1-3 m long, that occurred singly and in chains. Strain 1MBB1T stained Gram-positive. Catalase and oxidase were produced. The isolate grew optimally at 30 C and pH 7.5, and could grow with up to 12 % (w/v) NaCl. The DNA G+C content was 40.5 mol%. The major cellular fatty acids were C16:111c (26.5 %), anteiso-C15:0 (19.5 %), C16:0 (18.7 %) and iso-C15:0 (10.4 %), and the cell-wall diamino acid was meso-diaminopimelic acid. Endospores of strain 1MBB1T oxidized Mn(II) to Mn(IV), and siderophore production by vegetative cells was positive. Phylogenetic analysis of the 16S rRNA gene indicated that strain 1MBB1T was a member of the family Bacillaceae, with Bacillus foraminis CV53T and Bacillus novalis LMG 21837T being the closest phylogenetic neighbours (96.5 and 96.2 % similarity, respectively). This is the first novel species described from deep subseafloor basaltic crust. On the basis of our polyphasic analysis, we conclude that strain 1MBB1T represents a novel species of the genus Bacillus, for which we propose the name Bacillus rigiliprofundi sp. nov. The type strain is 1MBB1T (= NCMA B78T =LMG 28275T).

published proceedings

  • Int J Syst Evol Microbiol

altmetric score

  • 0.25

author list (cited authors)

  • Sylvan, J. B., Hoffman, C. L., Momper, L. M., Toner, B. M., Amend, J. P., & Edwards, K. J.

citation count

  • 22

complete list of authors

  • Sylvan, Jason B||Hoffman, Colleen L||Momper, Lily M||Toner, Brandy M||Amend, Jan P||Edwards, Katrina J

publication date

  • June 2015