A filamentous bacteriophage from Vibrio cholerae O139 strain A1-4450 was isolated (fsl). The phage fsl had a ssDNA genome and dsDNA as a replicative form (RF) in lysogenic host cell. The DNA sequence of fsl RF was determined. It consisted of 6340 bp and had a G + C content of 43.5%. Fifteen possible ORFs were found in fsl. One of them, ORF384, was estimated to encode 384 amino acid residues (44.6 kDa) and had homologous regions with the zot gene of V. cholerae and gene I of the coliphage group. ORF104, located upstream of ORF384, was homologous to gene 93 protein of Pf3 (filamentous phage of Pseudomonas sp.) corresponding to gene VI of coliphage. Other than ORF384 and ORF104, the ORF81, ORF44, ORF29, and ORF193 were speculated to correspond to gene V, gene VII, gene IX, and gene III, respectively, in the order as reported on f1 phage.
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