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- W2034976428 abstract "The genes encoding the cellulases Cel5A, Cel8C, Cel9E, Cel48F, Cel9G, and Cel9M from Clostridium cellulolyticum were cloned in the C. acetobutylicum expression vector pSOS952 under the control of a Gram-positive constitutive promoter. The DNA encoding the native leader peptide of the heterologous cellulases was maintained. The transformation of the solventogenic bacterium with the corresponding vectors generated clones in the cases of Cel5A, Cel8C, and Cel9M. Analyses of the recombinant strains indicated that the three cellulases are secreted in an active form to the medium. A large fraction of the secreted cellulases, however, lost the C-terminal dockerin module. In contrast, with the plasmids pSOS952-cel9E, pSOS952-cel48F, and pSOS952-cel9G no colonies were obtained, suggesting that the expression of these genes has an inhibitory effect on growth. The deletion of the DNA encoding the leader peptide of Cel48F in pSOS952-cel48F, however, generated strains of C. acetobutylicum in which mature Cel48F accumulates in the cytoplasm. Thus, the growth inhibition observed when the wild-type cel48F gene is expressed seems related to the secretion of the cellulase. The weakening of the promoter, the coexpression of miniscaffoldin-encoding genes, or the replacement of the native signal sequence of Cel48F by that of secreted heterologous or endogenous proteins failed to generate strains secreting Cel48F. Taken together, our data suggest that a specific chaperone(s) involved in the secretion of the key family 48 cellulase, and probably Cel9G and Cel9E, is missing or insufficiently synthesized in C. acetobutylicum." @default.
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- W2034976428 date "2011-05-01" @default.
- W2034976428 modified "2023-10-18" @default.
- W2034976428 title "The Issue of Secretion in Heterologous Expression of Clostridium cellulolyticum Cellulase-Encoding Genes in Clostridium acetobutylicum ATCC 824" @default.
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- W2034976428 doi "https://doi.org/10.1128/aem.03012-10" @default.
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