Abstract
In this study, we conducted a genome-wide comparative analysis of a former Rhodobacter sphaeroides strain EBL0706, which is now recorded as Luteovulum sphaeroides EBL0706. The genome of EBL0706 was compared with that of Luteovulum azotoformans ATCC 17025, Luteovulum azotoformans KA25, and Luteovulum sphaeroides 2.4.1. The average nucleotide identity (ANI), tetra nucleotide signatures (Tetra), digital DNA–DNA hybridization (dDDH) values, comparative genome, and phylogenetic analysis proposed that EBL0706 is a strain of Luteovulum azotoformans. Functional annotations identified a total of 4034 protein-coding genes in the genome of EBL0706, including a complete photosynthetic gene cluster. This study provides genomic molecular verification for the strain EBL0706 to be reclassified to Luteovulum azotoformans.
Highlights
The Rhodobacter genus is comprised of heterogenous members showing flexibility in ecophysiology and metabolic capability [1,2,3]
ANIb and
The ANI value of strain EBL0706 against that of L. sphaeroides was down to 84.7–85%, indicating strain EBL0706 was phylogenetically close to L. azotoformans
Summary
The Rhodobacter genus is comprised of heterogenous members showing flexibility in ecophysiology and metabolic capability [1,2,3]. Rhodobacter species have been model organisms for studying bacterial photosynthesis [7]. Their single photosynthetic system consists of the light-harvesting complex I (LH1), the light-harvesting complex II (LH2), and the reaction center (RC) [8,9], showing structural and functional similarities to the light system II of higher plants [10]. This is not the case, for sodium benzoate and sodium tartrate (Table S1) [11]. In the NCBI database, the Luteovulum genus currently contains six species: Luteovulum sphaeroides, Luteovulum johrii, Luteovulum ovatum, Luteovulum azotoformans, Luteovulum alkalitolerans, and Luteovulum changlensis. Rhodobacter sphaeroides strain EBL0706 is currently classified and deposited in the NCBI database as Luteovulum sphaeroides EBL0706.
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