Effects of photochemically activated alkylating agents of the FR900482 family on chromatin.

Effects of photochemically activated alkylating agents of the FR900482 family on chromatin.
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FR900482 家族光化学活化烷化剂对染色质的影响。

DOI:
10.1016/j.chembiol.2007.04.004
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发表时间:
2007
影响因子:
--
通讯作者:
Luger,Karolin
Luger,Karolin
中科院分区:
生物1区
文献类型:
--
作者:
Subramanian,Vidya;Ducept,Pascal;Williams,RobertM;Luger,Karolin

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生物还原性烷化剂是一类重要的临床抗肿瘤抗生素,其交联和单烷基化DNA。在这里,我们使用一种合成的,光化学活化的衍生物FR400482在生物学相关的背景下研究这类药物的分子机制。我们发现,DNA组织成核小体有效地保护它免受药物介导的交联,同时允许单烷基化。这种修饰有可能导致染色质和核蛋白之间形成共价交联。使用体外方法,我们发现游离DNA的链间交联导致基础和活化转录的显著降低。最后,交联的质粒DNA被低效地组装成染色质。我们的研究为这类试剂的临床有效性提供了途径。
Bioreductive alkylating agents are an important class of clinical antitumor antibiotics that crosslink and monoalkylate DNA. Here, we use a synthetic, photochemically activated derivative of FR400482 to investigate the molecular mechanism of this class of drugs in a biologically relevant context. We find that the organization of DNA into nucleosomes effectively protects it against drug-mediated crosslinking, while permitting monoalkylation. This modification has the potential to lead to the formation of covalent crosslinks between chromatin and nuclear proteins. Using in vitro approaches, we found that interstrand crosslinking of free DNA results in a significant decrease in basal and activated transcription. Finally, crosslinked plasmid DNA is inefficiently assembled into chromatin. Our studies suggest pathways for the clinical effectiveness of this class of reagents.
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影响因子: --
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