title: Characterization and in vitro interaction study of a [NiFe] hydrogenase large subunit from the hyperthermophilic archaeon Thermococcus kodakarensis KOD1.
abstract: The large subunit of the [NiFe] hydrogenases harbors a NiFe(CN)(2)(CO) cluster. Maturation proteins HypA, B, C, D, E, and F are required for the NiFe cluster biosynthesis. While the maturation machinery has been hitherto studied intensively, little is known about interactions between the Hyp proteins and the large subunit of the [NiFe] hydrogenase. In this study, we have purified and characterized the cytosolic [NiFe] hydrogenase large subunit HyhL from Thermococcus kodakarensis (Tk-HyhL). Tk-HyhL exists in equilibrium between monomeric and dimeric forms. In vitro interaction analyses showed that Tk-HyhL monomer forms a tight complex with Tk-HypA and weakly interacts with Tk-HypC. The expected ternary complex formation was not detected. These observations reflect a diversity in the mechanism of Ni insertion in [NiFe] hydrogenase maturation depending on the organism.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Sasaki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Watanabe
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kanai
authors.forename: Haruyuki
authors.initials: H
authors.lastname: Atomi
authors.forename: Tadayuki
authors.initials: T
authors.lastname: Imanaka
authors.forename: Kunio
authors.initials: K
authors.lastname: Miki
mesh_terms: D006864:Hydrogenase / Q000737:chemistry*; D021122:Protein Subunits / Q000737:chemistry; D019712:Thermococcus / Q000201:enzymology*
chemical_list: D021122:Protein Subunits; C043296:nickel-iron hydrogenase; D006864:Hydrogenase