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Bis[platinum(II)] and bis[platinum(IV)] complexes with optically active bis(vicinal-1,2-diamines) and their interaction with DNA.

Abstract：

:Bis[platinum(II)] [Cl2Pt(LL)PtCl2] complexes 2,5 and 8 with chiral non-racemic ligands: 1a-c (LL = (R,R), (S,S) and (R,S) N,N'-bis(3,4-diaminobutyl)hexanediamide); 4a,b (LL = (R,R) and (S,S) N,N'-bis[3,4-bis(diaminobutyl)] urea); 7a-d (LL' = (R,R), (S,S), (R,S) and (S,R) 4,5-diamino-N-(3,4-diaminobutyl) pentanamide) and bis[platinum(IV)] complex 10-13 with ligands 1a,b and 4a,b have been prepared and characterized by IR, 1H, 13C and 195Pt NMR spectra. The interactions of 2a-c, 5a, 5b, 8a-d and 10a with dsDNA were investigated with the goal of examining whether the chirality, the nature of the spacer and the oxidation state have an influence on platinum-DNA binding properties. All the bis[platinum(II)] complexes form with dsDNA intra- and interstrand crosslinks and crosslinks over sticky ends, whereas the bis[platinum(IV)] complex 10a only forms intra- and interstrand crosslinks. The platinum-DNA coordination sites were determined by the T4 DNA polymerase footprinting method. The results show that all investigated bis(platinum) complexes have high preference towards distinct purines. All isomeric bis(amide) 2a-c and mono(amide) 8a-d complexes exhibit nearly the same binding pattern, whereas the ureide complexes 5a and 5b have other coordination sites with higher sequence preference. Interestingly, the ureides 5a and 5b differ in their coordination sites not only in comparison to the bis(amides) 2a-c and mono(amides) 8a-d, but also between each other. The bis[platinum(IV)] complex 10a also differs in coordination sites in comparison to all the bis[platinum(II)] compounds.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Büning H,Altman J,Zorbas H,Beck W

doi

10.1016/s0162-0134(99)00099-9

subject

Has Abstract

pub_date

1999-07-15 00:00:00

pages

269-79

issue

4

eissn

0162-0134

issn

1873-3344

pii

S0162013499000999

journal_volume

75

pub_type

杂志文章

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