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. 1983 Aug 25;11(16):5467–5474. doi: 10.1093/nar/11.16.5467

Isolation and characterisation of DraI, a type II restriction endonuclease recognising a sequence containing only A:T basepairs, and inhibition of its activity by uv irradiation of substrate DNA.

I J Purvis, B E Moseley
PMCID: PMC326291  PMID: 6310500

Abstract

A type II restriction endonuclease, DraI, isolated from Deinococcus radiophilus ATCC 27603 recognises the palindromic hexanucleotide sequence (formula; see text) and cleaves it, as indicated by the arrows, to produce blunt-ended fragments. The yield of enzyme is 100 to 1000 times that of the only other known type II restriction endonuclease that recognises a sequence composed solely of A:T basepairs, the isoschizomer AhaIII (1). Ultraviolet irradiation of the DNA substrate at relatively low doses inhibits the activity of DraI by "protecting" the recognition sequence and this may be exploited to give control of partial digestion of DNA by DraI.

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Selected References

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