ジャーナル: Elife / 年: 2013 タイトル: A new topology of the HK97-like fold revealed in Bordetella bacteriophage by cryoEM at 3.5 A resolution. 著者: Xing Zhang / Huatao Guo / Lei Jin / Elizabeth Czornyj / Asher Hodes / Wong H Hui / Angela W Nieh / Jeff F Miller / Z Hong Zhou / 要旨: Bacteriophage BPP-1 infects and kills Bordetella species that cause whooping cough. Its diversity-generating retroelement (DGR) provides a naturally occurring phage-display system, but engineering ...Bacteriophage BPP-1 infects and kills Bordetella species that cause whooping cough. Its diversity-generating retroelement (DGR) provides a naturally occurring phage-display system, but engineering efforts are hampered without atomic structures. Here, we report a cryo electron microscopy structure of the BPP-1 head at 3.5 Å resolution. Our atomic model shows two of the three protein folds representing major viral lineages: jellyroll for its cement protein (CP) and HK97-like ('Johnson') for its major capsid protein (MCP). Strikingly, the fold topology of MCP is permuted non-circularly from the Johnson fold topology previously seen in viral and cellular proteins. We illustrate that the new topology is likely the only feasible alternative of the old topology. β-sheet augmentation and electrostatic interactions contribute to the formation of non-covalent chainmail in BPP-1, unlike covalent inter-protein linkages of the HK97 chainmail. Despite these complex interactions, the termini of both CP and MCP are ideally positioned for DGR-based phage-display engineering. DOI: http://dx.doi.org/10.7554/eLife.01299.001.
A: major capsid protein B: major capsid protein C: major capsid protein D: major capsid protein E: major capsid protein F: major capsid protein G: major capsid protein H: cementing protein I: cementing protein J: cementing protein K: cementing protein L: cementing protein M: cementing protein N: cementing protein
A: major capsid protein B: major capsid protein C: major capsid protein D: major capsid protein E: major capsid protein F: major capsid protein G: major capsid protein H: cementing protein I: cementing protein J: cementing protein K: cementing protein L: cementing protein M: cementing protein N: cementing protein
A: major capsid protein B: major capsid protein C: major capsid protein D: major capsid protein E: major capsid protein F: major capsid protein G: major capsid protein H: cementing protein I: cementing protein J: cementing protein K: cementing protein L: cementing protein M: cementing protein N: cementing protein
x 5
icosahedral pentamer
1.78 MDa, 70 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
1,782,352
70
ポリマ-
1,782,352
70
非ポリマー
0
0
水
0
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
point symmetry operation
4
4
A: major capsid protein B: major capsid protein C: major capsid protein D: major capsid protein E: major capsid protein F: major capsid protein G: major capsid protein H: cementing protein I: cementing protein J: cementing protein K: cementing protein L: cementing protein M: cementing protein N: cementing protein