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TitleHuman cell surface-AAV interactomes identify LRP6 as blood-brain barrier transcytosis receptor and immune cytokine IL3 as AAV9 binder.
Journal, issue, pagesNat Commun, Vol. 15, Issue 1, Page 7853, Year 2024
Publish dateSep 8, 2024
AuthorsTimothy F Shay / Seongmin Jang / Tyler J Brittain / Xinhong Chen / Beth Walker / Claire Tebbutt / Yujie Fan / Damien A Wolfe / Cynthia M Arokiaraj / Erin E Sullivan / Xiaozhe Ding / Ting-Yu Wang / Yaping Lei / Miguel R Chuapoco / Tsui-Fen Chou / Viviana Gradinaru /
PubMed AbstractAdeno-associated viruses (AAVs) are foundational gene delivery tools for basic science and clinical therapeutics. However, lack of mechanistic insight, especially for engineered vectors created by ...Adeno-associated viruses (AAVs) are foundational gene delivery tools for basic science and clinical therapeutics. However, lack of mechanistic insight, especially for engineered vectors created by directed evolution, can hamper their application. Here, we adapt an unbiased human cell microarray platform to determine the extracellular and cell surface interactomes of natural and engineered AAVs. We identify a naturally-evolved and serotype-specific interaction between the AAV9 capsid and human interleukin 3 (IL3), with possible roles in host immune modulation, as well as lab-evolved low-density lipoprotein receptor-related protein 6 (LRP6) interactions specific to engineered capsids with enhanced blood-brain barrier crossing in non-human primates after intravenous administration. The unbiased cell microarray screening approach also allows us to identify off-target tissue binding interactions of engineered brain-enriched AAV capsids that may inform vectors' peripheral organ tropism and side effects. Our cryo-electron tomography and AlphaFold modeling of capsid-interactor complexes reveal LRP6 and IL3 binding sites. These results allow confident application of engineered AAVs in diverse organisms and unlock future target-informed engineering of improved viral and non-viral vectors for non-invasive therapeutic delivery to the brain.
External linksNat Commun / PubMed:39245720 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution11.0 - 20.0 Å
Structure data

EMDB-41918: 3-fold symmetry face of adeno-associated virus-9 and human Interleukin 3 complex
Method: EM (subtomogram averaging) / Resolution: 20.0 Å

EMDB-42063: I1 symmetry applied adeno-associated virus-9 with human Interleukin 3
Method: EM (subtomogram averaging) / Resolution: 11.0 Å

Source
  • Adeno-associated virus 9
  • Homo sapiens (human)

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