The bacteriophage phi 29 head-tail connector shows 13-fold symmetry in both hexagonally packed arrays and as single particles.

The bacteriophage phi 29 head-tail connector shows 13-fold symmetry in both hexagonally packed arrays and as single particles.
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噬菌体 phi 29 头尾连接器在六边形堆积阵列和单个颗粒中均显示出 13 重对称性。

DOI:
10.1016/s0006-3495(94)81009-4
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发表时间:
1994
影响因子:
3.4
通讯作者:
Egelman,EH
Egelman,EH
中科院分区:
生物学3区
文献类型:
--
作者:
Tsuprun,V;Anderson,D;Egelman,EH

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phi 29首尾连接器的对称性是有争议的:一些对连接器的二维阵列的研究发现了12重对称性,而最近对孤立粒子的研究发现了13重对称性。为了研究结构的多态性是否可以解释这些不同的结果,电子显微镜和图像分析被用来研究孤立的连接器和颗粒在六角形包装阵列。六方堆积的阵列具有P1对称性,并且连接器在阵列中和作为孤立的单个颗粒显示13个亚基。虽然我们没有观察到二维阵列中的连接器之间的多态性,并作为孤立的颗粒,数据显示,连接器可以存在12或13个亚基。我们的13倍连接器的三维重建生成的平均侧视图投影与已知的对称性相结合。还检查了在phi 29前头RNA(pRNA)存在下形成的连接体的骨架结构。这些连接器包含围绕中心的单个连接器排列的五个连接器,并且这种排列可能反映了pRNA在介导12或13倍对称连接器与连接器适合的假定的五倍对称前头部门户顶点之间的对称性失配中的重要作用。
The symmetry of the phi 29 head-tail connector is controversial: several studies of two-dimensional arrays of the connector have found a 12-fold symmetry, while a recent study of isolated particles has found a 13-fold symmetry. To investigate whether a polymorphism of the structure might explain these different results, electron microscopy and image analysis were used to study both isolated connectors and particles in hexagonally packed arrays. The hexagonally packed arrays have a P1 symmetry, and the connectors displayed 13 subunits both in the arrays and as isolated single particles. While we do not observe a polymorphism between connectors in two-dimensional arrays and as isolated particles, data show that the connectors can exist with either 12 or 13 subunits. A three-dimensional reconstruction of our 13-fold connector was generated by combining an averaged side-view projection with the known symmetry. The structure of rosettes of the connectors formed in the presence of phi 29 prohead RNA (pRNA) was also examined. These rosettes contain five connectors arranged about a single connector in the center, and this arrangement may reflect an essential role of the pRNA in mediating a symmetry mismatch between either a 12- or 13-fold symmetric connector and a putative fivefold symmetric prohead portal vertex into which the connector fits.
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