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Mol Cell Biol, March 1998, p. 1156-1162, Vol. 18, No. 3
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Nucleosome Translational Position, Not Histone
Acetylation, Determines TFIIIA Binding to Nucleosomal Xenopus
laevis 5S rRNA Genes
LeAnn
Howe and
Juan
Ausió*
Department of Biochemistry and Microbiology,
University of Victoria, Victoria, British Columbia V8W 3P6, Canada
Received 21 October 1997/Returned for modification 5 December
1997/Accepted 9 December 1997
We sought to study the binding constraints placed on the
nine-zinc-finger protein transcription factor IIIA (TFIIIA) by a histone octamer. To this end, five overlapping fragments of the Xenopus laevis oocyte and somatic 5S rRNA genes were
reconstituted into nucleosomes, and it was subsequently shown that
nucleosome translational positioning is a major determinant of the
binding of TFIIIA to the 5S rRNA genes. Furthermore, it was found that histone acetylation cannot override the TFIIIA binding constraints imposed by unfavorable translational positions.
*
Corresponding author. Mailing address: Department of
Biochemistry and Microbiology, University of Victoria, P.O. Box 3055, Victoria, British Columbia V8W 3P6, Canada. Phone: (250) 721-8863. Fax:
(250) 721-8855. E-mail: jausio{at}uvic.ca.
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