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The sprA and sprB genes, encoding thechymotrypsin-like proteases Streptomyces griseus protease A(SGPA) and Streptomyces griseus protease B (SGPB), and thesprT gene that encodes Streptomyces griseus trypsin (SGT)were cloned from S. griseus and were overexpressed invarious strains of S. griseus. When the sprT gene wasintroduced into S. griseus, trypsin activity increased 2-fold inthe A-factor deficient mutant strain, S. griseus HH1, andincreased 4-fold in the wild strain, S. griseus IFO13350.However, there was no detectable increase of chymotrypsinactivity in the transformants of S. griseus with either sprAor sprB, in contrast to the results obtained from S. lividans asa heterologous host. To solve the negative gene dosage effectsin S. griseus, either the sprA or the sprB genes with their ownribosome binding sites were linked to the downstream ofthe entire sprT gene, and the coexpression efficiency wasexamined in S. lividans and S. griseus. The transformants ofS. lividans with either pWHM3-TA (sprT+sprA) or pWHM3-TB (sprT+sprB) showed 3-fold increase of trypsin activityover that of the control, however, only the transformant ofpWHM3-TB demonstrated 7-fold increase in chymotrypsinactivity, indicating that the pWHM3-TB has a successfulconstruction for the overexpression of chymotrypsin inStreptomyces. When the coexpression vectors were introducedinto S. griseus IFO 13350, the trypsin level sharply increasedby more than 4-fold, however, the chymotrypsin level didnot increase. These results strongly suggest that theoverexpression of the sprA and sprB genes is tightly regulatedin S. griseus.

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