Functional characterization of a replication initiator protein.

Abstract:

:Functional domains in the RepI replication initiator protein have been identified by classical and site-directed mutagenesis techniques. Mutations conferring an increase in plasmid copy number contained alterations in a key position of a putative helix-turn-helix DNA binding motif. The mutations did not appear to affect autorepressing functions. Regions of RepI important for autorepression were localized as well. Two classes of mutations resulting in diminished autorepression functions were identified. One class was distinguished by an elevated copy number, while the other class remained at the wild-type copy number level. Analysis of the various mutations leading to changes in copy number or autorepressing functions suggest that in some cases the autorepression and initiating functions of the RepI protein are separable. Finally, analysis with deletion clones suggests that the trans-acting autorepressing functions of RepI might depend on intermolecular coupling control.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Gammie AE,Tolmasky ME,Crosa JH

doi

10.1128/jb.175.11.3563-3569.1993

subject

Has Abstract

pub_date

1993-06-01 00:00:00

pages

3563-9

issue

11

eissn

0021-9193

issn

1098-5530

journal_volume

175

pub_type

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