title: Construction of a low-temperature protein expression system using a cold-adapted bacterium, Shewanella sp. strain Ac10, as the host.
abstract: A recombinant protein expression system working at low temperatures is expected to be useful for the production of thermolabile proteins. We constructed a low-temperature expression system using an Antarctic cold-adapted bacterium, Shewanella sp. strain Ac10, as the host. We evaluated the promoters for proteins abundantly produced at 4 degrees C in this bacterium to express foreign proteins. We used 27 promoters and a broad-host-range vector, pJRD215, to produce beta-lactamase in Shewanella sp. strain Ac10. The maximum yield was obtained when the promoter for putative alkyl hydroperoxide reductase (AhpC) was used and the recombinant cells were grown to late stationary phase. The yield was 91 mg/liter of culture at 4 degrees C and 139 mg/liter of culture at 18 degrees C. We used this system to produce putative peptidases, PepF, LAP, and PepQ, and a putative glucosidase, BglA, from a psychrophilic bacterium, Desulfotalea psychrophila DSM12343. We obtained 48, 7.1, 28, and 5.4 mg/liter of culture of these proteins, respectively, in a soluble fraction. The amounts of PepF and PepQ produced by this system were greater than those produced by the Escherichia coli T7 promoter system.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto, Japan.
authors.forename: Ryoma
authors.initials: R
authors.lastname: Miyake
authors.forename: Jun
authors.initials: J
authors.lastname: Kawamoto
authors.forename: Yun-Lin
authors.initials: YL
authors.lastname: Wei
authors.forename: Masanari
authors.initials: M
authors.lastname: Kitagawa
authors.forename: Ikunoshin
authors.initials: I
authors.lastname: Kato
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kurihara
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Esaki
mesh_terms: D000222:Adaptation, Physiological; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods; D003080:Cold Temperature; D017931:DNA Primers; D020564:Deltaproteobacteria / Q000201:enzymology / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005959:Glucosidases / Q000235:genetics / Q000378:metabolism; D018869:Heat-Shock Response; D010447:Peptide Hydrolases / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*; D020592:Shewanella / Q000201:enzymology* / Q000235:genetics / Q000502:physiology
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D011994:Recombinant Proteins; D005959:Glucosidases; D010447:Peptide Hydrolases