Transposition of the Streptococcus lactis ssp. lactis Z270 lactose plasmid to pVA797: demonstration of an insertion sequence and its relationship to an inverted repeat sequence isolated by self-annealing.

Abstract:

:The lactose plasmid pUCL22 of the single plasmid strain Streptococcus lactis ssp. lactis Z270 was demonstrated to fuse with the heterologous conjugative plasmid pVA797. The fusion of pUCL22 with pVA797 occurred by recombination between a specific sequence of pUCL22 and different sites of pVA797. The cointegrates of pUCL22::pVA797 were unstable: in the absence of lactose selection, they segregated plasmids that corresponded to pVA797 enlarged by one sequence of 1.2 kb, common to all derivative plasmids. This resolution sequence (RS) was shown to originate in the 9.7 kb BstEII restriction fragment of pUCL22 and to duplicate during replicon fusion. In addition, after nuclease S1 treatment of pUCL22 DNA, a self-annealing sequence was isolated; the two copies of this inverted repeat (IR) sequence were located on the 18 kb BamHI segment of the plasmid. This latter sequence was distinct from the RS with which it hybridized weakly. The RS was responsible for the transposition of the entire lactose plasmid; the role of the IR remains to be elucidated.

journal_name

Biochimie

journal_title

Biochimie

authors

Novel M,Huang DC,Novel G

doi

10.1016/0300-9084(88)90091-0

subject

Has Abstract

pub_date

1988-04-01 00:00:00

pages

543-51

issue

4

eissn

0300-9084

issn

1638-6183

pii

0300-9084(88)90091-0

journal_volume

70

pub_type

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