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. 1992 Oct 25;20(20):5351–5356. doi: 10.1093/nar/20.20.5351

Characterization of Chlorella virus PBCV-1 CviAII restriction and modification system.

Y Zhang 1, M Nelson 1, J W Nietfeldt 1, D E Burbank 1, J L Van Etten 1
PMCID: PMC334341  PMID: 1437552

Abstract

A second DNA site-specific (restriction) endonuclease (R.CviAII) and its cognate adenine DNA methyltransferase (M.CviAII) were isolated from virus PBCV-1 infected Chlorella strain NC64A cells. R.CviAII, a heteroschizomer of the bacterial restriction endonuclease NlaIII, recognizes the sequence CATG, and does not cleave CmATG sequences. However, unlike NlaIII, which cleaves after the G and does not cleave either CmATG or mCATG sequences, CviAII cleaves between the C and A and is unaffected by mCATG methylation. The M.CviAII and R.CviAII genes were cloned and their DNA sequences were determined. These genes are tandemly arranged head-to-tail such that the TAA termination codon of the M.CviAII methyltransferase gene overlaps the ATG translational start site of R.CviAII endonuclease. R.CviAII is the first chlorella virus site-specific endonuclease gene to be cloned and sequenced.

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Selected References

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