The University Grants Committee, Research Grants Council (RGC)
香港
引用
ジャーナル: Nat Commun / 年: 2023 タイトル: Cryo-EM structure of cyanophage P-SCSP1u offers insights into DNA gating and evolution of T7-like viruses. 著者: Lanlan Cai / Hang Liu / Wen Zhang / Shiwei Xiao / Qinglu Zeng / Shangyu Dang / 要旨: Cyanophages, together with their host cyanobacteria, play important roles in marine biogeochemical cycles and control of marine food webs. The recently identified MPP-C (Marine Picocyanobacteria ...Cyanophages, together with their host cyanobacteria, play important roles in marine biogeochemical cycles and control of marine food webs. The recently identified MPP-C (Marine Picocyanobacteria Podovirus clade C) cyanophages, belonging to the T7-like podoviruses, contain the smallest genomes among cyanopodoviruses and exhibit distinct infection kinetics. However, understanding of the MPP-C cyanophage infection process is hindered by the lack of high-resolution structural information. Here, we report the cryo-EM structure of the cyanophage P-SCSP1u, a representative member of the MPP-C phages, in its native form at near-atomic resolution, which reveals the assembly mechanism of the capsid and molecular interaction of the portal-tail complex. Structural comparison of the capsid proteins of P-SCSP1u and other podoviruses with known structures provides insights into the evolution of T7-like viruses. Furthermore, our study provides the near-atomic resolution structure of portal-tail complex for T7-like viruses. On the basis of previously reported structures of phage T7, we identify an additional valve and gate to explain the DNA gating mechanism for the T7-like viruses.
D: The capsid protein(gp 19) of P-SCSP1u A: The capsid protein(gp 19) of P-SCSP1u B: The capsid protein(gp 19) of P-SCSP1u C: The capsid protein(gp 19) of P-SCSP1u E: The capsid protein(gp 19) of P-SCSP1u F: The capsid protein(gp 19) of P-SCSP1u G: The capsid protein(gp 19) of P-SCSP1u
D: The capsid protein(gp 19) of P-SCSP1u A: The capsid protein(gp 19) of P-SCSP1u B: The capsid protein(gp 19) of P-SCSP1u C: The capsid protein(gp 19) of P-SCSP1u E: The capsid protein(gp 19) of P-SCSP1u F: The capsid protein(gp 19) of P-SCSP1u G: The capsid protein(gp 19) of P-SCSP1u
D: The capsid protein(gp 19) of P-SCSP1u A: The capsid protein(gp 19) of P-SCSP1u B: The capsid protein(gp 19) of P-SCSP1u C: The capsid protein(gp 19) of P-SCSP1u E: The capsid protein(gp 19) of P-SCSP1u F: The capsid protein(gp 19) of P-SCSP1u G: The capsid protein(gp 19) of P-SCSP1u
x 5
icosahedral pentamer
1.23 MDa, 35 ポリマー
分子量 (理論値)
分子数
合計 (水以外)
1,230,615
35
ポリマ-
1,230,615
35
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
D: The capsid protein(gp 19) of P-SCSP1u A: The capsid protein(gp 19) of P-SCSP1u B: The capsid protein(gp 19) of P-SCSP1u C: The capsid protein(gp 19) of P-SCSP1u E: The capsid protein(gp 19) of P-SCSP1u F: The capsid protein(gp 19) of P-SCSP1u G: The capsid protein(gp 19) of P-SCSP1u