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We demonstrated two different DNA-dependent RNA polymerase (RNAP) α subunits in spores of Streptomyces granaticolor with apparent molecular masses of 40 and 43 kDa. The 43-kDa subunit was also found in vegetative cells. These two proteins are highly similar to each other as well as to other bacterial RNAP α subunits. The 40-kDa subunit is shortened from its C-terminus, in the portion of the protein,...
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