title: Three different DnaK proteins are functionally expressed in the cyanobacterium Synechocystis sp. PCC 6803.
abstract: Multiple dnaK genes appear to be common in cyanobacteria; the function of the encoded proteins is, however, still elusive. To characterize the dnaK gene family from the cyanobacterium Synechocystis sp. PCC 6803 in detail, genetic analyses were combined with analyses of the expression and localization patterns of the three encoded proteins. While significant expression of all three genes was found, the results obtained clearly indicate physiological differences of the three proteins in vivo, and DnaK2 seems to have a key function in Synechocystis. Expression of DnaK3 appears also to be as essential as expression of DnaK2, whereas the dnaK1 gene was deleted without resulting in any distorted phenotype. In line with a suggested privileged function, expression of DnaK2 altered most significantly after heat shock.
authors.affiliation: Fakultät für Biologie, Albert-Ludwigs-Universität, 79104 Freiburg, Germany.|Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany.
authors.forename: Eva
authors.initials: E
authors.lastname: Rupprecht
authors.affiliation: Fakultät für Biologie, Albert-Ludwigs-Universität, 79104 Freiburg, Germany.|Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Gathmann
authors.affiliation: Fakultät für Biologie, Albert-Ludwigs-Universität, 79104 Freiburg, Germany.|Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany.
authors.forename: Eva
authors.initials: E
authors.lastname: Fuhrmann
authors.affiliation: Institut für Biochemie und Molekularbiologie, Zentrum für Biochemie und Molekulare Zellforschung, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 19, 79104 Freiburg, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Schneider
mesh_terms: D000595:Amino Acid Sequence; D019677:Artificial Gene Fusion; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics*; D015153:Blotting, Western; D002458:Cell Fractionation; D002462:Cell Membrane / Q000737:chemistry; D003600:Cytosol / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D017353:Gene Deletion; D015870:Gene Expression; D005798:Genes, Bacterial; D020043:Genes, Essential; D017930:Genes, Reporter; D018840:HSP70 Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D006360:Heat-Shock Proteins / Q000096:biosynthesis / Q000235:genetics*; D008156:Luciferases / Q000032:analysis / Q000235:genetics; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D010802:Phylogeny; D016415:Sequence Alignment; D046939:Synechocystis / Q000235:genetics / Q000502:physiology*
chemical_list: D001426:Bacterial Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D008156:Luciferases