ISOLATION OF 2 SOYBEAN G-BOX BINDING-FACTORS WHICH INTERACT WITH A G-BOX SEQUENCE OF AN AUXIN-RESPONSIVE GENE
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- ISOLATION OF 2 SOYBEAN G-BOX BINDING-FACTORS WHICH INTERACT WITH A G-BOX SEQUENCE OF AN AUXIN-RESPONSIVE GENE
- HONG, JC; CHEONG, YH; NAGAO, RT; BAHK, JD; KEY, JL; Cho, Moo Je
- CHALCONE SYNTHASE PROMOTER; LEUCINE ZIPPER PROTEINS; DNA-BINDING; REGULATED GENE; COILED COIL; EXPRESSION; TRANSCRIPTION; SPECIFICITY; RECOGNITION; HYPOCOTYL
- Issue Date
- PLANT JOURNAL, v.8, no.2, pp.199 - 211
- G-box binding factors (GBFs) constitute a family of plant DNA-binding proteins that bind to the G-box motif, a regulatory cis element present in many plant genes with a palindromic DNA motif of CACGTG. Previously TCCACGTGTC, a G-box motif, from an auxin responsive gene GmAux28 has been identified as a sequence-specific protein-binding site. Here the isolation of two soybean cDNA clones, referred to as SGBF-1 and SGBF-2, encoding proteins which bind to the G-box motif is reported. The primary structure of SGBF-1 and SGBF-2 predicts that these proteins contain a basic leucine zipper (bZIP) DNA-binding domain and an N-terminal proline-rich domain.
A dramatic difference in the pattern of protein-DNA complex formation was observed when recombinant SGBF-1 and SGBF-2 proteins were analyzed by electrophoretic mobility shift assays (EMSAs). The SGBF-1 binding pattern obtained with the G-box probe resulted in three major retarded bands while the SGBF-2 formed a single complex. This shows that the characteristically diffuse banding pattern of plant nuclear proteins interacting with the G-box is also observed in a binding assay using only one recombinant GBF. EMSAs were performed with a few selected binding sequences to study the effect of flanking nucleotides to the hexanucleotide G-box core motif. The binding specificity of the SGBF proteins resembles that described for type A cauliflower nuclear G-box binding proteins which bind class I G-box elements [((G)/(T))((C)/(A))CACGTG((G)/(T)) ((A)/(C))]. Phylogenetic analysis of 13 GBF-like proteins from various plant species reveals that the SGBF-1 and SGBF-2 proteins belong to different lineages, suggesting that they may have distinct functions in activating transcription.
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