Cooperative recognition of T:T mismatch by echinomycin causes structural distortions in DNA duplex
Cooperative recognition of T:T mismatch by echinomycin causes structural distortions in DNA duplex
复制标题
棘霉素对 T:T 错配的协同识别导致 DNA 双链体结构扭曲
作者:
Pei;Shu;Chung;Y. Kao;M. Waring;M. Hou
Abstract Small-molecule compounds that target mismatched base pairs in DNA offer a novel prospective for cancer diagnosis and therapy. The potent anticancer antibiotic echinomycin functions by intercalating into DNA at CpG sites. Surprisingly, we found that the drug strongly prefers to bind to consecutive CpG steps separated by a single T:T mismatch. The preference appears to result from enhanced cooperativity associated with the binding of the second echinomycin molecule. Crystallographic studies reveal that this preference originates from the staggered quinoxaline rings of the two neighboring antibiotic molecules that surround the T:T mismatch forming continuous stacking interactions within the duplex. These and other associated changes in DNA conformation allow the formation of a minor groove pocket for tight binding of the second echinomycin molecule. We also show that echinomycin displays enhanced cytotoxicity against mismatch repair-deficient cell lines, raising the possibility of repurposing the drug for detection and treatment of mismatch repair-deficient cancers.
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影响因子:
2.8
作者:
Boyle KM;Barton JK
通讯作者:
Barton JK
影响因子:
14.9
作者:
Gilbert,DE;Feigon,J
通讯作者:
Feigon,J
影响因子:
2.9
作者:
Ernst, Russell J.;Komor, Alexis C.;Barton, Jacqueline K.
通讯作者:
Barton, Jacqueline K.
DOI:
10.1021/jp403127a
发表时间:
2013
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
Sharma,Monika;Predeus,AlexanderV;Mukherjee,Shayantani;Feig,Michael
通讯作者:
Feig,Michael
影响因子:
15
作者:
Komor, Alexis C.;Schneider, Curtis J.;Weidmann, Alyson G.;Barton, Jacqueline K.
通讯作者:
Barton, Jacqueline K.