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Interaction of histone H1 with cis-platinum modified DNA

E G Paneva1, N C Spassovska, K C Grancharov

  • 1Institute of Molecular Biology, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Zeitschrift Fur Naturforschung. C, Journal of Biosciences
|April 7, 1998
PubMed

Insights

The anticancer drug cisplatin (cis-DDP) binds to DNA, and histone H1 protein preferentially interacts with DNA damaged by cis-DDP compared to its isomer trans-DDP.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • Cis-diamminedichloroplatinum(II) (cis-DDP) is a platinum-based chemotherapy agent with established efficacy against various cancers.
  • The therapeutic action of cis-DDP is primarily attributed to its covalent interaction with cellular DNA, leading to DNA damage and apoptosis.
  • Specific cellular proteins exhibit selective binding to DNA modified by cis-DDP, distinguishing it from its isomer, trans-DDP.

Purpose of the Study:

  • To investigate the interaction between the linker histone H1 and DNA fragments modified by cis-diamminedichloroplatinum(II) (cis-DDP) and its isomer trans-DDP.
  • To provide experimental evidence regarding the preferential binding of histone H1 to cis-DDP-modified DNA structures.

Main Methods:

  • Preparation of DNA fragments modified with cis-DDP and trans-DDP.
  • Experimental analysis of the binding affinity and specificity of linker histone H1 to these modified DNA fragments.

Main Results:

  • Histone H1 demonstrated preferential binding to DNA fragments modified by cis-DDP.
  • The binding of histone H1 to trans-DDP modified DNA fragments was significantly less pronounced compared to cis-DDP modified DNA.
  • These findings highlight the distinct conformational changes induced in DNA by cis- and trans-DDP and their differential recognition by histone H1.

Conclusions:

  • Linker histone H1 exhibits a preference for binding to DNA that has been distorted by cis-diamminedichloroplatinum(II) (cis-DDP) adducts.
  • This preferential interaction suggests a role for histone H1 in recognizing and potentially responding to cis-DDP-induced DNA damage.
  • The differential binding provides new insights into the molecular mechanisms underlying cis-DDP's anticancer activity and cellular responses to platinum-based chemotherapy.

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