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Delftia acidovorans SPH-1 is a betaProteobacterium that degrades a number of organic compounds. Genomic islands play the important role in horizontal gene transfer. Two prophage-related genomic islands (GIs), SPHGI-1 and SPHGI-2, were determined and are integrated into 5’ and 3’ end of the tRNA gene (Daci_R0056) that was aligned with D. acidovorans SPH-1 chromosome. The genomic islands that have similar flanking direct repeats and homologous integrases with SPHGI-1 and SPHGI-2 verified in Delftia sp. Cs1-4, Bordetella petrii strain DSM 12804, Pseudomonas stutzeri DSM 4166, and several Pseudomonas aeruginosa strains, respectively. The cutting sites of the integrases in SPHGI-1 and SPHGI-2 that are annotated as DNA breaking-rejoining enzyme and P4 integrase are located inside DHU loop and downstream region of T Ψ C loop, respectively. SPHGI-1, SPHGI-2, and their structure similar GIs should be transfer into many beta-Proteobacterium chromosomes that have highly similar tRNA gene with D. acidovorans SPH-1, and these strains that capture the GIs will obtain new character. Keywords-genomic islands (GIs); Delftia acidovorans SPH-1; tRNAGly-ccc gene; integrase; structure similarity

Structure Analysis of Genomic Islands Flanked by 5’ and 3’ End of the tRNAGly-CCC Gene in Delftia Acidovorans SPH-1