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Biosci Biotechnol Biochem. 2005 Feb;69(2):422-5.

Structural and functional analysis of pTB6 from Bifidobacterium longum.

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Department of Molecular Genetics, Institute of Molecular and Cellular Biology for Pharmaceutical Sciences, Kyoto Pharmaceutical University, Japan.


The complete nucleotide sequence for pTB6 (3,624 bp) from Bifidobacterium longum was determined. This plasmid is 95% homologous in nucleotide (nuc) sequence, and also 92% in RepB aa sequence, to rolling circle replication (RCR) plasmids pKJ36 and pB44, suggesting that pTB6 replicates by the rolling circle mechanism. The putative MembB, MobA, and protein encoding from orf (Orf) I detected were nonessential for plasmid replication. We constructed an immobile shuttle vector from pTB6 and pUC18, which transformed B. longum with a high efficiency of 2.5 x 10(6) transformants/microg DNA.

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