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Applied and Environmental Microbiology, December 2007, p. 7858-7866, Vol. 73, No. 24
0099-2240/07/$08.00+0 doi:10.1128/AEM.01630-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
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Alimentary Pharmabiotic Centre and Department of Microbiology, University College Cork, Western Road, Cork, Ireland
Received 17 July 2007/ Accepted 30 September 2007
The 2.1-kb cryptic plasmid pCIBAO89 from Bifidobacterium asteroides harbors a 1.4-kb segment which is sufficient for its autonomous replication. The segment is divided into two parts, the presumed replication origin, ori89, and the rep gene encoding the putative 41-kDa Rep89 replication initiation protein. This minimal replication region of pCIBAO89 was functionally dissected by transcriptional analyses as well as by DNA-binding studies, and the information obtained was exploited to create a number of Escherichia coli-Bifidobacterium shuttle vectors capable of transforming various bifidobacteria with an efficiency of up to 106 transformants/µg DNA.
Published ahead of print on 26 October 2007.
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