Purification of bacteriophage λO protein that specifically binds to the origin of replication

Toshiki Tsurimoto, Kenichi Matsubara

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23 Citations (Scopus)


By means of a nitrocellulose filter binding assay, DNA binding activities among proteins fractionated from extracts of Escherichia coli carrying λdv have been surveyed. An activity was found that binds specifically to a fragment of 164 base pairs that specifies the λ replication origin (λ ori). This activity was not detected in an extract of cells not carrying the λdv plasmid. The activity was detected in extracts of cells carrying a hybrid plasmid in which the entire λ O gene had been cloned and placed under the control of the lac promoter. Deletion of a 60 base pair segment in the 'amino-terminal region' of the O gene abolished this activity, indicating that the λ ori binding protein is coded for by the λ O gene. The ori-specific binding protein was purified by five fractionation steps. The most purified preparation consists of a major polypeptide that migrates with a molecular weight of 32,000 in SDS-polyacrylamide gel electrophoresis. Binding of O protein to ori occurs in the absence of other protein aceous components.

Original languageEnglish
Pages (from-to)325-331
Number of pages7
JournalMolecular and General Genetics
Issue number3
Publication statusPublished - Mar 1981
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Genetics


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