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TitleCapsid structure of phage SPO1 reveals novel minor capsid proteins and insights into capsid stabilization.
Journal, issue, pagesStructure, Vol. 33, Issue 11, Page 1844-11855.e2, Year 2025
Publish dateNov 6, 2025
AuthorsXinyue Zhao / Aohan Wang / Yueting Wang / Yue Kang / Qianqian Shao / Lin Li / Yaqi Zheng / Hongli Hu / Xiangyun Li / Hongling Fan / Can Cai / Bing Liu / Qianglin Fang /
PubMed AbstractSPO1-related bacteriophages are promising candidates for phage therapy. We present the 3.0 Å cryo-electron microscopy (cryo-EM) structure of the SPO1 capsid with a triangulation number T = 16, ...SPO1-related bacteriophages are promising candidates for phage therapy. We present the 3.0 Å cryo-electron microscopy (cryo-EM) structure of the SPO1 capsid with a triangulation number T = 16, enabling the construction of an atomic model comprising the major capsid protein and three types of minor capsid proteins: gp29.2, gp2.7, and gp36.3. These minor capsid proteins adopt novel folds. They might stabilize the capsid and determine its curvature. Gp29.2 monomers contain a three-blade propeller fold and are located at the 3-fold and quasi-three-fold axes. Gp2.7 forms pentamers atop pentameric capsomers, while gp36.3 binds to the capsid's inner surface, forming star-shaped structures increasing connections between pentameric and hexameric capsomers. The surface exposed regions of gp29.2 and gp2.7 make SPO1 of interest as a nanocage for phage display. Our findings advance the understanding of capsid architecture, stabilization, and local curvature determination for SPO1-related bacteriophages.
External linksStructure / PubMed:40885197
MethodsEM (single particle)
Resolution3.0 - 5.5 Å
Structure data

65011

9vel

EMDB-65011, PDB-9vel:
The composite cryo-EM structure of bacteriophage SPO1 capsid
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-65012: A block of bacteriophage SPO1 capsid
Method: EM (single particle) / Resolution: 3.0 Å

EMDB-65738: The consensus cryo-EM structure of bacteriophage SPO1 capsid
Method: EM (single particle) / Resolution: 5.5 Å

Source
  • bacillus phage spo1 (virus)
KeywordsVIRUS / SPO1 / Phage / Capsid

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