The atomic structure of adeno-associated virus (AAV-2), a vector for human gene therapy

Qing Xie, Weishu Bu, Smita Bhatia, Joan Hare, Thayumanasamy Somasundaram, Arezki Azzi, Michael S. Chapman

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Abstract

The structure of the adeno-associated virus (AAV-2) has been determined to 3-Å resolution by x-ray crystallography. AAV is being developed as a vector for gene therapy to treat diseases including hemophilia, cancer, and cystic fibrosis. As in the distantly related autonomous parvoviruses, the capsid protein has a β-barrel fold, but long loops between the β-strands share little structural homology with other parvoviruses, leading to unique surface features. Most prominent are groups of threefold-related peaks, each an intimate association of loops from two neighboring subunits. Mutations affecting cell entry and receptor binding are clustered near the positively charged side of each peak, implicating the region in attachment to the cellular receptor, heparan sulfate proteoglycan. Amino acids involved in antibody binding are in the same general vicinity. The structure will guide rational engineering of vector capsids to tailor cellular targeting and to avoid immediate neutralization by an immune system sensitized by prior exposure to AAV.

Original languageEnglish (US)
Pages (from-to)10405-10410
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume99
Issue number16
DOIs
StatePublished - Aug 1 2002

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