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Related Experiment Video

Updated: Feb 20, 2026

Mitigation of Blood Borne Cell Attachment to Metal Implants through CD47-Derived Peptide Immobilization
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Metal-Dependent DNA Recognition and Cell Internalization of Designed, Basic Peptides.

Soraya Learte-Aymamí1, Natalia Curado1, Jéssica Rodríguez1

  • 1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain.

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|October 24, 2017
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Summary

Researchers designed a peptide that selectively binds DNA with palladium. This metal-promoted interaction is reversible and enables peptide entry into cells.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • The GCN4 bZIP transcription factor plays a role in gene regulation.
  • Designing peptides for specific DNA interactions is a key area in molecular biology.

Purpose of the Study:

  • To engineer a peptide with selective DNA-binding capabilities.
  • To investigate metal-dependent and reversible DNA interactions.
  • To explore metal-induced cell internalization of peptides.

Main Methods:

  • Modification of the GCN4 basic region (br) peptide to include histidine residues (brHis2).
  • Assessing DNA binding affinity and selectivity using the consensus target DNA site (5'-GTCAT-3').
  • Utilizing palladium(II) complex (Pd(en)Cl2) to promote peptide-DNA interaction.
  • Investigating reversible complex disassembly with a palladium chelator.
  • Evaluating cell membrane translocation of the peptide with and without the palladium reagent.

Main Results:

  • The modified peptide (brHis2) alone did not bind to the target DNA sequence.
  • Addition of Pd(en)Cl2 resulted in high-affinity and selective binding of brHis2 to the DNA.
  • The peptide-DNA interaction was reversible and could be switched multiple times using palladium complex and chelator.
  • Palladium treatment induced efficient cell internalization of the brHis2 peptide.

Conclusions:

  • A designed peptide can achieve selective, major groove DNA binding.
  • Metal-dependent interactions offer a mechanism for reversible control of DNA binding.
  • Palladium can promote the internalization of basic peptides into cells.