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Proc Natl Acad Sci U S A
1992 Nov 15;8922:10822-6.
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Definition of the binding sites of individual zinc fingers in the transcription factor IIIA-5S RNA gene complex.
Clemens KR
,
Liao X
,
Wolf V
,
Wright PE
,
Gottesfeld JM
.
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A series of polypeptides containing increasing numbers of zinc fingers of Xenopus transcription factor IIIA has been generated and binding to the 5S RNA gene internal control region has been studied in order to elucidate the mode of interaction of the individual fingers with DNA. By using a combination of DNase I footprinting, methylation interference, and differential binding to mixtures of DNA fragments differing in length by single base pairs, the binding sites for individual fingers have been defined. These results have led to a model for the interaction of transcription factor IIIA with the internal control region in which fingers 1-3 bind in the major groove of the promoter C block, fingers 7-9 bind in the major groove of the A block, and finger 5 binds in the major groove of the intermediate element. Fingers 4 and 6 each bind across the minor groove, spanning these promoter elements.
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