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• W2037962246 abstract "A group of four interacting amino acids in adeno-associated virus type 8 (AAV8) called the pH quartet has been shown to undergo a structural change when subjected to acidic pH comparable to that seen in endosomal compartments. We examined the phenotypes of mutants with mutations in these amino acids as well as several nearby residues in the background of AAV2. We found that three of the mutations in this region (Y704A, E562A, and E564A) produce normal titers of mature capsids but are extremely defective for transduction (>10(7)-fold). The remaining mutants were also defective for transduction, but the defect in these mutants (E563A, E561A, H526A, and R389A) is not as severe (3- to 22-fold). Two other mutants (Y700A and Y730A) were found to be defective for virus assembly. One of the extremely defective mutants (Y704A) was found to enter the cell, traffic to the nucleus, and uncoat its DNA nearly as efficiently as the wild type. This suggested that some step after nuclear entry and uncoating was defective. To see if the extremely defective mutants were impaired in second-strand synthesis, the Y704A, E562A, and E564A mutants containing self-complementary DNA were compared with virus containing single-stranded genomes. Two of the mutants (Y704A and E564A) showed 1-log and 3-log improvements in infectivity, respectively, while the third mutant (E562A) showed no change. This suggested that inhibition of second-strand synthesis was responsible for some but not most of the defect in these mutants. Comparison of Y704A mRNA synthesis with that of the wild-type capsid showed that accumulation of steady-state mRNA in the Y704A mutant was reduced 450-fold, even though equal genome numbers were uncoated. Our experiments have identified a novel capsid function. They suggest that AAV capsids may play a role in the initiation of both second-strand synthesis and transcription of the input genome." @default.
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• W2037962246 date "2014-01-15" @default.
• W2037962246 modified "2023-10-18" @default.
• W2037962246 title "Adeno-Associated Virus Capsid Proteins May Play a Role in Transcription and Second-Strand Synthesis of Recombinant Genomes" @default.
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• W2037962246 doi "https://doi.org/10.1128/jvi.02093-13" @default.
• W2037962246 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3911664" @default.
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