[Studies of basic proteins of 60S- and 40S-subunits of pea seed ribosomes by two-dimensional polyacrylamide gel electrophoresis]

Abstract

Basic proteins of 60S- and 40S-subunits of pea seed ribosomes were studied by two-dimensional electrophoresis in polyacrylamide gel (PAAG) with subsequent electrophoresis of separated proteins in the gels containing sodium dodecyl sulfate. The proteins under study were found to be electrophoretically heterogenous and showed considerable variations in the staining by amido black and a specific distribution between the two subunits. 47 protein components were detected in the protein preparations of the 60S subunit: 18--as intensively stained, 12--as moderately stained and 17--as weakly stained spots. Presumably, the 60S subunit does not contain proteins whose molecular weights are over 60.000 or below 14.000. Two proteins have mol. weight over 50.000; other proteins have mol. weights varying between 15.000 and 30.000. 32 proteins components were revealed in the protein preparations of the 40S subunit: 15--as intensively coloured, 8--as moderately coloured and 9--as weakly coloured spots. The 40S subunit does not contain proteins whose molecular weights are over 33.000 and below 10.000. Three proteins have mol. weights over 30.000, the other proteins have mol. weights within the interval of 15.000--30.000. The amount of basic proteins in the 80S plant ribosomes is, in all probability, higher as compared to that in animal ribosomes, and this is due to the 60S subunit.