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The double-stranded form of adeno-associated virus (AAV) DNA has about 20 sites sensitive to endonuclease R.Hae III from Haemophilus aegypitus; the fragments produced fall into about 13 size classes, 8 of which contain single fragments. The location of the Hae III-produced AAV fragments relative to the three EcoR1 fragments was determined. Using revised figures for the molecular weights of the Hae III cleavage products of phiX174 replicative form DNA, we calculated that AAV DNA contains about 4,000 nucleotides. After Hae III digestiion of duplex DNA terminally labeled with 32P using polynucleotide kinase, the majority of fragments containing a 5' 32P label were about 40 nucleotides in length, and fragments of similar size were generated from each end, suggesting that the Hae site closest to the end is within the terminal repetition. Two more-slowly-migrating cleavage products also bore 5' 32P end label. These three terminally labeled species were also generated from single-stranded AAV DNA by digestion with Hae III, and evidence that one may have a nonlinear ("rabbit-ear") structure is presented. The predominant 5' terminal base was identified as thymine for both the plus and minus strands of AAV. Single-stranded AAV molecules could not be efficiently covalently circularized by incubation with polynucleotide ligase or ligase plus T4 DNA polymerase.

Multiple structures of adeno-associated virus DNA: analysis of terminally labeled molecules with endonuclease R-Hae III