Nucleic Acids Research, 1978, Vol. 5, No. 9 3231-3236
© 1978
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MspI, an isoschizomer of HpaII which cleaves both unmethylated and methylated HpaII sites
Section for Medical Enzymology and Molecular Biology, Laboratory of Biochemistry, University of Amsterdam P.O. Box 60.000, 1005 GA Amsterdam, Netherlands
Received May 24, 1978. The cleavage of DNA by restriction endonucleases HpaII and HapII is prevented by the presence of a 5-methyl group at the internal C residue of its recognition sequence CCGG. MspI, an isoschizomer of HpaII available from New England Biolabs, cleaves DNA irrespective of the presence of a methyl group at this position. This enzyme cleaves DNA from Haemophilus parainfluenzae and Haemophilus aphrophilus readily while HpaII and HapII cannot degrade these DNAs. Practically all HpaII sites in mammalian sperm DNA are also protected by methylation at the internal C position since HpaII and HapII barely cleave this DNA (average molecular weight 40 kb). MspI, however, cleaves the DNA to an average size of about 5 kb.
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