Abstract
The complete type II restriction-modification system of Salmonella infantis was cloned in Escherichia coli as an R . Sau3AI fragment of 3,430 base pairs. The clone was shown to express the restriction endonuclease as well as the modification methylase. The nucleotide sequence of the above fragment showed two open reading frames of 461 and 230 codons in tail-to-tail orientation. These were shown to represent the modification methylase M . SinI and the restriction endonuclease R . SinI, respectively. The methylase M . SinI amino acid sequence revealed a considerable similarity to those of other deoxycytidylate methylases. In contrast, endonuclease R . SinI did not exhibit such a similarity to other restriction enzymes.
MeSH Terms
Amino Acids/analysis
Base Sequence
Cloning, Molecular
Codon
DNA Restriction Enzymes/metabolism
DNA-Cytosine Methylases
Deoxyribonucleases, Type II Site-Specific
Methyltransferases/metabolism
Molecular Sequence Data
Plasmids
Salmonella/genetics
Software
Transcription, Genetic
Chemicals
Amino Acids
Codon
DNA modification methylase M.SinI
DNA-Cytosine Methylases
Methyltransferases
DNA Restriction Enzymes
Deoxyribonucleases, Type II Site-Specific
GGWCC-specific type II deoxyribonucleases
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Karreman C
Department of Medical Biochemistry, Sylvius Laboratories, University of Leiden, The Netherlands.
de Waard A
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