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Journal of Virology, February 1999, p. 1309-1319, Vol. 73, No. 2
Molecular Hematology Branch, National Heart,
Lung and Blood Institute, Bethesda, Maryland 20892
Received 26 August 1998/Accepted 30 October 1998
Adeno-associated virus type 5 (AAV5) is distinct from other
dependovirus serotypes based on DNA hybridization and serological data.
To better understand the biology of AAV5, we have cloned and sequenced
its genome and generated recombinant AAV5 particles. The
single-stranded DNA genome is similar in length and genetic organization to that of AAV2. The rep gene of AAV5 is 67%
homologous to AAV2, with the majority of the changes occurring in the
carboxyl and amino termini. This homology is much less than that
observed with other reported AAV serotypes. The inverted terminal
repeats (ITRs) are also unique compared to those of the other AAV
serotypes. While the characteristic AAV hairpin structure and the Rep
DNA binding site are retained, the consensus terminal resolution site is absent. These differences in the Rep proteins and the ITRs result in
a lack of cross-complementation between AAV2 and AAV5 as measured by
the production of recombinant AAV particles. Alignment of the cap open
reading frame with that of the other AAV serotypes identifies both
conserved and variable regions which could affect tissue tropism and
particle stability. Comparison of transduction efficiencies in a
variety of cells lines and a lack of inhibition by soluble heparin
indicate that AAV5 may utilize a distinct mechanism of uptake compared
to AAV2.
0022-538X/99/$00.00+0
Cloning and Characterization of
Adeno-Associated Virus Type 5
*
Corresponding author. Mailing address: Molecular
Hematology Branch, NIH, NHLBI, Bldg. 10, 7D18, 10 Center Dr. MSC 1654, Bethesda, MD 20892-1654. Phone: (301) 496-1594. Fax: (301) 496-9985. E-mail: Kotinr{at}fido.nhlbi.nih.gov.
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