Gene A Protein Cleavage of Recombinant Plasmids Containing the Phi X174 Replication Origin
Overview
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Synthetic oligonucleotides, DNA ligase and DNA polymerase were used to construct double-stranded DNA fragments homologous to the first 25, 27 or 30 b.p. of the origin of replication of bacteriophage phi X174 (nucleotides 4299-4328 of the phi X174 DNA sequence). The double-stranded DNA fragments were cloned into the unique SmaI or HindIII restriction sites in the kanamycin-resistance gene of pACYC177 (AmpR, KmR). Recombinant plasmids were picked up by colony hybridization. DNA sequencing showed that not only recombinant plasmids with the expected insert were formed, but also recombinant plasmids with a shorter insert. Recombinant plasmids with an insert homologous to the first 24, 25, 26, 27, 28 or all 30 b.p. of the phi X174 origin region were thus obtained. Supercoiled plasmids containing a sequence homologous to the first 27, 28 or 30 b.p. of the phi X174 origin region are nicked by the phi X174 gene A protein. However, the other supercoiled plasmids are not nicked by the phi X174 gene A protein. These results show that the first 27 b.p. of the phi X174 origin region are sufficient as well as required for the initiation step in phi X174 RF DNA replication, i.e. the cleavage by gene A protein.
Effect of SSB protein on cleavage of single-stranded DNA by phi X gene A protein and A* protein.
van Mansfeld A, van Teeffelen H, Fluit A, Baas P, Jansz H Nucleic Acids Res. 1986; 14(4):1845-61.
PMID: 2937018 PMC: 339577. DOI: 10.1093/nar/14.4.1845.
Replication and incompatibility properties of plasmid pUB110 in Bacillus subtilis.
Maciag I, Viret J, Alonso J Mol Gen Genet. 1988; 212(2):232-40.
PMID: 2841567 DOI: 10.1007/BF00334690.
A probe for the detection of methicillin-resistant Staphylococcus aureus.
Fluit A, Box A, Verhoef J Eur J Clin Microbiol Infect Dis. 1990; 9(8):605-8.
PMID: 2209628 DOI: 10.1007/BF01967216.