DETECTION OF PROTEINS SYNTHESIZED IN THE CAP CELLS OF COPRINUS CINEREUS

Abstract

Four proteins with molecular weights of 74, 000, 72, 000, 70, 000, and 68, 000 were readily detected by gel electrophoresis in the cap cells of the mature fruit bodies of Coprinus cinereus. But they were barely detectable in the stipe cells. The cap proteins were purified together and had a similar isoelectric point at around 8.0. They were all glycoproteins, and peptide mapping indicated that they shared common polypeptides. As measured by the immunoblotting method using antisera against them, these proteins were abundant in cap cells but extremely rare in stipe cells, in the primordia of fruit bodies, and in the mycelia of monokaryotic Fis^cl and dikaryotic strains.