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We improved upon the previously reported draft genome of  Hydrogenophaga intermedia  strain PBC, a 4-aminobenzenesulfonate-degrading bacterium, by supplementing the assembly with Nanopore long reads which enabled the reconstruction of the genome as a single contig. From the complete genome, major genes responsible for the catabolism of 4-aminobenzenesulfonate in strain PBC are clustered in two distinct genomic regions. Although the catabolic genes for 4-sulfocatechol, the deaminated product of 4-aminobenzenesulfonate, are only found in  H. intermedia , the  sad  operon responsible for the first deamination step of 4-aminobenzenesulfonate is conserved in various  Hydrogenophaga  strains. The absence of  pabB  gene in the complete genome of  H. intermedia  PBC is consistent with its  p -aminobenzoic acid (pABA) auxotrophy but surprisingly comparative genomics analysis of 14  Hydrogenophaga  genomes indicate that pABA auxotrophy is not an uncommon feature among members of this genus. Of even more interest, several  Hydrogenophaga  strains do not possess the genomic potential for hydrogen oxidation, calling for a revision to the taxonomic description of  Hydrogenophaga  as “hydrogen eating bacteria.”

frontiers in microbiology

Nanopore Long-Read Guided Complete Genome Assembly of Hydrogenophaga intermedia, and Genomic Insights into 4-Aminobenzenesulfonate, p-Aminobenzoic Acid and Hydrogen Metabolism in the Genus Hydrogenophaga