Complete genome sequence of Methylobacterium sp. 17Sr1-43, a radiation-resistant bacterium

Abstract

The genus Methylobacterium is composed of a variety of pink-pigmented and facultatively methylotrophic bacteria. Most of the species of these genera have been shown to be either gamma radiation resistant or UV radiation resistant or both. Strain Methylobacterium sp. 17Sr1-43 was isolated from a gamma- irradiated soil sample collected at Seoul Women’s University, South Korea. The complete genome of strain Methylobacterium sp. 17Sr1-43 was sequenced and assembled using Pacific Biosciences RS II system. The genome sequence was annotated using JGI GenePRIMP, Prodigal, and Genomes-Expert Review (IMG-ER) platform. The protein-coding genes were identified using Pfam and COG databases implemented in the IMG and NCBI systems. The complete genome of strain Methylobacterium sp. 17Sr1-43 was found to comprise a complete circular chromosome of 5,539,695 bp, with 5,103 coding sequences (CDs) and 5,186 genes. Many identified genes involved either in DNA repair or the cellular response to ionization radiation. However, contributions by genes involved in cell wall structure/function, cell division, and intermediary metabolism were also evident. Some identified genes were previously have been associated with IR resistance or recovery from IR exposure, including the RecBCD pathway and UmuCD system. The new strains of Methylobacterium sp. 17Sr1-43 showed both gamma and UV-C irradiation resistance, and their complete genome sequence annotation features correspondingly showed the presence of the genes involved in the radiation-resistance.