title: Simian virus 40 early- and late-region promoter functions are enhanced by the 72-base-pair repeat inserted at distant locations and inverted orientations.
abstract: Tandemly repeated 72-base-pair (bp) segments located between nucleotides 107 and 250 of the simian virus 40 genome are essential for early region transcription. The functional requirement for the 72-bp repeat was supplied even when that segment was translocated to several locations distant from, and in different orientation, relative to, the promoter. Regardless of the position of the 72-bp enhancer segment, transcription was initiated at the same locations as with the normal promoter. Translocation of the 72-bp repeat segment to other sites in the genome resulted in the appearance of DNase I hypersensitivity at that site in the intranuclear viral minichromosomes. One of the translocations which did not produce enhancement of early- and late-region expression also failed to create a DNase I-hypersensitive site at the translocated 72-bp segment.
mesh_terms: D001483:Base Sequence; D004279:DNA, Viral / Q000235:genetics*; D003851:Deoxyribonucleases / Q000378:metabolism; D005786:Gene Expression Regulation; D008040:Genetic Linkage; D009154:Mutation; D009876:Operon; D012091:Repetitive Sequences, Nucleic Acid; D013539:Simian virus 40 / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D004279:DNA, Viral; D003851:Deoxyribonucleases