Purification of DNA-dependent RNA polymerase fromStreptomyces granaticolor

Abstract
RNA nucleotidyltransferase (EC 2.7.7.6) ofStreptomyces granaticolor was purified by precipitation with polymin P and ammonium sulphate, affinity chromatography on DNA-cellulose and gell filtration on Biogel A 1.5 m. SDS-polyacrylamide gel electrophoresis revealed 8 protein bands of molar mass ranging from 37 to 130 kg/mol. Proteins of molar mass of 130 and 120 kg/mol were identified to be β and β subunits, respectively. The role of other subunits of the enzyme is discussed.