Abstract
The chromosomal region encoding the secY gene of Streptomyces griseus N2-3-11 was cloned and analyzed. The secY gene encodes a polypeptide of 438 aa with a molecular mass of 47.5 kDa. The transcriptional start point of the secY gene was determined. Northern blot analysis revealed a growth phase-dependent secY expression supporting our previous findings for secA gene expression in S. griseus. Overproduction of the SecY protein was obtained when using Streptomyces lividans TK23 as host. The interaction of the SecY proteins of S. griseus, S. lividans, and Escherichia coli, respectively, with the purified SecA protein of S. griseus was demonstrated for the first time by using ligand affinity blot assays.
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