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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Studying the Interaction between Bendamustine and DNA Molecule with SERS Based on AuNPs/ZnCl2/NpAA Solid-State

Lina Yao1, Yanjie Li1, Zhenzhong Zuo1

  • 1State Key Laboratory of Cultivation Base for Photoelectric Technology and Functional Materials, National Center for International Research of Photoelectric Technology & Nano-Functional Materials and Application, Key Laboratory of Photoelectronic Technology of Shaanxi Province, Institute of Photonics and Photon-Technology, Northwest University, Xi'an 710127, China.

International Journal of Molecular Sciences
|September 9, 2023
PubMed
Summary

Bendamustine (BENDA) interacts with DNA through covalent bonding and hydrogen bonds, primarily binding to the N7 atom of guanine. This study elucidates BENDA-DNA interactions at a single-molecule level, aiding new drug development.

Keywords:
bendamustinecalf thymus DNAdrug–DNA interactionsolid-state substratesurface-enhanced Raman spectroscopy

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • Bendamustine (BENDA) is a bifunctional alkylating agent used in cancer therapy.
  • Its anticancer effects stem from DNA binding, but the precise interaction mechanism remains unclear.
  • Understanding BENDA-DNA interactions is crucial for developing safer, more effective cancer drugs.

Purpose of the Study:

  • To systematically investigate the interaction properties between bendamustine (BENDA) and calf thymus DNA (ctDNA).
  • To elucidate the mechanism of BENDA-DNA interaction at a single-molecule level.
  • To provide guidance for the development of novel anticancer drugs with reduced toxicity.

Main Methods:

  • Surface-enhanced Raman spectroscopy (SERS) using a novel AuNPs/ZnCl2/NpAA substrate.
  • Ultraviolet-visible (UV-Vis) spectroscopy.
  • Molecular docking simulations.

Main Results:

  • SERS and UV-Vis spectroscopy revealed characteristic spectral changes in ctDNA upon interaction with BENDA.
  • Analysis of different molar concentrations (1:1, 2:1, 3:1) indicated distinct binding modes, including covalent binding and hydrogen bonding.
  • Molecular docking identified the N7 atom of guanine as the primary binding site for BENDA on DNA.

Conclusions:

  • The study successfully elucidated the interaction mechanism between bendamustine and DNA at the molecular level.
  • The findings highlight covalent and hydrogen bonding as key interaction modes, with a specific binding site on guanine.
  • This research provides a foundation for designing improved bendamustine-based therapies with enhanced efficacy and minimized side effects.