2.4 A crystal structure of an oxaliplatin 1,2-d(GpG) intrastrand cross-link in a DNA dodecamer duplex.
نویسندگان
چکیده
(1R,2R-Diaminocyclohexane)oxalatoplatinum(II) (oxaliplatin) is a third-generation platinum anticancer compound that produces the same type of inter- and intrastrand DNA cross-links as cisplatin. In combination with 5-fluorouracil, oxaliplatin has been recently approved in Europe, Asia, and Latin America for the treatment of metastatic colorectal cancer. We present here the crystal structure of an oxaliplatin adduct of a DNA dodecanucleotide duplex having the same sequence as that previously reported for cisplatin (Takahara, P. M.; Rosenzweig, A. C.; Frederick, C. A.; Lippard, S. J. Nature 1995, 377, 649-652). Pt-MAD data were used to solve this first X-ray structure of a platinated DNA duplex derived from an active platinum anticancer drug other than cisplatin. The overall geometry and crystal packing of the complex, refined to 2.4 A resolution, are similar to those of the cisplatin structure, despite the fact that the two molecules crystallize in different space groups. The platinum atom of the [Pt(R,R-DACH)](2+) moiety forms a 1,2-intrastrand cross-link between two adjacent guanosine residues in the sequence 5'-d(CCTCTGGTCTCC), bending the double helix by approximately 30 degrees toward the major groove. Both end-to-end and end-to-groove packing interactions occur in the crystal lattice. The latter is positioned in the minor groove opposite the platinum cross-link. A novel feature of the present structure is the presence of a hydrogen bond between the pseudoequatorial NH hydrogen atom of the (R,R)-DACH ligand and the O6 atom of the 3'-G of the platinated d(GpG) lesion. This finding provides structural evidence for the importance of chirality in mediating the interaction between oxaliplatin and duplex DNA, calibrating previously published models used to explain the reactivity of enantiomerically pure vicinal diamine platinum complexes with DNA in solution. It also provides a new kind of chiral recognition between an enantiomerically pure metal complex and the DNA double helix.
منابع مشابه
Crystal Structure of an Oxaliplatin 1,2-d(GpG) Intrastrand Cross-link in a DNA Dodecamer Duplex
(1R,2R-Diaminocyclohexane)oxalatoplatinum(II) (oxaliplatin) is a third generation platinum anticancer compound that produces the same type of interand intrastrand DNA cross-links as cisplatin. In combination with 5-fluorouracil, oxaliplatin has been recently approved in Europe, Asia, and Latin America for the treatment of metastatic colorectal cancer. We present here the crystal structure of an...
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The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Synopsis The structure of a cisplatin-modified DNA dodecamer duplex containing a 1,2-cis-{Pt(NH 3) 2 } 2+-d(GpG) cross-link has been determined at 1.77-Å resolution. Improved electron density reveals new features not seen in the originally published 2.6 Å structure. Abstract We...
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Intrastrand DNA adducts formed by cisplatin and oxaliplatin were modeled with molecular mechanics minimization and restrained molecular dynamics simulations in a comparative study. A reasonable set of force field parameters for the Pt atom were refined by using the available cisplatinated DNA crystal structure as a guide. This crystal structure was also used as the starting structure for the si...
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عنوان ژورنال:
- Inorganic chemistry
دوره 40 22 شماره
صفحات -
تاریخ انتشار 2001