Fusion of GFP to the M.EcoKI DNA methyltransferase produces a new probe of Type I DNA restriction and modification enzymes.
Fusion of GFP to the M.EcoKI DNA methyltransferase produces a new probe of Type I DNA restriction and modification enzymes.
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DOI:
10.1016/j.bbrc.2010.06.069
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发表时间:
2010-07-23
影响因子:
3.1
通讯作者:
Dryden, David T. F.
中科院分区:
文献类型:
--
作者:
Chen, Kai;Roberts, Gareth A.;Stephanou, Augoustinos S.;Cooper, Laurie P.;White, John H.;Dryden, David T. F.
关键词:
► Successful fusion of GFP to M.EcoKI DNA methyltransferase. ► GFP located at C-terminal of sequence specificity subunit does not later enzyme activity. ► FRET confirms structural model of M.EcoKI bound to DNA. We describe the fusion of enhanced green fluorescent protein to the C-terminus of the HsdS DNA sequence-specificity subunit of the Type I DNA modification methyltransferase M.EcoKI. The fusion expresses well in vivo and assembles with the two HsdM modification subunits. The fusion protein functions as a sequence-specific DNA methyltransferase protecting DNA against digestion by the EcoKI restriction endonuclease. The purified enzyme shows Förster resonance energy transfer to fluorescently-labelled DNA duplexes containing the target sequence and to fluorescently-labelled ocr protein, a DNA mimic that binds to the M.EcoKI enzyme. Distances determined from the energy transfer experiments corroborate the structural model of M.EcoKI.
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