title: DNA binding factor GT-2 from Arabidopsis.
abstract: Complementary DNA clones encoding a DNA-binding factor have been obtained from Arabidopsis by DNA hybridization with a GT-2 factor cDNA clone from rice. The GT-2 gene appears to be present as a single copy in the Arabidopsis genome and is transcribed as a 2.1 kb mRNA which is not light-regulated. The longest open reading frame in the sequenced clones predicts a protein of 65 kDa, beginning with the first in-frame methionine. The protein contains basic, acidic, and proline/glutamine-rich motifs and has significant amino acid sequence homology to the rice GT-2 factor, including three regions of 50-75 amino acids each of greater than 60% identity. Two of these regions are predicted to form similar trihelix structures postulated to be involved in selective binding to specific variations of a GT-box motif DNA sequence found in the promoter regions of several plant genes. Except for weak similarity to a tobacco GT-box binding factor, GT-1a/B2F, Arabidopsis GT-2 has no similarity to other sequences in the databases. DNA-binding studies show that Arabidopsis GT-2 has binding characteristics similar to those of the rice GT-2 factor, but dissimilar to those of the tobacco GT-1a/B2F factor. The data indicate that a DNA-binding factor containing domains of similar structure and target-sequence specificity has been conserved between monocots and dicots.
authors.affiliation: Department of Plant Biology, University of California-Berkeley.
authors.forename: R M
authors.initials: RM
authors.lastname: Kuhn
authors.forename: T
authors.initials: T
authors.lastname: Caspar
authors.forename: K
authors.initials: K
authors.lastname: Dehesh
authors.forename: P H
authors.initials: PH
authors.lastname: Quail
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins; D001483:Base Sequence; D018076:DNA, Complementary / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D015723:Gene Library; D017343:Genes, Plant; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction; D017433:Protein Structure, Secondary; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
chemical_list: D029681:Arabidopsis Proteins; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; C083955:GT2 protein, Arabidopsis; D010940:Plant Proteins