Elsevier

Plasmid

Volume 20, Issue 2, September 1988, Pages 158-162
Plasmid

Short communication
Characterization of a plasmid isolated from Branhamella catarrhalis and detection of plasmid sequences within the genome of a B. catarrhalis strain

https://doi.org/10.1016/0147-619X(88)90020-0Get rights and content

Abstract

We isolated a 12.2-kb plasmid from two clinical strains of Branhamella catarrhalis and evaluated its distribution among other B. catarrhalis strains by colony hybridization experiments using the whole plasmid as a probe. Homology was detected with the two plasmid-bearing strains and also with a third B. catarrhalis strain named E7, which is plasmidless. Southern transfer analysis of total digested E7 DNA using the purified plasmid as a probe revealed a single band of hybridization, different from those observed in plasmid-bearing strains, for each restriction enzyme used. The region of the plasmid hybridizing with DNA of strain E7 was located within a 4.5-kb SstI-EcoRV fragment. No homology was noted between our B. catarrhalis plasmid and about 20 other strains of different genera tested by colony hybridization.

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    Present address: Molecular Biology Department, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.

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