DNA bending-induced phase transition of encapsidated genome in phage λ.

DNA bending-induced phase transition of encapsidated genome in phage λ.
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DNA弯曲诱导的噬菌体基因组的相位过渡。

DOI:
10.1093/nar/gkt137
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发表时间:
2013-04
影响因子:
14.9
通讯作者:
Evilevitch A
Evilevitch A
中科院分区:
生物学2区
文献类型:
--
作者:
Lander GC;Johnson JE;Rau DC;Potter CS;Carragher B;Evilevitch A

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噬菌体衣壳中的DNA结构由DNA-DNA相互作用和弯曲能决定。排斥相互作用对DNA轴间距的影响以前进行了研究,但没有DNA弯曲对其结构的影响在病毒衣壳。通过改变包装DNA的长度,并通过添加精胺离子,我们将相互作用能从净排斥净吸引。这使我们能够分离出弯曲对所得DNA结构的影响。我们用单粒子冷冻电镜重建分析法测定了噬菌体λ衣壳中双链DNA的链间间距。这些数据表明,应力和包装缺陷,都是由于DNA弯曲的衣壳,能够诱导一个长距离的相转变,从一个六角形的包装结构的crosssidated的DNA基因组。这种结构观察表明,由于影响病毒DNA排出和包装速率的相变,基因组流动性发生了显著变化。
The DNA structure in phage capsids is determined by DNA–DNA interactions and bending energy. The effects of repulsive interactions on DNA interaxial distance were previously investigated, but not the effect of DNA bending on its structure in viral capsids. By varying packaged DNA length and through addition of spermine ions, we transform the interaction energy from net repulsive to net attractive. This allowed us to isolate the effect of bending on the resulting DNA structure. We used single particle cryo-electron microscopy reconstruction analysis to determine the interstrand spacing of double-stranded DNA encapsidated in phage λ capsids. The data reveal that stress and packing defects, both resulting from DNA bending in the capsid, are able to induce a long-range phase transition in the encapsidated DNA genome from a hexagonal to a cholesteric packing structure. This structural observation suggests significant changes in genome fluidity as a result of a phase transition affecting the rates of viral DNA ejection and packaging.
DOI: 10.1016/j.virol.2007.07.035
发表时间: 2008-02-20
期刊: VIROLOGY
影响因子: 3.7
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DOI: 10.1016/0092-8674(91)90324-r
发表时间: 1991-03-08
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