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TitleAviadenovirus structure: A highly thermostable capsid in the absence of stabilizing proteins.
Journal, issue, pagesPLoS Pathog, Vol. 21, Issue 10, Page e1013553, Year 2025
Publish dateOct 9, 2025
AuthorsMarta Pérez-Illana / Anna Schachner / Mercedes Hernando-Pérez / Gabriela N Condezo / Alberto Paradela / Marta Martínez / Roberto Marabini / Michael Hess / Carmen San Martín /
PubMed AbstractHigh-resolution structural studies have mainly focused on two out of the six adenovirus genera: mastadenoviruses and atadenoviruses. Here we report the high-resolution structure of an aviadenovirus, ...High-resolution structural studies have mainly focused on two out of the six adenovirus genera: mastadenoviruses and atadenoviruses. Here we report the high-resolution structure of an aviadenovirus, the poultry pathogen fowl adenovirus serotype 4 (FAdV-C4). FAdV-C4 virions are highly thermostable, despite lacking minor coat and core proteins shown to stabilize the mast- and atadenovirus particles, having no genus-specific cementing proteins, and packaging a 25% longer genome. Unique structural features of the FAdV-C4 hexon include a large insertion at the trimer equatorial region, and a long N-terminal tail. Protein IIIa conformation is closer to atadenoviruses than to mastadenoviruses, while protein VIII diverges from all previously reported structures. We interpret these differences in light of adenovirus evolution. Finally, we discuss the possible role of core composition in determining capsid stability properties. These results enlarge our view on the structural diversity of adenoviruses, and provide useful information to counteract fowl pathogens or use non-human adenoviruses as vectors.
External linksPLoS Pathog / PubMed:41066551 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 3.4 Å
Structure data

EMDB-19396: FAdV-C4 Aviadenovirus structure, strain AG234
Method: EM (single particle) / Resolution: 3.2 Å

19401

8roq

EMDB-19401, PDB-8roq:
FAdV-C4 Aviadenovirus structure, strain KR5
Method: EM (single particle) / Resolution: 3.4 Å

Source
  • fowl aviadenovirus c
KeywordsVIRUS / adenovirus / fowl / highly thermostable

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