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RNA polymerase II from larvae of the brine shrimp, Artemia salina, was highly purified by two cycles of DEAE-cellulose chromatography followed by centrifugation through discontinuous sucrose gradients. Gradient fractions were subjected to elctrophoresis is polyacrylamide gels containing sodium dodecyl sulfate. The subunit structure of RNA polymerase II was determined by quantitative comparison of the polypeptides and enzyme activity present in each gradient fraction. The enzyme contains one copy of each of four subunits with estimated molecular weights of 170,000, 130,000, 36,000 and 24,000. The total molecular weight agrees well with the molecular weight estimated for the native enzyme by density gradient centrifugation.

DNA-dependent RNA polymerases from Artemia salina. Subunit structure of polymerase II