A small part (bases from position
1 to 1238) of the JG004 genome has a twice to three times higher coverage by sequence reads compared to the rest of the genome (Additional file 2, Figure S1). This high coverage could be either an artifact of 454 sequencing or it indicates that this region might be present in multiple copies in the genome as a repetitive sequence. One possible arrangement Pinometostat concentration could be a linear genome, which is flanked with the genome region (bases from 1 to 1238) at both ends. This is supported by the identification of 116 reads, which start exactly at the same position (position 1 in our submitted sequence; Additional file 2, Figure S2). Also, at the end of this part (position 1238), check details we identified 55 sequence reads which all stop at the same position indicating the endpoint of a linear genome (Additional file 2, Figure S3). This data suggests that the 1238 bp fragment is present at the beginning and the end of the genome. To verify whether this part of the genome is present in one or multiple copies and to assess the chromosomal structure, we amplified this part of the genome by PCR using primers
which bind outside of the putative repetitive sequence at the respective 5′ and 3′-flanking regions. Assuming a circular genome we amplified the region using a primer which binds at position 1279 (primer 2; Additional file 2, Figure S4) and one primer which binds at position 92971 (primer 5; Additional file 2, Figure S4). Both primers generated a PCR product of 1300 bp, which corresponds to only one copy of the genome region 1 to 1238, confirming the 454 sequence data (Additional file 2, Figure S4). Moreover, we sequenced the PCR product and again confirmed the 454 sequence data. This Terminal deoxynucleotidyl transferase result only indicates that the JG004
genome does not contain two consecutive copies of the putative repetitive sequence. The investigation of the linearity of the JG004 genome following treatment with exonuclease Bal31 , which degrades only double-stranded linear DNA, gave inconsistent results for the genome of JG004. We decided to integrate only one copy of the region from position 1 to 1238. Annotation of the JG004 sequence identified 161 putative coding sequences and a GC content of 49.26% (Table 2; Additional file 1, Table S1). The general characteristics of the phage genome are summarized in Table 2. Table 2 General DAPT supplier features of the JG004 genome Feature Genome JG004 Genome size 93,017 bp G+C content (G+C content host) 49,26% (68%) No. of predicted CDSs 161 Predicted tRNAs tRNAGlu; tRNAPhe; tRNAGly; tRNAPro; tRNAAsn; tRNACys; tRNAAsp; tRNAIle; tRNALeu; tRNALys; tRNAArg; tRNAGln % of genome with non-coding regions 11.3% The presence of genes coding for tRNAs was investigated using the tool tRNAscan-SE 1.21 . With this software, we were able to identify twelve tRNAs in the genome of JG004, which are summarized in Table 2 and Additional file 1, Table S1.