3O62

Nucleosome core particle modified with a cisplatin 1,3-cis-{Pt(NH3)2}2+-d(GpTpG) intrastrand cross-link

Summary for 3O62

• Entry DOI: 10.2210/pdb3o62/pdb
• Descriptor: Histone H3.2, Histone H4, Histone H2A type 1, ... (7 entities in total)
• Functional Keywords: nucleosome, cisplatin, structural protein-dna complex, structural protein/dna
• Biological source: Xenopus laevis (African clawed frog); More
• Cellular location: Nucleus: P84233 P62799 P06897 P02281
• Total number of polymer chains: 10
• Total formula weight: 198407.88

Authors

Lippard, S.J.,Todd, R.C. (deposition date: 2010-07-28, release date: 2011-01-05, Last modification date: 2024-02-21)

Primary citation

Todd, R.C.,Lippard, S.J.
Consequences of Cisplatin binding on nucleosome structure and dynamics.
Chem.Biol., 17:1334-1343, 2010

PubMed Abstract: The effects of cisplatin binding to DNA were explored at the nucleosome level to incorporate key features of the eukaryotic nuclear environment. An X-ray crystal structure of a site-specifically platinated nucleosome carrying a 1,3-cis-{Pt(NH₃)₂}²+-d(GpTpG) intrastrand cross-link reveals the details of how this adduct dictates the rotational positioning of DNA in the nucleosome. Results from in vitro nucleosome mobility assays indicate that a single platinum adduct interferes with ATP-independent sliding of DNA around the octamer core. Data from in vitro transcription experiments suggest that RNA polymerases can successfully navigate along cisplatin-damaged DNA templates that contain nucleosomes, but stall when the transcription elongation complex physically contacts a platinum cross-link located on the template strand. These results provide information about the effects of cisplatin binding to nuclear DNA and enhance our understanding of the mechanism of transcription inhibition by platinum anticancer compounds.

PubMed: 21168769
DOI: 10.1016/j.chembiol.2010.10.018

Experimental method

X-RAY DIFFRACTION (3.216 Å)