Sequence-selective DNA cleavage by a chimeric metallopeptide

Journal of the American Chemical Society
Roger T KovacicSonya J Franklin

Abstract

A chimeric metallopeptide derived from the sequences of two structurally superimposable motifs was designed as an artificial nuclease. Both DNA recognition and nuclease activity have been incorporated into a small peptide sequence. P3W, a 33-mer peptide comprising helices alpha2 and alpha3 from the engrailed homeodomain and the consensus EF-hand Ca-binding loop binds one equivalent of lanthanides or calcium and folds upon metal binding. The conditional formation constants (in the presence of 50 mM Tris) of P3W for Eu(III) (K(a) = (2.1 +/- 0.1) x 10(5) M(-1)) and Ce(IV) (K(a) = (2.6 +/- 0.1) x 10(5) M(-1)) are typical of isolated EF-hand peptides. Circular dichroism studies show that 1:1 CeP3W is 26% alpha-helical and EuP3W is up to 40% alpha-helical in the presence of excess metal. The predicted helicity of the folded peptide based on helix length and end effects is about 50%, showing the metallopeptides are significantly folded. EuP3W has considerably more secondary structure than our previously reported chimeras (Welch, J. T.; Sirish, M.; Lindstrom, K. M.; Franklin, S. J. Inorg. Chem. 2001, 40, 1982-1984). Eu(III)P3W and Ce(IV)P3W nick supercoiled DNA at pH 6.9, although EuP3W is more active at pH 8. CeP3W cleaves linearized,...Continue Reading

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