Nucleic Acids Research, Vol 24, Issue 12 2204-2211, Copyright © 1996 by Oxford University Press
M Marilley and P Pasero
Nucleotide sequences of DNA regions containing eukaryotic ribosomal
promoters were analysed using strategies designed to reveal sequence-
directed structural features. DNA curvature, duplex stability and pattern
of twist angle variation were studied by computer modelling. Although
ribosomal promoters are known to lack sequence homology (unless very
closely related species are considered), investigation of these structural
characteristics uncovered striking homologies in all the taxonomic groups
examined so far. This wide conservation of DNA structures, while DNA
sequence is not conserved, suggests that the determined structures are
fundamental for ribosomal promoter function. Moreover, this result agrees
well with the recent observations showing that RNA polymerase I
transcription factors have not evolved as intensively as previously
suspected.
ARTICLES
Common DNA structural features exhibited by eukaryotic ribosomal gene promoters
Laboratoire de Genetique GDR CNRS 976, Faculte de Medicine, Marseille, France.
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