Abstract:
:A Gram-negative, spiral-shaped, chemolithotrophic, ammonia-oxidizing bacterium, designated APG3(T), was isolated into pure culture from sandy lake sediment collected from Green Lake, Seattle, WA, USA. Phylogenetic analyses based on the 16S rRNA gene sequence showed that strain APG3(T) belongs to cluster 0 of the genus Nitrosospira, which is presently not represented by described species, with Nitrosospira multiformis (cluster 3) as the closest species with a validly published name (identity of 98.6 % to the type strain). Strain APG3(T) grew at 4 °C but could not grow at 35 °C, indicating that this bacterium is psychrotolerant. Remarkably, the strain was able to grow over a wide range of pH (pH 5-9), which was greater than the pH range of any studied ammonia-oxidizing bacteria in pure culture. The DNA G+C content of the APG3(T) genome is 53.5 %, which is similar to that of Nitrosospira multiformis ATCC 25196(T) (53.9 %) but higher than that of Nitrosomonas europaea ATCC 19718 (50.7 %) and Nitrosomonas eutropha C71 (48.5 %). The average nucleotide identity (ANI) calculated for the genomes of strain APG3(T) and Nitrosospira multiformis ATCC 25196(T) was 75.45 %, significantly lower than the value of 95 % ANI that corresponds to the 70 % species-level cut-off based on DNA-DNA hybridization. Overall polyphasic taxonomy study indicated that strain APG3(T) represents a novel species in the genus Nitrosospira, for which the name Nitrosospira lacus sp. nov. is proposed (type strain APG3(T) = NCIMB 14869(T) = LMG 27536(T) = ATCC BAA-2542(T)).
journal_name
Int J Syst Evol Microbiolauthors
Urakawa H,Garcia JC,Nielsen JL,Le VQ,Kozlowski JA,Stein LY,Lim CK,Pommerening-Röser A,Martens-Habbena W,Stahl DA,Klotz MGdoi
10.1099/ijs.0.070789-0subject
Has Abstractpub_date
2015-01-01 00:00:00pages
242-250issue
Pt 1eissn
1466-5026issn
1466-5034journal_volume
65pub_type
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