title: CPP1, a DNA-binding protein involved in the expression of a soybean leghemoglobin c3 gene.
abstract: Nodulin genes are specifically expressed in the nitrogen-fixing root nodules. We have identified a novel type of DNA-binding protein (CPP1) interacting with the promoter of the soybean leghemoglobin gene Gmlbc3. The DNA-binding domain of CPP1 contains two similar Cys-rich domains with 9 and 10 Cys, respectively. Genes encoding similar domains have been identified in Arabidopsis thaliana, Caenorhabditis elegans, the mouse, and human. The domains also have some homology to a Cys-rich region present in some polycomb proteins. The cpp1 gene is induced late in nodule development and the expression is confined to the distal part of the central infected tissue of the nodule. A constitutively expressed cpp1 gene reduces the expression of a Gmlbc3 promoter-gusA reporter construct in Vicia hirsuta roots. These data therefore suggest that CPP1 might be involved in the regulation of the leghemoglobin genes in the symbiotic root nodule.
authors.affiliation: Laboratory of Gene Expression, Department of Molecular and Structural Biology, University of Aarhus, Gustav Wieds Vej 10, DK-8000 Aarhus C., Denmark.
authors.forename: C
authors.initials: C
authors.lastname: Cvitanich
authors.forename: N
authors.initials: N
authors.lastname: Pallisgaard
authors.forename: K A
authors.initials: KA
authors.lastname: Nielsen
authors.forename: A C
authors.initials: AC
authors.lastname: Hansen
authors.forename: K
authors.initials: K
authors.lastname: Larsen
authors.forename: K
authors.initials: K
authors.lastname: Pihakaski-Maunsbach
authors.forename: K A
authors.initials: KA
authors.lastname: Marcker
authors.forename: E O
authors.initials: EO
authors.lastname: Jensen
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D002451:Cell Compartmentation; D002467:Cell Nucleus / Q000737:chemistry; D003545:Cysteine; D004268:DNA-Binding Proteins / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D007874:Leghemoglobin / Q000096:biosynthesis / Q000235:genetics*; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics; D018517:Plant Roots / Q000382:microbiology*; D011485:Protein Binding; D020449:Repetitive Sequences, Amino Acid; D012230:Rhizobiaceae; D017386:Sequence Homology, Amino Acid; D013025:Glycine max / Q000235:genetics*; D013559:Symbiosis; D014018:Tissue Distribution; D030262:Soybean Proteins
chemical_list: D003545:Cysteine; D004268:DNA-Binding Proteins; D007874:Leghemoglobin; D010940:Plant Proteins; C411672:Cpp1 protein, soybean; D030262:Soybean Proteins