title: Identification of a Ferric uptake regulator from Microcystis aeruginosa PCC7806.
abstract: Ferric uptake regulator (Fur) proteins are widely recognized as repressors that in many prokaryotes regulate a large number of genes involved in iron homeostasis and oxidative stress response. In our study, we were able to identify the complete sequence of the fur gene from Microcystis aeruginosa using inverse-polymerase chain reaction. DNA sequence analysis confirmed the presence of a 183 amino-acid open reading frame that showed high identity with Fur proteins reported for cyanobacteria. The recombinant Fur protein has been purified and electrophoretical mobility shift assays shown to be active. Mn2+ and dithiothreitol enable Fur to bind to its promoter, with dithiothreitol being more potent. The expression of Fur in Microcystis was induced about twofold in iron-deficient conditions.
authors.affiliation: Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, and Biocomputation and Complex Systems Physics Institute, Universidad de Zaragoza, Zaragoza, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Martin-Luna
authors.forename: Jose A
authors.initials: JA
authors.lastname: Hernandez
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Bes
authors.forename: Maria F
authors.initials: MF
authors.lastname: Fillat
authors.forename: M Luisa
authors.initials: ML
authors.lastname: Peleato
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001483:Base Sequence; D003001:Cloning, Molecular; D005290:Ferric Compounds / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D007501:Iron / Q000378:metabolism*; D046931:Microcystis / Q000378:metabolism; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D001426:Bacterial Proteins; D005290:Ferric Compounds; D011994:Recombinant Proteins; D012097:Repressor Proteins; C068477:ferric uptake regulating proteins, bacterial; D007501:Iron