title: DNA-binding specificity and dimerization of the DNA-binding domain of the PEND protein in the chloroplast envelope membrane.
abstract: The PEND protein is a DNA-binding protein in the inner envelope membrane of a developing chloroplast, which may anchor chloroplast nucleoids. Here we report the DNA-binding characteristics of the N-terminal basic region plus leucine zipper (bZIP)-like domain of the PEND protein that we call cbZIP domain. The basic region of the cbZIP domain diverges significantly from the basic region of known bZIP proteins that contain a bipartite nuclear localization signal. However, the cbZIP domain has the ability to dimerize in vitro. Selection of binding sites from a random sequence pool indicated that the cbZIP domain preferentially binds to a canonical sequence, TAAGAAGT. The binding site was also confirmed by gel mobility shift analysis using a representative binding site within the chloroplast DNA. These results suggest that the cbZIP domain is a unique DNA-binding domain of the chloroplast protein.
authors.affiliation: Department of Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-Ohkubo, Saitama, Saitama Prefecture 338-8570, Japan. naokisat@molbiol.saitama-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Sato
authors.forename: N
authors.initials: N
authors.lastname: Ohta
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D050976:Basic-Leucine Zipper Transcription Factors; D001665:Binding Sites / Q000235:genetics; D001667:Binding, Competitive; D002736:Chloroplasts / Q000378:metabolism*; D004247:DNA / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D019281:Dimerization; D051790:G-Box Binding Factors; D005982:Glutathione Transferase / Q000235:genetics / Q000378:metabolism; D007425:Intracellular Membranes / Q000378:metabolism; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D008969:Molecular Sequence Data; D009841:Oligonucleotides / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins; D011485:Protein Binding; D017434:Protein Structure, Tertiary / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000737:chemistry / Q000378:metabolism
chemical_list: D050976:Basic-Leucine Zipper Transcription Factors; D004268:DNA-Binding Proteins; D051790:G-Box Binding Factors; D008565:Membrane Proteins; D009841:Oligonucleotides; C112640:PEND protein, plant; D010940:Plant Proteins; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D004247:DNA; D005982:Glutathione Transferase