THE PLANT CELL, Vol 3, Issue 11 1239-1250, Copyright © 1991 by American Society of Plant Biologists
A Scaffold-Associated DNA Region Is Located Downstream of the Pea Plastocyanin Gene
R. E. Slatter, P. Dupree and J. C. Gray
Botany School, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom
Chromosomal scaffold-associated DNA has been isolated from pea leaf nuclei
treated with lithium diiodosalicylate to remove histones and then digested
with restriction enzymes to remove the DNA in chromosomal loops. A
scaffold-associated region (SAR) of DNA has been identified 8 to 9 kb
downstream of the single-copy pea plastocyanin gene in proximity to a
repetitive sequence present in 300 copies in the pea haploid genome.
Isolated restriction fragments from within the SAR can bind to scaffold
preparations in a binding assay in vitro. The nucleotide sequence of the
SAR indicates a 540-bp 77% A+T-rich region containing many sequence
elements in common with SARs from other organisms. Sequences with homology
to topoisomerase II binding sites, A-box and T-box sequences, and
replication origins are present within this AT-rich region.