Bruguierivorax albus gen. nov. sp. nov. Isolated from Mangrove Sediment and Proposal of Bruguierivoracaceae fam. nov

A novel Gram-negative, motile, aerobic rod-shaped bacterium designated BGMRC 2031(T) was isolated from mangrove sediment collected from Guangxi Province, China. Optimal growth occurred at 28 degrees C and pH 7.0-8.0 in the presence of 1% (w/v) NaCl. Alignment based on 16S rRNA gene sequences indicated that strain BGMRC 2031(T) is most closely related to Sodalis praecaptivus HS1(T) (95.6%, sequence similarity), followed by Biostraticola tofi DSM 19580(T) (95.5%), Sodalis glossinidius DSM 16929(T) (95.4%), and Brenneria goodwinii FRB141(T) (94.9%) sequence similarity. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain BGMRC 2031(T) formed a distinct branch in a robust cluster and revealed that strain BGMRC 2031(T), genera Biostraticola and Sodalis, formed a novel family-level clade in the order Enterobacterales. The novel strain showed an average nucleotide similarity of 74.7%, 74.2%, and 73.1% for S. praecaptivus HS1(T), S. glossinidius DSM 16929(T), and B. tofi DSM 19580(T), respectively. The genomes of the BGMRC 2031(T) shared the presence of a riboflavin synthesis gene cluster. The menaquinones of strain BGMRC 2031(T) were MK-8 and Q-8, which were similar to those of genus Biostraticola. The major fatty acids (> 10%) were C-16:0 (19.9%), summed feature 2 (iso-C-16:1 and/or C-14:0 3-OH, 18.10%), summed feature 3 (C-16:1 omega 7c and/or C-16:1 omega 6c, 15.3%), C-12:0 (13.9%), C-17:0 cyclo (11.4%), and C-14:0 (10.4%). The main polar lipids were phosphatidyl methylethanolamine, phosphatidyl glycerol, diphosphatidyl glycerol, phosphatidyl inositol, one unidentified phospholipid, and one unknown polar lipid. The G+C content of strain BGMRC 2031(T) was 55.4%. Strain BGMRC 2031(T) could extend the mean lifespan and maximum lifespan of Caenorhabditis elegans by 4.5% and 12.5%, respectively. Overall, the results of this study indicate that BGMRC 2031(T) is a novel species in a new genus, for which the name Bruguierivorax albus gen. nov. sp. nov. is proposed, and the type of strain is designated as BGMRC 2031(T) (= NBRC 111907(T) = KCTC 52119(T)). In addition, a novel family, Bruguierivoracaceae fam. nov., is proposed to accommodate the genera Bruguierivorax, Biostraticola, and Sodalis.

Automated summary

The study identified a novel bacterium, BGMRC 2031(T), isolated from mangrove sediment in Guangxi Province, China, which showed high sequence similarity with Sodalis praecaptivus HS1(T) and formed a new family-level clade.