Electrophoretic studies of non-histone proteins from pig lymph nodes

Purified chromatin from pig lymph nodes has been prepared and used for the isolation of chromatin proteins and non-histine proteins. Saccharose nuclei from this tissue have been used for the preparation of nuclear phenol-soluble phosphoproteins. The isolated proteins have been compared by analytical electrophoresis in polyacrylamide gel in sodium dodecyl sulfate. Most chromatin non-histone proteins and nuclear phosphoproteins of pig lymph nodes have a molecular weight about 40 000 daltons and show a significant degree of homology of molecular range from 40 000 to 90 000 daltons. The phosphoproteins have been also analyzed by isoelectric focusing in polyacrylamide gel over the pH range of 3-10. They are distributed throughout the pI range of 5.8-9.0. The chromatin non-histone proteins and phosphoproteins are of acidic nature and contain 0,97 per cent tryptophan.