Abstract
The complete nucleotide sequence of a new cryptic plasmid pAR67 isolated from a rumen bacteriumRuminococcus albusAR67 has been determined. The plasmid pAR67 was 3419 bp in size with a 45% GC content. Two open reading frames, ORF1 and ORF2, encoding potential polypeptides of 285 and 165 amino acids, with limited sequence similarity to replication and mobilization proteins, respectively, were identified within the sequence. The region upstream of ORF1 had an AT-rich (80%) segment followed by four 19-bp direct repeats, which is similar to the structural organization characteristic of replication origins of some bacterial plasmids.
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