Cloning and characterization of genes for the PvuI restriction and modification system.
AUTOR(ES)
Smith, M D
RESUMO
The genes encoding the endonuclease and the methylase of the PvuI restriction and modification system were cloned in E.coli and characterized. The genes were adjacent in tandem orientation spanning a distance of 2200 bases. The PvuI endonuclease was a single polypeptide with a calculated molecular weight of 27,950 daltons. The endonuclease was easily detectable when the gene was expressed from its endogenous promotor and present on a low copy plasmid, but expression was considerably enhanced when the endonuclease gene was placed under the control of a strong promoter on a high copy plasmid. The methylase did not completely protect plasmid DNA from R.PvuI digestion until the methylase gene was placed under lac promotor control in a multicopy plasmid. In the absence of the M.PvuI methylase, expression of the R.PvuI endonuclease from the lac promotor on a multicopy plasmid was not lethal to wild type E.coli, but was lethal in a temperature-sensitive ligase mutant at the non-permissive temperature. Moreover, induction of the R.PvuI endonuclease under lambda pL promotor control resulted in complete digestion of the E.coli chromosome by R.PvuI.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=334411Documentos Relacionados
- Cloning and characterization of the genes encoding the MspI restriction modification system.
- Cloning, characterization and heterologous expression of the SmaI restriction-modification system.
- Cloning and expression of the BalI restriction-modification system.
- Cloning and characterization of the MboII restriction-modification system.
- Cloning, sequencing and expression of the Taq I restriction-modification system.
