title: Binding of yeast TFIIIC to tRNA gene bipartite internal promoters: analysis of physical effects on the intervening DNA.
abstract: Complexes between transcription factor TFIIIC and eukaryotic tRNA gene internal promoter A and B boxes are unusual in that the binding to the two distinct sites tolerates considerable variation in both distance and helical orientation between the sites. Electrophoretic mobility of Saccharomyces cerevisiae TFIIIC complexes with circularly permuted tRNA gene fragments and sensitivity of the complexes to a single stranded-specific reagent, potassium permanganate, indicated that no significant bend or distortion was introduced into the DNA by simultaneous binding to both internal promoters. These data support a model in which variability in the relative positions of the two binding sites is compensated by flexibility in the structure of TFIIIC.
authors.affiliation: Department of Biological Chemistry, University of Michigan, Ann Arbor 48109-0606.
authors.forename: C F
authors.initials: CF
authors.lastname: Evans
authors.forename: D R
authors.initials: DR
authors.lastname: Engelke
mesh_terms: D004247:DNA / Q000378:metabolism; D003850:Deoxyribonuclease I; D011401:Promoter Regions, Genetic; D012343:RNA, Transfer / Q000378:metabolism*; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000032:analysis; D012680:Sensitivity and Specificity; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D019474:Transcription Factors, TFIII; D000098832:Transcription Factor TFIIIC
chemical_list: D014157:Transcription Factors; D019474:Transcription Factors, TFIII; D000098832:Transcription Factor TFIIIC; D004247:DNA; D012343:RNA, Transfer; D003850:Deoxyribonuclease I