Restriction endonuclease isoschizomers ItaI, BsoFI and Fsp4HI are characterised by differences in their sensitivities to CpG methylation.

Abstract:

:BsoFI , ItaI and Fsp4HI are isoshizomers of Fnu4HI (5'-GC NGC-3'). Both Fnu4HI and BsoFI have previously been shown to be inhibited by cytosine-specific methylation within the recognition sequence. Fnu4HI is inhibited if either the internal cytosine at position 2 or the external cytosine at position 5 of the restriction sequence is methylated, but the precise nature of the methylation sensitivity of BsoFI is unclear from the literature. The methylation sensitivities of ItaI and Fsp4HI have not previously been reported. By methylating the plasmid pUC18 with M.SssI (a DNA cytosine-5'-methyltransferase with a specificity for CpG), we have determined that ItaI is sensitive only to methylation of internal CpG sites within the restriction sequence. The methylation sensitivity of Fsp4HI is identical to that of Fnu4HI, being inhibited by methylation of either internal CpG sites or overlapping CpG sites. BsoFI , like the other isoschizomers tested, is sensitive to a combination of internal and overlapping CpG methylation. BsoFI is also sensitive to overlapping CpG methylation (in the absence of internal CpG methylation) if CpG overlap with both sides of the recognition sequence. Sites containing one overlapping CpG (in the absence of internal CpG) are cut when methylated but show marked individual variation in their rates of cleavage. Considerable variation in the rate of cleavage by BsoFI is also observed at sites containing only internal methylated CpG. Some sites are cut slowly, whilst others fail to cut even after prolonged incubation with excess of enzyme.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Ramsahoye BH,Burnett AK,Taylor C

doi

10.1093/nar/25.16.3196

subject

Has Abstract

pub_date

1997-08-15 00:00:00

pages

3196-8

issue

16

eissn

0305-1048

issn

1362-4962

pii

gka543

journal_volume

25

pub_type

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