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• W2053273074 abstract "Adriamycin is known to specifically induce DNA interstrand cross-links at 5′-GC sequences. Because 5′-GC sequences are a predominant feature of 5′-untranslated regions (transcription factor-binding sites, promoter, and enhancer regions), it is likely that adriamycin adducts at GC sites would affect the binding of DNA-interacting proteins. Two model systems were chosen for the analysis: the octamer-binding proteins Oct-1, N-Oct-3 and N-Oct-5, which bind to ATGCAAAT and TAATGARAT recognition sites, and Escherichia coli RNA polymerase binding to the lac UV5 promoter. Electrophoretic mobility shift studies showed that adriamycin adducts at GC sites inhibited the binding of octamer proteins to their consensus motifs at drug levels as low as 1 μM, but no effect was observed with a control sequence lacking a GC site. Adriamycin adducts at GC sites also inhibited the binding of RNA polymerase to the lac UV5 promoter. Adriamycin may therefore function by down-regulating the expression of specific genes by means of inactivation of short but critical motifs containing one or more GC sites. Adriamycin is known to specifically induce DNA interstrand cross-links at 5′-GC sequences. Because 5′-GC sequences are a predominant feature of 5′-untranslated regions (transcription factor-binding sites, promoter, and enhancer regions), it is likely that adriamycin adducts at GC sites would affect the binding of DNA-interacting proteins. Two model systems were chosen for the analysis: the octamer-binding proteins Oct-1, N-Oct-3 and N-Oct-5, which bind to ATGCAAAT and TAATGARAT recognition sites, and Escherichia coli RNA polymerase binding to the lac UV5 promoter. Electrophoretic mobility shift studies showed that adriamycin adducts at GC sites inhibited the binding of octamer proteins to their consensus motifs at drug levels as low as 1 μM, but no effect was observed with a control sequence lacking a GC site. Adriamycin adducts at GC sites also inhibited the binding of RNA polymerase to the lac UV5 promoter. Adriamycin may therefore function by down-regulating the expression of specific genes by means of inactivation of short but critical motifs containing one or more GC sites." @default.
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• W2053273074 date "1996-03-01" @default.
• W2053273074 modified "2023-10-18" @default.
• W2053273074 title "Adriamycin-induced DNA Adducts Inhibit the DNA Interactions of Transcription Factors and RNA Polymerase" @default.
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• W2053273074 doi "https://doi.org/10.1074/jbc.271.10.5422" @default.
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