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@article{955330,
author = {Suchánková, Tereza and Kubíček, Karel and Kašpárková, Jana and Brabec, Viktor and Kozelka, Jiří},
article_location = {New York, USA},
article_number = {1},
doi = {http://dx.doi.org/10.1016/j.jinorgbio.2011.09.025},
keywords = {Anticancer drugs; Cisplatin; DNA binding; Interstrand crosslinks; Lone pair-pi interactions; Molecular dynamics simulations},
language = {eng},
issn = {0162-0134},
journal = {Journal of Inorganic Biochemistry},
title = {Platinum-DNA interstrand crosslinks: Molecular determinants of bending and unwinding of the double helix.},
volume = {108},
year = {2012}
}
TY - JOUR
ID - 955330
AU - Suchánková, Tereza - Kubíček, Karel - Kašpárková, Jana - Brabec, Viktor - Kozelka, Jiří
PY - 2012
TI - Platinum-DNA interstrand crosslinks: Molecular determinants of bending and unwinding of the double helix.
JF - Journal of Inorganic Biochemistry
VL - 108
IS - 1
SP - 69-79
EP - 69-79
PB - Elsevier Science Inc
SN - 01620134
KW - Anticancer drugs
KW - Cisplatin
KW - DNA binding
KW - Interstrand crosslinks
KW - Lone pair-pi interactions
KW - Molecular dynamics simulations
N2 - Platinum diamine complexes are able to crosslink the guanines of d(GC)2 dinucleotides within double-stranded DNA. The interstrand crosslink thus formed causes a bend of the double helix toward the minor groove and the helical sense changes locally to left-handed, resulting in a considerable unwinding. The bend and unwinding angles have been shown to depend on the platinum ligands. Here, we have used molecular dynamics simulations to investigate the DNA 20-mer d(C1T2C3T4C5C6T7T8G*9C10T11C12T13C14C15T16T17C18T19C20)-d(G21A22G23A24A25G26G27A28G29A30G*31C32A33A34G35G36A37G38A39G40) with the G* guanines crosslinked by cis-Pt(NH3)22+, Pt(R,R-DACH)2+, or Pt(S,S-DACH)2+. Previous investigations on cisplatin interstrand adducts indicated that the structure is similar in solid state and in solution; thus, we used the reported X-ray structure of a cisplatin adduct as a starting model. Replacing in the MD-relaxed model for the DNA duplex crosslinked with cis-Pt(NH3)22+ the two NH3 platinum ligands by R,R-DACH or S,S-DACH led to clashes between the DACH residue and the deoxyribose of C12. Confrontation of MD-derived models with gel shift measurements suggested that these clashes are avoided differently in the adducts of Pt(R,R-DACH)2+versus Pt(S,S-DACH)2+. The R,R-isomer avoids the clash by untwisting the T11/A30–C12/G29 step, thus increasing the global unwinding. In contrast, the S,S-isomer modifies the shift and slide parameters of this step, which dislocates the helical axis and enhances the bend angle. The clash that leads to the differentiation of the structures as a function of the diamine ligand is related to a hydrogen bond between the platinum complex and the T11 base and could be characteristic of interstrand crosslinks at d(pyG*Cpy)-d(puG*Cpu) sequences.
ER -
SUCHÁNKOVÁ, Tereza, Karel KUBÍČEK, Jana KAŠPÁRKOVÁ, Viktor BRABEC and Jiří KOZELKA. Platinum-DNA interstrand crosslinks: Molecular determinants of bending and unwinding of the double helix. \textit{Journal of Inorganic Biochemistry}. New York, USA: Elsevier Science Inc, 2012, vol.~108, No~1, p.~69-79. ISSN~0162-0134. Available from: https://dx.doi.org/10.1016/j.jinorgbio.2011.09.025.
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