Cloned restriction/modification system from Pseudomonas aeruginosa

Gingeras, T. R., Brooks, J. E. (1983) Cloned restriction/modification system from Pseudomonas aeruginosa. Proceedings of the National Academy of Sciences of the United States of America, 80 (2). pp. 402-406. ISSN 00278424 (ISSN)

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DNA fragments from Pseudomonas aeruginosa carrying the PaeR7 restriction/modification genes have been cloned in the plasmid vector pBR322 and propagated in Escherichia coli. A subclone (pPAORM3.8) has been constructed that contains the complete restriction/modification system on a 3.8-kilobase DNA fragment. Digestion of the pPAORM3.8 plasmid with nuclease BAL-31 has yielded two types of clones. One type contains an active methylase gene but no active endonuclease gene; such clones will modify the DNA but not restrict the growth of incoming phage in vivo. The second type contains an active endonuclease gene but no active methylase gene, as judged both by in vivo tests and by the activity of the cell extracts in vitro. Although extracts of cells containing these plasmids display restriction endonuclease activity, these bacteria are unable to restrict the growth of incoming phage. Furthermore, chromosomal and phage DNA isolated from these host cells are not protected against cleavage by PaeR7 in vitro. The properties of PaeR7 endonuclease and methylase enzymes have also been examined. The PaeR7 restriction endonuclease recognizes and cleaves the sequence C decreased T-C-G-A-G, as does Xho I. However, there exists a canonical Xho I site at 26.5% on the adenovirus 2 genome which is totally refractory to PaeR7 cleavage but is cut by Xho I. Under conditions of low salt, high glycerol, and high enzyme concentrations, a "PaeR7" activity is found that is similar to that observed for EcoRI. Finally, evidence is presented that the PaeR7 methylase modifies the adenine residue within the recognition sequence.

Item Type: Paper
Uncontrolled Keywords: bacterial DNA restriction endonuclease article Escherichia coli genetics molecular cloning nucleotide sequence plasmid Pseudomonas aeruginosa Base Sequence Cloning, Molecular DNA Restriction Enzymes DNA Bacterial Plasmids
Subjects: organism description > bacteria
Investigative techniques and equipment > cloning
Investigative techniques and equipment > assays > cloning
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > restriction enzyme
CSHL Authors:
Communities: CSHL labs > Gingeras lab
Depositing User: CSHL Librarian
Date: 1983
Date Deposited: 14 Mar 2012 15:04
Last Modified: 30 Sep 2019 19:48
PMCID: PMC393385
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