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. 1983 Nov;80(22):6834–6837. doi: 10.1073/pnas.80.22.6834

Sequence-specific double-strand cleavage of DNA by penta-N-methylpyrrolecarboxamide-EDTA X Fe(II).

P G Schultz, P B Dervan
PMCID: PMC390080  PMID: 6417654

Abstract

In the presence of O2 and 5 mM dithiothreitol, penta-N-methylpyrrolecarboxamide-EDTA X Fe(II) [P5E X Fe(II)] at 0.5 microM cleaves pBR322 plasmid DNA (50 microM in base pairs) on opposite strands to afford discrete DNA fragments as analyzed by agarose gel electrophoresis. High-resolution denaturing gel electrophoresis of a 32P-end-labeled 517-base-pair restriction fragment containing a major cleavage site reveals that P5E X Fe(II) cleaves 3-5 base pairs contiguous to a 6-base-pair sequence, 5'-T-T-T-T-T-A-3' (4,323-4,328 base pairs). The major binding orientation of the pentapeptide occurs with the amino terminus at the adenine side of this sequence. In the presence of 5 mM dithiothreitol, 0.01 microM P5E X Fe(II) converts form I pBR322 DNA at 0.22 microM plasmid (1.0 mM in base pairs) to 40% form II, indicating the cleavage reaction is catalytic, turning over a minimum of nine times. This synthetic molecule achieves double-strand cleavage of DNA (pH 7.9, 25 degrees C) at the 6-base-pair recognition level and may provide an approach to the design of "artificial restriction enzymes".

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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