Protein of pasture plants. Cytoplasmic protein of white clover and Italian ryegrass

Abstract

Soluble cytoplasmic proteins extracted from leaf cells of white clover and Italian ryegrass were studied by electrophoresis and ultra-centrifuging. These extracts were fractionated by high-speed centri-fuging, salt precipitation, acid precipitation and ethanol precipitation. A protein fraction which was monodisperse on electrophoresis and in the ultracentrifuge was isolated from clover leaf, and its molecular weight established as approximately 600,000. Close similarity is found to the types of protein reported in extracts from other plants. However, the monodisperse fraction from clover differs from that described from spinach and tobacco in that it is not associated with ribonucleic acid. Leaves of both monocotyledonous and dicotyledonous plants appear to contain the same types of soluble cytoplasmic protein.