Whole genome sequence analysis of bacteriophage P1 that infects the Lactobacillus plantarum.

Phage P1 was isolated from the abnormal fermented liquid using Lactobacillus plantarum (L. plantarum) IMAU10120. To date, genetic knowledge regarding L. plantarum phage diversity is still limited, and further in-depth sequencing analysis of isolated L. plantarum phages can fill this gap. Here, we investigated the whole genome sequence of L. plantarum phage P1, sequenced by Illumina HiSeq platform, to decipher its genomic characteristics and putative DNA packaging mechanism. It was revealed that phage P1 was 73,787 bp in length, which was composed of linear double-stranded DNA (dsDNA), and the GC content was 39.17%. Its genome contained 86 coding sequences for various functions, such as adsorption, injection, replication, assembly, and release. Moreover, it was observed that L. plantarum phage P1 utilized the 'cohesive ends' DNA packaging mechanism. This study furthered the genomic knowledge of L. plantarum phages and provided some basis for the control of L. plantarum phages in the dairy fermentation industry.