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. 1981 Mar;67(3):438–444. doi: 10.1104/pp.67.3.438

Purification and Subunit Structure of DNA-dependent RNA Polymerase III from Wheat Germ 1

Jerry Jendrisak 1
PMCID: PMC425701  PMID: 16661690

Abstract

A rapid and simple, large-scale method for the purification of DNA-dependent RNA polymerase III (EC 2.7.7.6) from wheat germ is presented. The method involves enzyme extraction at low ionic strength, polyethyleneimine fractionation, (NH4)2SO4 precipitation, and chromatography on DEAE-Sepharose CL-6B, DEAE-cellulose, and heparin agarose. Milligram quantities of highly purified enzyme can be obtained from kilogram quantities of starting material in 2 to 3 days. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicates that RNA polymerase III contains 14 subunits with molecular weights of: 150,000; 130,000; 94,000; 55,000; 38,000; 30,000; 28,000; 25,000; 24,500; 20,500; 20,000; 19,500; 17,800; and 17,000. Subunit structure comparison of wheat germ RNA polymerases I, II, and III indicates that all three enzymes may contain common subunits with molecular weights 20,000, 17,800, and 17,000. In addition, RNA polymerases II and III may contain a common subunit with a molecular weight of 25,000, and RNA polymerases I and III may contain a common subunit with a molecular weight of 38,000.

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Selected References

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