2950-89-2Relevant academic research and scientific papers
Design, synthesis, and biological activity of hybrid compounds between uramustine and DNA minor groove binder distamycin A
Baraldi, Pier Giovanni,Romagnoli, Romeo,Guadix, Antonio Entrena,Pineda de las Infantas, Maria Josè,Gallo, Miguel Angel,Espinosa, Antonio,Martinez, Alberto,Bingham, John P.,Hartley, John A.
, p. 3630 - 3638 (2007/10/03)
The design, synthesis, characterization, DNA binding properties, and cytotoxic activity of a novel series of hybrids, namely, a molecular combination of the natural antibiotic distamycin A and the antineoplastic agent uramustine, are reported, and the structure-activity relationships are discussed. This homologous series 29-34 consisted of the minor groove binder distamycin A joined to uramustine (uracil mustard) by suitable aliphatic carboxylic acid moieties containing a flexible polymethylene chain that is variable in length [(CH2)n, where n = 1-6). All the hybrid compounds in this series exhibit enhanced activity compared to both distamycin A and uramustine derivatives 22-27 used for conjugation, giving IC50 values in the range 7.26-0.07 μM following a 1 h exposure of human leukemic K562 cells, with maximal activity shown when n = 6. The distance between the uramustine and distamycin frame is crucial for the cytotoxicity, with compounds having linker lengths of four to six being at least 20-fold more cytotoxic than liker lengths one to three. Taq polymerase stop experiments demonstrated selective covalent binding of uramustine-distamycin hybrids to A/T rich DNA sequences, which was again more efficent with compounds 32-34 with a longer linker length. Two consequences can be derived from our study: (a) the distamycin moiety directs binding to the minor groove of A/T rich DNA sequences and, consequently, is responsible for the alkylation regioselectivity found in footprinting studies; (b) the higher flexibility due to a longer linker between the distamycin and uracil moieties allows the formation of complexes with the mustard moiety situated more deeply in the minor groove and, hence, with better alkylating properties.
