How Does Cis-Platin Affect DNA Replication?

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SUMMARY

Cisplatin significantly impacts DNA replication by binding to DNA and forming cross-links, which inhibit the unwinding of the DNA helix. This interference primarily occurs at the guanine bases, where cisplatin alters the typical three hydrogen bonds formed with cytosine, reducing them to one. The mechanism of action of cisplatin is crucial for understanding its role in cancer treatment, as it prevents proper DNA replication and ultimately leads to cell death. For a detailed visual explanation, refer to the resource provided in the discussion.

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  • Understanding of DNA structure and replication processes
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  • Basic concepts of biochemistry related to DNA interactions
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elemis
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Before I ask my question, I would like to state that I am not a Biology student. I am actually a Chemistry student who has a small section on Biochemistry in his syllabus.

Now, my problem lies with part (ii).

Mechloroethamine obviously hold the DNA strands together and prevents the DNA helix from uncurling/unzipping. Hence, the very first stage in replication is impeded.

How cis-platin affects DNA replication is eluding me. I know that Guanine normally forms 3 hydrogen bonds with Cytosine. However, it seems to be forming only one hydrogen bond in this case.

Could someone prod me in the correct direction ?
 

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