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Effect of the geometry of the central coordination sphere in antitumor trinuclear platinum complexes on DNA binding

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    0104641 - BFU-R 20043023 RIV US eng J - Journal Article
    Kašpárková, Jana - Vrána, Oldřich - Farrell, N. - Brabec, Viktor
    Effect of the geometry of the central coordination sphere in antitumor trinuclear platinum complexes on DNA binding.
    [Vliv geometrie centrální koordinační sféry protinádorově účinných trojjaderných komplexů platiny na jejich vazbu k DNA.]
    Journal of Inorganic Biochemistry. Roč. 98, č. 10 (2004), s. 1560-1569. ISSN 0162-0134. E-ISSN 1873-3344.
    [International Symposium on Platinum Compounds in Cancer Chemotherapy /9./. New York, 08.10.2004-11.10.2004]
    R&D Projects: GA ČR GA305/02/1552; GA AV ČR KJB5004301; GA AV ČR IBS5004009
    Grant - others:National Institutes of Health(US) CA-78754
    Institutional research plan: CEZ:AV0Z5004920
    Keywords : DNA * platinum * antitumor
    Subject RIV: BO - Biophysics
    Impact factor: 2.225, year: 2004

    In the present work the DNA binding of [{trans-PtCl(NH3)2}2m-cis-Pt(NH3)2{H2N(CH2)6NH2}2]4+ (1,0,1/t,c,t) in cell-free media was examined by the methods of molecular biophysics and compared to the binding of 1,0,1/t,t,t. The binding of 1,0,1/t,c,t is slower and less sequence specific. 1,0,1/t,c,t also forms on DNA long-range delocalized intrastrand and interstrand cross-links similarly as 1,0,1/t,t,t, although the frequency of interstrand adducts is markedly enhanced. Importantly, the adducts of 1,0,1/t,c,t distort DNA conformation and are repaired by cell-free extracts considerably more than the adducts of 1,0,1/t,t,t. It has been suggested that the unique properties of long-range interstrand cross-links of bifunctional trinuclear platinum complexes and resulting conformational alterations in DNA have critical consequences for their antitumor effects.

    V této práci byla zkoumána vazba komplexů [{trans-PtCl(NH3)2}2m-cis-Pt(NH3)2{H2N(CH2)6NH2}2]4+ (1,0,1/t,c,t) na DNA v nebuněčném prostředí metodami molekulární biofyziky. Vazba je málo sekvenčně specifická a vede ke vzniku můstků dlouhého dosahu. Bylo navrženo, že unikátní vlastnosti těchto můstků vytvořených bifunkčními trojjadernými komplexy platiny a výsledné změny v konformaci DNA mají kritický význam pro protinádorovou účinnost této třídy komplexů platiny.
    Permanent Link: http://hdl.handle.net/11104/0011907

     
     
Number of the records: 1  

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