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The complete nucleotide sequence of the multicopy Streptomyces plasmid pIJ101 has been determined and correlated with previously published genetic data. The circular DNA molecule is 8,830 nucleotides in length and has a G+C composition of 72.98%. The use of a computer program, FRAME, enabled identification in the sequence of seven open reading frames, four of which, tra (621 amino acids [aa]), spdA (146 aa), spdB (274 aa), and kilB (177 aa), appear to be genes involved in plasmid transfer. At least two of the above genes are predicted to be transcribed by known promoters that are regulated in trans by the products of the korA (241 aa) and korB (80 aa) loci on the plasmid. The segment of the plasmid capable of autonomous replication contains one large open reading frame (rep; 450 aa) and a noncoding region presumed to be the origin of replication. Four other small (less than 90 aa) open reading frames are also present on the plasmid, although no function can be attributed to them. The sequence of the pIJ101 replication segment present in several widely used cloning vectors (e.g., pIJ350 and pIJ702) has also been determined, so that the complete nucleotide sequences of these vectors are now known.

Complete nucleotide sequence of the Streptomyces lividans plasmid pIJ101 and correlation of the sequence with genetic properties