Genome analysis of Pseudomonas sp. OF001 and Rubrivivax sp. A210 suggests multicopper oxidases catalyze manganese oxidation required for cylindrospermopsin transformation

• Published in: BMC genomics 2021-06, Vol.22 (1), p.464-464, Article 464
• Main Authors: Martínez-Ruiz, Erika Berenice, Cooper, Myriel, Barrero-Canosa, Jimena, Haryono, Mindia A S, Bessarab, Irina, Williams, Rohan B H, Szewzyk, Ulrich
• Format: Article
• Language: English
• Subjects: Alkaloids; Aromatic compounds; Biodegradation; Biofilms; Biotechnology; Biotransformation; Burkholderiales - enzymology; Burkholderiales - genetics; Calvin cycle; Carbon cycle; Catalysis; Catechol; Copper compounds; CRISPR; Cyanobacteria; Cyanobacteria Toxins; Cyanotoxins; Cylindrospermopsin; Drinking water; Enzymes; Genes; Genetic aspects; Genome, Bacterial; Genomes; Genomic islands; Genomics; Gram-negative bacteria; Leptothrix; Manganese; Manganese-oxidizing bacteria; Metabolic potential; Metabolism; Metabolites; Microbial toxins; Microbiological research; Multicopper oxidase; Oxidase; Oxidases; Oxidation; Oxidation-Reduction; Oxidation-reduction reaction; Oxidoreductases - metabolism; Peroxidase; Phages; Phylogenetics; Physiological aspects; Physiology; Pollutants; Pseudomonas; Pseudomonas - enzymology; Pseudomonas - genetics; Pseudomonas putida; Similarity; Strains (organisms)
• ISSN: 1471-2164; 1471-2164
• DOI: 10.1186/s12864-021-07766-0

Cylindrospermopsin is a highly persistent cyanobacterial secondary metabolite toxic to humans and other living organisms. Strain OF001 and A210 are manganese-oxidizing bacteria (MOB) able to transform cylindrospermopsin during the oxidation of Mn . So far, the enzymes involved in manganese oxidation in strain OF001 and A210 are unknown. Therefore, we analyze the genomes of two cylindrospermopsin-transforming MOB, Pseudomonas sp. OF001 and Rubrivivax sp. A210, to identify enzymes that could catalyze the oxidation of Mn . We also investigated specific metabolic features related to pollutant degradation and explored the metabolic potential of these two MOB with respect to the role they may play in biotechnological applications and/or in the environment. Strain OF001 encodes two multicopper oxidases and one haem peroxidase potentially involved in Mn oxidation, with a high similarity to manganese-oxidizing enzymes described for Pseudomonas putida GB-1 (80, 83 and 42% respectively). Strain A210 encodes one multicopper oxidase potentially involved in Mn oxidation, with a high similarity (59%) to the manganese-oxidizing multicopper oxidase in Leptothrix discophora SS-1. Strain OF001 and A210 have genes that might confer them the ability to remove aromatic compounds via the catechol meta- and ortho-cleavage pathway, respectively. Based on the genomic content, both strains may grow over a wide range of O concentrations, including microaerophilic conditions, fix nitrogen, and reduce nitrate and sulfate in an assimilatory fashion. Moreover, the strain A210 encodes genes which may convey the ability to reduce nitrate in a dissimilatory manner, and fix carbon via the Calvin cycle. Both MOB encode CRISPR-Cas systems, several predicted genomic islands, and phage proteins, which likely contribute to their genome plasticity. The genomes of Pseudomonas sp. OF001 and Rubrivivax sp. A210 encode sequences with high similarity to already described MCOs which may catalyze manganese oxidation required for cylindrospermopsin transformation. Furthermore, the analysis of the general metabolism of two MOB strains may contribute to a better understanding of the niches of cylindrospermopsin-removing MOB in natural habitats and their implementation in biotechnological applications to treat water.