Abstract
A regulative two-component system previously identified in Pseudoalteromonas haloplanktis TAC125 was used to construct a cold inducible expression system that is under the control of l-malate. Performances of the inducible system were tested for both psychrophilic and mesophilic protein production using two "difficult" proteins as control. The results obtained demonstrated that both psychrophilic beta-galactosidase and yeast alpha-glucosidase are produced in a fully soluble and catalytically competent form. Optimal conditions for protein production, including growth temperature, growth medium and l-malate concentration were also investigated. Under optimized conditions yields of 620 and 27 mg/l were obtained for beta-galactosidase and alpha-glucosidase, respectively.
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