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Abstract
The genus Gemmobacter grows phototrophically, aerobically, or anaerobically, and utilizes methylated amine. Here, we present two high-quality complete genomes of the strains con4 and con5T isolated from a culture of Anabaena. The strains possess sMMO (soluble methane monooxygenase)-oxidizing alkanes to carbon dioxide. Functional genes for methane-oxidation (prmAC, mimBD, adh, gfa, fdh) were identified. The genome of strain con5T contains nirB, nirK, nirQ, norB, norC, and norG genes involved in dissimilatory nitrate reduction. The presence of nitrite reductase gene (nirK) and the nitric-oxide reductase gene (norB) indicates that it could potentially use nitrite as an electron acceptor in anoxic environments. Taxonomic investigations were also performed on two strains through polyphasic methods, proposing two isolates as a novel species of the genus Gemmobacter. The findings obtained through the whole genome analyses provide genome-based evidence of complete oxidation of methane to carbon dioxide. This study provides a genetic blueprint of Gemmobacter fulva con5T and its biochemical characteristics, which help us to understand the evolutionary biology of the genus Gemmobacter.
Highlights
Gemmobacter is of interest because of its metabolic pathways and its habitats
InInthis thestrains strains con5 an Anabaena culture belonging to the genus were investigated using genomic from an Anabaena culture belonging to theGemmobacter, genus Gemmobacter, were investigated using and polyphasic methods
Tand its biochemical characstudy provides a genetic blueprint of Gemmobacter fulva con5
Summary
Gemmobacter is of interest because of its metabolic pathways and its habitats. Members of the Gemmobacter species are able to grow phototrophically, aerobically, and anaerobically [1,2,3,4,5,6]. The first species, Gemmobacter changlensis, isolated from a snow sample collected in the Indian Himalayas, was proposed as psychrotolerant and phototrophic bacteria [1]. Another phototrophically growing species, Gemmobacter aestuarii, recovered from estuarine surface water, was described as containing a complete gene cluster for photosynthesis [3]. These species have related genes encoding the enzymes trimethylamine (TMA) dehydrogenase, TMA monooxygenase, and TMA demethylase in their genome, indicating metabolic potential of using the TMA oxidation pathway to convert trimethylamine to dimethylamine [3,8].
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