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摘要哺乳动物NF-κBp52：p52同型二聚体及其辅因子Bcl3激活了具有中央G/c碱基对（BP）的κB位点的转录，而其对κB位点不活跃，具有中央A/T BP。To understand the molecular basis for this unique property of p52, we have deter- mined the crystal structures of recombinant human p52 protein in complex with a P-selectin(PSel)- κ B DNA (5 ′ -GGGGTGACCCC-3 ′ ) (central bp is underlined) and variants changing the central bp to A/T or swapping the flanking bp.与当前所有具有中央A/T BP的NF-κB-DNA复合物结构相比，DNA中央区域的结构显示了将近两倍的小凹槽。Microsecond molecular dynamics (MD) simulations of free DNAs and p52 bound complexes reveal that free DNAs exhibit distinct preferred conformations, and p52:p52 homodimer induces the least amount of DNA conformational changes when bound to the more transcriptionally active natural G/C-centric PSel- κ B, but adopts closed conformation when bound to the mutant A/T and swap DNAs due to their狭窄的小凹槽。我们的结合测定进一步表明，熵偏爱的快速动力学与较高的转录活性相关。总体而言，我们的研究揭示了与NF-κB复合物中κBDNA的新颖构象，并指出了由DNA构象和动态状态决定的结合动力学的重要性，在控制NF-κB的转录激活中。
NF-κBp52同二聚体-DNA复合物的结构...
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