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
中科院分区:
文献类型:
--
作者:
Tsuprun,V;Anderson,D;Egelman,EH
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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作者:
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期刊:
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