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The sprC gene encodes Streptomyces griseusprotease C (SGPC), a bacterial chymotrypsin-like serine protease.Because the published data on sprC was not complete, wecloned and analyzed a new DNA fragment spanning downstreamto upstream of the sprC gene from S. griseus IFO13350. Thecloned 2.3-kb DNA fragment was placed on a high-copynumber plasmid and introduced into Streptomyces lividansTK24. Chymotrypsin activity of the transformant was 8.5and stably maintained until 9 days of cultivation, whichclearly indicated that the cloned 2.3-kb fragment containedthe entire sprC gene with its own promoter. When the sameconstruct was introduced in the S. griseus IFO13350 (wildstrain) and its two mutant strains in the A-factor regulatorycascade, adpA and HO1, the chymotrypsin activity increasedfivefold only in the adpA strain. Transcriptional analysisbased on RT-PCR revealed that the sprC gene is normalytranscribed in both strains; however, earlier transcription wasobserved in the wild strain compared with the adpA strain.A gel mobility shift assay showed that the AdpA protein didnot bind to the promoter region of sprC. All these data clearlyindicate that the expression of sprC is not dependent on theAdpA protein, but is distinctly regulated from other chymotrypsingenes composing an AdpA regulon. Earlier morphologicaldiferentiation was observed in S. lividans TK24, and S. griseusIFO13350 and HO1, transformed with the expression vector.The transformant of S. griseus adpA formed markedly largercolonies. Antisense represion of sprC resulted in severe decreaseof chymotrypsin activity, down to one-third of the control, anddelayed morphological differentiation. All these data sugestthat SGPC is related to normal morphogenesis in S. griseus.

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