title: Insights into the Structure of Sulfolobus Nucleoid Using Engineered Sac7d Dimers with a Defined Orientation.
abstract: The structure of Archaeal chromatin or nucleoid is believed to have characteristics similar to that found in both eukaryotes and bacteria. Recent comparative studies have suggested that DNA compaction in Archaea requires a bridging protein (e.g., Alba) along with either a wrapping protein (e.g., a histone) or a bending protein such as Sac7d. While X-ray crystal structures demonstrate that Sac7d binds as a monomer to create a significant kink in duplex DNA, the structure of a multiprotein-DNA complex has not been established. Using cross-linked dimers of Sac7d with a defined orientation, we present evidence that indicates that Sac7d is able to largely coat duplex DNA in vivo by binding in alternating head-to-head and tail-to-tail orientations. Although each Sac7d monomer promotes a significant kink of nearly 70°, coated DNA is expected to be largely extended because of compensation of repetitive kinks with helical symmetry.
authors.affiliation: Departments of Chemistry and Biological Sciences, University of Alabama in Huntsville , Huntsville, Alabama 35899, United States.
authors.forename: Gokul
authors.initials: G
authors.lastname: Turaga
authors.affiliation: Departments of Chemistry and Biological Sciences, University of Alabama in Huntsville , Huntsville, Alabama 35899, United States.
authors.forename: Stephen P
authors.initials: SP
authors.lastname: Edmondson
authors.affiliation: Departments of Chemistry and Biological Sciences, University of Alabama in Huntsville , Huntsville, Alabama 35899, United States.
authors.forename: Kelley
authors.initials: K
authors.lastname: Smith
authors.affiliation: Departments of Chemistry and Biological Sciences, University of Alabama in Huntsville , Huntsville, Alabama 35899, United States.
authors.forename: John W
authors.initials: JW
authors.lastname: Shriver
mesh_terms: D000465:Algorithms; D019843:Archaeal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002843:Chromatin / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002942:Circular Dichroism; D018360:Crystallography, X-Ray; D003545:Cysteine / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D019641:DNA, Archaeal / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D005818:Genetic Engineering; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009154:Mutation; D009690:Nucleic Acid Conformation; D011485:Protein Binding; D000072417:Protein Domains; D055503:Protein Multimerization; D017433:Protein Structure, Secondary; D016945:Sulfolobus acidocaldarius / Q000235:genetics / Q000378:metabolism*
chemical_list: D019843:Archaeal Proteins; D002843:Chromatin; D019641:DNA, Archaeal; D004268:DNA-Binding Proteins; C095116:Sac7 protein, Sulfolobus; D003545:Cysteine