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- W2964312417 abstract "Bacterial secretory proteins often require the formation of disulphide bonds outside the cell to acquire an active conformation. Thiol-disulphide oxidoreductases are enzymes that catalyse the formation of disulphide bonds. The bacterium Streptomyces lividans is a well-known host for the efficient secretion of overproduced homologous and heterologous secretory proteins of industrial application. Therefore, the correct conformation of these extracellular proteins is of great importance when engineering that overproduction.We have identified four acting thiol-disulphide oxidoreductases (TDORs) in S. lividans TK21, mutants in all TDOR candidates affect the secretion and activity of the Sec-dependent alpha-amylase, which contains several disulphide bonds, but the effect was more drastic in the case of the Sli-DsbA deficient strain. Thus, the four TDOR are required to obtain active alpha-amylase. Additionally, only mutations in Sli-DsbA and Sli-DsbB affect the secretion and activity of the Tat-dependent agarase, which does not form a disulphide bond, when it is overproduced. This suggests a possible role of the oxidised Sli-DsbA as a chaperone in the production of active agarase.Enzymes involved in the production of the extracellular mature active proteins are not fully characterised yet in Streptomyces lividans. Our results suggest that the role of thiol-disulphide oxidoreductases must be considered when engineering Streptomyces strains for the overproduction of homologous or heterologous secretory proteins of industrial application, irrespective of their secretion route, in order to obtain active, correctly folded proteins." @default.
- W2964312417 created "2019-07-30" @default.
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- W2964312417 date "2019-07-25" @default.
- W2964312417 modified "2023-10-16" @default.
- W2964312417 title "Four thiol-oxidoreductases involved in the formation of disulphide bonds in the Streptomyces lividans TK21 secretory proteins" @default.
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- W2964312417 doi "https://doi.org/10.1186/s12934-019-1175-0" @default.
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