Nucleic Acids Research, Vol 27, Issue 2 470-478, Copyright © 1999 by Oxford University Press
Y Kagaya, K Ohmiya and T Hattori
We have cloned and characterized two novel DNA binding proteins designated
RAV1 and RAV2 from Arabidopsis thaliana. RAV1 and RAV2 contain two distinct
amino acid sequence domains found only in higher plant species. The
N-terminal regions of RAV1 and RAV2 are homologous to the AP2 DNA-binding
domain present in a family of transcription factors represented by the
Arabidopsis APETALA2 and tobacco EREBP proteins, while the C-terminal
region exhibits homology to the highly conserved C-terminal domain,
designated B3, of VP1/ABI3 transcription factors. Binding site selection
assays using a recombinant glutathione S-transferase fusion protein have
revealed that RAV1 binds specifically to bipartite recognition sequences
composed of two unrelated motifs, 5'- CAACA-3' and 5'-CACCTG-3', separated
by various spacings in two different relative orientations. Analyses using
various deletion derivatives of the RAV1 fusion protein show that the AP2
and B3-like domains of RAV1 bind autonomously to the CAACA and CACCTG
motifs, respectively, and together achieve a high affinity and specificity
of binding. From these results, we suggest that the AP2 and B3-like domains
of RAV1 are connected by a highly flexible structure enabling the two
domains to bind to the CAACA and CACCTG motifs in various spacings and
orientations.
ARTICLES
RAV1, a novel DNA-binding protein, binds to bipartite recognition sequence through two distinct DNA-binding domains uniquely found in higher plants
Center for Molecular Biology and Genetics and Department of Bioresources, School of Bioresources, Mie University, 1515 Kamihama- cho, Tsu 514-8507, Japan.
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