Visualization by atomic force microscopy of tobacco mosaic virus movement protein-RNA complexes formed in vitro.

Visualization by atomic force microscopy of tobacco mosaic virus movement protein-RNA complexes formed in vitro.
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通过原子力显微镜观察体外形成的烟草花叶病毒运动蛋白-RNA 复合物。

DOI:
10.1099/0022-1317-82-6-1503
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发表时间:
2001
期刊:
The Journal of general virology
影响因子:
--
通讯作者:
Atabekov,JG
Atabekov,JG
中科院分区:
--
文献类型:
--
作者:
Kiselyova,OI;Yaminsky,IV;Karger,EM;Frolova,OYu;Dorokhov,YL;Atabekov,JG

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利用原子力显微镜在云母表面观察了烟草花叶病毒(TMV)编码运动蛋白(MP)与TMV RNA和短(890 nt)合成RNA转录物形成复合物的结构。发现MP分子沿RNA链分布,MP - RNA复合物的结构取决于形成复合物的摩尔MP:RNA比。MP:TMV RNA的摩尔比从20:1增加到60-100:1,导致TMV RNA上MP包装的密度增加,复合物的结构从RNA敏感的“串珠”转变为“粗串”形式,部分抵抗RNA酶。在不同的MP:RNA比例下,短合成RNA转录物也产生了“粗串”型RNA抗性复合物。“粗串”复合物被认为代表MP分子簇与TMV RNA的离散区域协同结合,并被无蛋白RNA片段分开。
The structure of complexes formedin vitroby tobacco mosaic virus (TMV)-coded movement protein (MP) with TMV RNA and short (890 nt) synthetic RNA transcripts was visualized by atomic force microscopy on a mica surface. MP molecules were found to be distributed along the chain of RNA and the structure of MP–RNA complexes depended on the molar MP:RNA ratios at which the complexes were formed. A rise in the molar MP:TMV RNA ratio from 20:1 to 60–100:1 resulted in an increase in the density of the MP packaging on TMV RNA and structural conversion of complexes from RNase-sensitive ‘beads-on-a-string’ into a ‘thick string’ form that was partly resistant to RNase. The ‘thick string’-type RNase-resistant complexes were also produced by short synthetic RNA transcripts at different MP:RNA ratios. The ‘thick string’ complexes are suggested to represent clusters of MP molecules cooperatively bound to discrete regions of TMV RNA and separated by protein-free RNA segments.
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