title: Two kinds of archaeal chaperonin with different temperature dependency from a hyperthermophile.
abstract: Thermococcus kodakaraensis KOD1 produces two kinds of chaperonin subunits, CpkA and CpkB. To monitor the expression levels of CpkA and CpkB, anti-CpkA and anti-CpkB antisera were obtained by using synthesized peptides as the haptens. These haptens were prepared based on the carboxyl terminus regions of CpkA and CpkB, which show clear differences in amino acid sequence. Immunoblotting analysis using obtained antisera revealed that the expression levels of CpkA and CpkB changed depending on the cultivation temperature. When cells were grown at 95 degrees C, intracellular amount of CpkA was low, while CpkB was expressed at extremely high level in KOD1. In the case of 70 degrees C cultivation, CpkA existed as the major chaperonin in the cell, whereas CpkB existed as the minor one. Temperature-shift experiments showed that the expression of CpkB was induced by the up-shift and reduced by the down-shift of temperature. In contrast, the expression of CpkA was reduced by the up-shift and induced by the down-shift of temperature. Furthermore, native PAGE and immunoprecipitation experiments revealed that the stoichiometrical ratio of CpkA and CpkB in chaperonin complex changed according to growth temperature.
authors.affiliation: Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Izumi
authors.forename: S
authors.initials: S
authors.lastname: Fujiwara
authors.forename: M
authors.initials: M
authors.lastname: Takagi
authors.forename: K
authors.initials: K
authors.lastname: Fukui
authors.forename: T
authors.initials: T
authors.lastname: Imanaka
mesh_terms: D000918:Antibody Specificity / Q000276:immunology; D019843:Archaeal Proteins / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D015153:Blotting, Western; D018833:Chaperonins / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D019848:Gene Expression Regulation, Archaeal; D006241:Haptens / Q000276:immunology; D046911:Macromolecular Substances; D018832:Molecular Chaperones / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*; D008970:Molecular Weight; D021122:Protein Subunits; D013696:Temperature; D019712:Thermococcus / Q000737:chemistry / Q000276:immunology / Q000378:metabolism*
chemical_list: D019843:Archaeal Proteins; C121476:CpkA protein, archaeal; D006241:Haptens; D046911:Macromolecular Substances; D018832:Molecular Chaperones; D021122:Protein Subunits; D018833:Chaperonins