title: Architecture and characterization of a thermostable MoxR family AAA(+) ATPase from Thermococcus kodakarensis KOD1.
abstract: AAA(+) ATPases are ubiquitous enzymes that can function as molecular chaperones, employing the energy obtained from ATP hydrolysis to remodel macromolecules. In this report, the MoxR enzyme from Thermococcus kodakarensis KOD1 (TkMoxR) was shown to have two native forms: a two-stack hexameric ring and a hexameric structure, under physiological conditions and cold stress, respectively. TkMoxR was altered to a microtubule-like form in the presence of ATP and tightly interacted with dsDNA molecules of various lengths. In addition, the two-stack hexameric protein catalyzed dsDNA decomposition to form and then release ssDNA, whereas the hexamer TkMoxR structure interacted with but did not release dsDNA. These results suggest that TkMoxR has DNA helicase activity involved in gene expression control.
authors.affiliation: Division of Applied Life Sciences, Gyeongsang National University, Jinju, 660-701, Korea.
authors.forename: Bang Phuong
authors.initials: BP
authors.lastname: Pham
authors.forename: Sangmin
authors.initials: S
authors.lastname: Lee
authors.forename: Baolei
authors.initials: B
authors.lastname: Jia
authors.forename: Jae Myeong
authors.initials: JM
authors.lastname: Kwak
authors.forename: Gang-Won
authors.initials: GW
authors.lastname: Cheong
mesh_terms: D000595:Amino Acid Sequence; D019843:Archaeal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004265:DNA Helicases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004795:Enzyme Stability; D006358:Hot Temperature; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D019712:Thermococcus / Q000201:enzymology* / Q000235:genetics
chemical_list: D019843:Archaeal Proteins; D004265:DNA Helicases