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- W2000834086 abstract "Two DNA-dependent RNA polymerases have been purified from homogenates of maize leaves by a relatively rapid procedure involving Sepharose 4B and DEAE-cellulose chromatography followed by resolution of two RNA polymerasies on phosphocellulose. The RNA polymerase eluting from phosphocellulose at 0.11 M (NH4)2SO4 is inhibited strongly by low levels of α-amanitin and possesses catalytic properties and polypeptide subunits like those of maize nuclear RNA polymerase II. The RNA polymerase eluting from phosphocellulose at 0.15 M (NH4)2SO4 resembles the RNA polymerase solubilized from isolated maize chloroplasts in many ways. This enzyme and that isolated from chloroplasts are resistant to α-amanitin and rifamycin-SV at high concentrations. Both RNA polymerases have virtually the same Mn2+ and Mg2+ optima, Mg2+Mn2+ activity ratios, (NH4)2SO4 sensitivity, kinetics of UMP incorporation, and temperature optima. Electrophoresis of this phosphocellulose-purified RNA polymerase on denaturing polyacrylamide slab gels reveals 14 heavily stainable polypeptides that are identical in number and molecular mass to those from chloroplast RNA polymerase. Moreover, two-dimensional tryptic maps of the 14 polypeptides from the phosphocellulose-purified RNA polymerase are very similar to the maps of corresponding polypeptides from chloroplast RNA polymerase. Using this method, relatively large quantities (0.5 mg/kg leaves) of a form of chloroplast RNA polymerase can be prepared in a few days." @default.
- W2000834086 created "2016-06-24" @default.
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- W2000834086 date "1980-08-01" @default.
- W2000834086 modified "2023-09-27" @default.
- W2000834086 title "A facile procedure for purifying maize chloroplast RNA polymerase from whole cell homogenates" @default.
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- W2000834086 doi "https://doi.org/10.1016/0005-2787(80)90197-5" @default.
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