title: An evolutionarily conserved protein binding sequence upstream of a plant light-regulated gene.
abstract: A protein factor, identified in nuclear extracts obtained from tomato (Lycopersicon esculentum, Solanaceae) and Arabidopsis thaliana (Brassicaceae) seedlings, specifically binds upstream sequences from the plant light-regulated gene family encoding the small subunit of ribulose 1,5-bisphosphate carboxylase/oxygenase (RBCS). RBCS upstream sequences from tomato, pea (Pisum sativum, Leguminosae), and Arabidopsis are recognized by the factor. The factor recognition occurs via a short conserved sequence (G box) whose consensus sequence is 5'-TCTTACACGTGGCAYY-3' (where Y is pyrimidine). This sequence is distinct from the GT motif described previously in RBCS promoters. Two other conserved sequences, showing a lesser degree of evolutionary conservation, are found upstream of the G box but do not bind to the G box binding factor (GBF). Twelve nucleotides within the G box are sufficient for the formation of a stable DNA-GBF complex. GBF is found in both light-grown and dark-adapted tomato leaf extracts, but it is present in greatly reduced amounts in root extracts.
mesh_terms: D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D005801:Genes, Homeobox; D008969:Molecular Sequence Data; D010944:Plants / Q000235:genetics*; D011485:Protein Binding; D012273:Ribulose-Bisphosphate Carboxylase / Q000235:genetics; D014675:Vegetables
chemical_list: D004268:DNA-Binding Proteins; D012273:Ribulose-Bisphosphate Carboxylase