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- Document 0403
- DOCN M9620403
- TI Negative regulation of the adeno-associated virus (AAV) P5 promoter
- involves both the P5 rep binding site and the consensus ATP-binding
- motif of the AAV Rep68 protein.
- DT 9602
- AU Kyostio SR; Wonderling RS; Owens RA; Laboratory of Molecular and
- Cellular Biology, National Institute; of Diabetes and Digestive and
- Kidney Diseases, National; Institutes of Health, Bethesda, MD
- 20892-0840, USA.
- SO J Virol. 1995 Nov;69(11):6787-96. Unique Identifier : AIDSLINE
- MED/96013773
- AB Transcript levels from the P5 promoter of adeno-associated virus type 2
- (AAV) are negatively regulated by the AAV Rep78 and Rep68 proteins in
- the absence of helper virus. We have identified a Rep-responsive
- negative cis element of the P5 promoter between the P5 TATA box and
- transcription start site by using 5' and 3' deletions of the P5 promoter
- fused to the chloramphenicol acetyltransferase gene. This element
- contains four imperfect GAGC repeats similar to the Rep recognition
- sequences (RRSs) in the AAV inverted terminal repeats and in the AAV
- preferred integration locus in chromosome 19. Band shift analyses showed
- that human 293 cell nuclear extracts containing Rep68 or Rep68/K340H, a
- putative nucleoside triphosphate (NTP)-binding-site mutant of Rep68,
- formed Rep-specific complexes with this P5 RRS DNA. Within the P5 RRS,
- mutation of a cytosine at position 273 in the AAV sequence to guanine
- abolished Rep68 binding to the DNA. A mutation in the P5 RRS within a
- full-length AAV genome, which abolished Rep binding, resulted in a 40 to
- 50% reduction in the ability of wild-type Rep68 to inhibit the
- accumulation of P5 transcripts in vivo. In contrast, the Rep68/K340H
- mutant was unable to down-regulate this mutated promoter. These results
- indicate that there are at least two mechanisms involved in the negative
- regulation of P5 transcript levels by Rep68; one involves Rep68 binding
- to the P5 RRS, and another requires the region of Rep68 containing the
- consensus NTP-binding motif. Furthermore, our studies of AAV genomes
- containing mutated RRS- and/or YY1-binding elements suggest that
- transcription factor YY1 binding to the transcription start site of P5
- interferes with Rep68 repression of the P5 promoter.
- DE Adenosine Triphosphate/*METABOLISM Base Sequence Binding Sites Cell
- Line Chloramphenicol Acetyltransferase Chromosome Mapping
- *Chromosomes, Human, Pair 19 Consensus Sequence Dependovirus/*GENETICS
- DNA Mutational Analysis DNA-Binding Proteins/*METABOLISM *Gene
- Expression Regulation, Viral Human HIV Long Terminal Repeat Kidney
- Molecular Sequence Data Plasmids *Promoter Regions (Genetics) RNA,
- Messenger/BIOSYNTHESIS Sequence Deletion Transcription, Genetic
- Transfection TATA Box Viral Proteins/*METABOLISM *Virus Integration
- JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
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-