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Related Experiment Video

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Utilizing the Antigen Capsid-Incorporation Strategy for the Development of Adenovirus Serotype 5-Vectored Vaccine Approaches
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Published on: May 6, 2015

Structural insights into adeno-associated virus serotype 5.

Lakshmanan Govindasamy1, Michael A DiMattia, Brittney L Gurda

  • 1Department of Biochemistry and Molecular Biology, Center for Structural Biology, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, Florida, USA.

Journal of Virology
|August 9, 2013
PubMed
Summary

The crystal structure of adeno-associated virus 5 (AAV5) reveals unique capsid features, including differences in the HI loop and variable regions IV and VII. These structural variations in AAV5 capsids influence viral assembly, transduction, and antigenicity.

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Area of Science:

  • Structural Biology
  • Virology
  • Biochemistry

Background:

  • Adeno-associated viruses (AAVs) exhibit diverse cell binding and transduction properties.
  • These characteristics are determined by the viral protein (VP) composition of the AAV capsid.
  • Understanding AAV structure-function relationships is crucial for gene therapy applications.

Purpose of the Study:

  • To determine the high-resolution crystal structure of adeno-associated virus 5 (AAV5).
  • To annotate the AAV5 capsid structure for function, focusing on regions influencing assembly, transduction, and antigenicity.
  • To compare AAV5 structural features with other AAV serotypes.

Main Methods:

  • X-ray crystallography was used to determine the AAV5 capsid structure to 3.45-Å resolution.
  • Comparative analysis of AAV5 capsid structure with AAV2 and AAV4 was performed.
  • Surface-exposed loops and variable regions were analyzed for conformational differences.

Main Results:

  • The AAV5 capsid shares conserved topological features with other AAVs but has unique differences in the HI loop and variable regions IV (VR-IV) and VII (VR-VII).
  • A deletion in AAV5 results in a smaller HI loop compared to other AAVs.
  • VR-IV is shorter in AAV5, leading to a smoother capsid surface, while VR-VII is enlarged.
  • AAV5 exhibits a higher propensity of acidic residues on its interior capsid surface compared to AAV2 and AAV4, with similar volumes.

Conclusions:

  • The determined 3D structure of AAV5 provides a template for understanding its unique functional properties.
  • Specific regions, including the HI loop, VR-IV, and VR-VII, are implicated in AAV5 assembly efficiency, cellular transduction, and antigenicity.
  • Structural insights into AAV5 can guide the development of AAV-based gene therapies with improved characteristics.