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Background  Comparatively little information is available on members of the  Myoviridae  infecting low G+C content, Gram-positive host bacteria of the family Firmicutes. While numerous  Bacillus  phages have been isolated up till now only very few  Bacillus cereus  phages have been characterized in detail.    Results  Here we present data on the large, virulent, broad-host-range  B. cereus  phage vB_BceM_Bc431v3 (Bc431v3). Bc431v3 features a 158,618 bp dsDNA genome, encompassing 239 putative open reading frames (ORFs) and, 20 tRNA genes encoding 17 different amino acids. Since pulsed-field gel electrophoresis indicated that the genome of this phage has a mass of 155-158 kb Bc431v3 DNA appears not to contain long terminal repeats that are found in the genome of  Bacillus  phage SPO1.    Conclusions  Bc431v3 displays significant sequence similarity, at the protein level, to  B. cereus  phage BCP78,  Listeria  phage A511 and  Enterococcus  phage ØEF24C and other morphologically related phages infecting Firmicutes such as  Staphylococcus  phage K and  Lactobacillus  phage LP65. Based on these data we suggest that Bc431v3 should be included as a member of the  Spounavirinae;  however, because of all the diverse taxonomical information has been addressed recently, it is difficult to determine the genus. The Bc431v3 phage contains some highly unusual genes such as gp143 encoding putative tRNA His  guanylyltransferase. In addition, it carries some genes that appear to be related to the host sporulation regulators. These are: gp098, which encodes a putative segregation protein related to FstK/SpoIIIE DNA transporters; gp105, a putative segregation protein; gp108, RNA polymerase sigma factor F/B; and, gp109 encoding RNA polymerase sigma factor G.

Genome sequence and analysis of a broad-host range lytic bacteriophage that infects the Bacillus cereus group