Ben Hania Wajdi, Joseph Manon, Schumann P., Bunk B., Fiebig A., Sproer C., Klenk H. P., Fardeau Marie-Laure, Spring S. (2015). Complete genome sequence and description of Salinispira pacifica gen. nov., sp. nov., a novel spirochaete isolated form a hypersaline microbial mat. Standards in Genomic Sciences, 10, p. art. 7 [14 p.]. ISSN 1944-3277.
Titre du document
Complete genome sequence and description of Salinispira pacifica gen. nov., sp. nov., a novel spirochaete isolated form a hypersaline microbial mat
Année de publication
2015
Auteurs
Ben Hania Wajdi, Joseph Manon, Schumann P., Bunk B., Fiebig A., Sproer C., Klenk H. P., Fardeau Marie-Laure, Spring S.
Source
Standards in Genomic Sciences, 2015,
10, p. art. 7 [14 p.] ISSN 1944-3277
During a study of the anaerobic microbial community of a lithifying hypersaline microbial mat of Lake 21 on the Kiritimati atoll (Kiribati Republic, Central Pacific) strain L21-RPul-D2(T) was isolated. The closest phylogenetic neighbor was Spirochaeta africana Z-7692(T) that shared a 16S rRNA gene sequence identity value of 90% with the novel strain and thus was only distantly related. A comprehensive polyphasic study including determination of the complete genome sequence was initiated to characterize the novel isolate. Cells of strain L21-RPul-D2(T) had a size of 0.2 - 0.25 x 8-9 mu m, were helical, motile, stained Gram-negative and produced an orange carotenoid-like pigment. Optimal conditions for growth were 35 degrees C, a salinity of 50 g/l NaCl and a pH around 7.0. Preferred substrates for growth were carbohydrates and a few carboxylic acids. The novel strain had an obligate fermentative metabolism and produced ethanol, acetate, lactate, hydrogen and carbon dioxide during growth on glucose. Strain L21-RPul-D2(T) was aerotolerant, but oxygen did not stimulate growth. Major cellular fatty acids were C-14:0, iso-C-15:0, C-16:0 and C-18:0. The major polar lipids were an unidentified aminolipid, phosphatidylglycerol, an unidentified phospholipid and two unidentified glycolipids. Whole cell hydrolysates contained L-ornithine as diagnostic diamino acid of the cell wall peptidoglycan. The complete genome sequence was determined and annotated. The genome comprised one circular chromosome with a size of 3.78 Mbp that contained 3450 protein-coding genes and 50 RNA genes, including 2 operons of ribosomal RNA genes. The DNA G + C content was determined from the genome sequence as 51.9 mol%. There were no predicted genes encoding cytochromes or enzymes responsible for the biosynthesis of respiratory lipoquinones. Based on significant differences to the uncultured type species of the genus Spirochaeta, S. plicatilis, as well as to any other phylogenetically related cultured species it is suggested to place strain L21-RPul-D2(T) (=DSM 27196(T) = JCM 18663(T)) in a novel species and genus, for which the name Salinispira pacifica gen. nov., sp. nov. is proposed.
Plan de classement
Biotechnologies [084]
Description Géographique
PACIFIQUE ; KIRIBATI ; KIRITIMATI ATOLL
Localisation
Fonds IRD [F B010066119]
Identifiant IRD
fdi:010066119
