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.
S: Portal protein(gp 16) of the cyanophage P-SCSP1u T: Portal protein(gp 16) of the cyanophage P-SCSP1u U: Portal protein(gp 16) of the cyanophage P-SCSP1u V: Portal protein(gp 16) of the cyanophage P-SCSP1u W: Portal protein(gp 16) of the cyanophage P-SCSP1u X: Portal protein(gp 16) of the cyanophage P-SCSP1u Y: Portal protein(gp 16) of the cyanophage P-SCSP1u Z: Portal protein(gp 16) of the cyanophage P-SCSP1u a: Portal protein(gp 16) of the cyanophage P-SCSP1u b: Portal protein(gp 16) of the cyanophage P-SCSP1u c: Portal protein(gp 16) of the cyanophage P-SCSP1u d: Portal protein(gp 16) of the cyanophage P-SCSP1u A: Nozzle protein(gp 23) of the cyanophage P-SCSP1u B: Nozzle protein(gp 23) of the cyanophage P-SCSP1u C: Nozzle protein(gp 23) of the cyanophage P-SCSP1u D: Nozzle protein(gp 23) of the cyanophage P-SCSP1u E: Nozzle protein(gp 23) of the cyanophage P-SCSP1u F: Nozzle protein(gp 23) of the cyanophage P-SCSP1u G: Adaptor protein(gp22) of the cyanophage P-SCSP1u H: Adaptor protein(gp22) of the cyanophage P-SCSP1u I: Adaptor protein(gp22) of the cyanophage P-SCSP1u J: Adaptor protein(gp22) of the cyanophage P-SCSP1u K: Adaptor protein(gp22) of the cyanophage P-SCSP1u L: Adaptor protein(gp22) of the cyanophage P-SCSP1u q: Adaptor protein(gp22) of the cyanophage P-SCSP1u r: Adaptor protein(gp22) of the cyanophage P-SCSP1u s: Adaptor protein(gp22) of the cyanophage P-SCSP1u t: Adaptor protein(gp22) of the cyanophage P-SCSP1u u: Adaptor protein(gp22) of the cyanophage P-SCSP1u v: Adaptor protein(gp22) of the cyanophage P-SCSP1u e: Fiber protein(gp 28) of the cyanophage P-SCSP1u f: Fiber protein(gp 28) of the cyanophage P-SCSP1u g: Fiber protein(gp 28) of the cyanophage P-SCSP1u h: Fiber protein(gp 28) of the cyanophage P-SCSP1u j: Fiber protein(gp 28) of the cyanophage P-SCSP1u l: Fiber protein(gp 28) of the cyanophage P-SCSP1u i: Fiber protein(gp 28) of the cyanophage P-SCSP1u k: Fiber protein(gp 28) of the cyanophage P-SCSP1u m: Fiber protein(gp 28) of the cyanophage P-SCSP1u n: Fiber protein(gp 28) of the cyanophage P-SCSP1u o: Fiber protein(gp 28) of the cyanophage P-SCSP1u p: Fiber protein(gp 28) of the cyanophage P-SCSP1u M: Fiber protein(gp 28) of the cyanophage P-SCSP1u N: Fiber protein(gp 28) of the cyanophage P-SCSP1u O: Fiber protein(gp 28) of the cyanophage P-SCSP1u P: Fiber protein(gp 28) of the cyanophage P-SCSP1u Q: Fiber protein(gp 28) of the cyanophage P-SCSP1u R: Fiber protein(gp 28) of the cyanophage P-SCSP1u