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Electroeluting DNA Fragments
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Published on: September 5, 2010

Sequence-selective DNA cleavage by a chimeric metallopeptide.

Roger T Kovacic1, Joel T Welch, Sonya J Franklin

  • 1Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.

Journal of the American Chemical Society
|May 29, 2003
PubMed
Summary
This summary is machine-generated.

This study introduces a novel artificial nuclease, a chimeric metallopeptide (LnP3W), designed for DNA cleavage. This peptide exhibits sequence-selective DNA cutting, marking a significant advancement in artificial enzyme design.

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Area of Science:

  • Bioinorganic Chemistry
  • Peptide Design
  • Nucleic Acid Chemistry

Background:

  • Development of artificial nucleases is crucial for molecular biology and biotechnology.
  • Chimeric peptides offer a platform for designing novel functional biomolecules.
  • Lanthanide-metal binding peptides can be engineered for specific catalytic activities.

Purpose of the Study:

  • To design and characterize a novel chimeric metallopeptide (P3W) as an artificial nuclease.
  • To investigate the DNA binding and cleavage activity of lanthanide-P3W complexes.
  • To assess the sequence selectivity and mechanism of DNA cleavage by the artificial nuclease.

Main Methods:

  • Peptide synthesis and characterization of a 33-mer peptide (P3W) incorporating DNA-binding motifs.
  • Metal ion binding studies using lanthanides (Eu(III), Ce(IV)) and calcium (Ca).
  • Circular dichroism spectroscopy to determine peptide secondary structure upon metal binding.
  • DNA cleavage assays using supercoiled and linearized plasmid DNA, and a labeled DNA fragment.
  • Analysis of DNA cleavage products to determine termini and mechanism.

Main Results:

  • The P3W peptide binds lanthanides and calcium, exhibiting conditional formation constants typical of EF-hand peptides.
  • Metal-bound P3W (EuP3W, CeP3W) shows significant alpha-helical content, indicating successful folding upon metal binding.
  • EuP3W and CeP3W effectively nick supercoiled DNA and cleave linearized DNA, with EuP3W being more active at pH 8.
  • DNA cleavage by CeP3W exclusively produces 3'-OPO(3) and 5'-OPO(3) termini, suggesting a regioselective mechanism.
  • The metallopeptide displays modest sequence discrimination in DNA cleavage, unlike free metal ions.

Conclusions:

  • The de novo designed LnP3W metallopeptide functions as an active and sequence-selective artificial nuclease.
  • This represents the first small, underivatized peptide with combined nuclease activity and sequence specificity.
  • The folded metallopeptide domain likely mediates DNA binding and selective cleavage.