An improved large scale fractionation of high mobility group non-histone chromatin proteins.

Biochimica Et Biophysica Acta
G H GoodwinE W Johns

Abstract

1. Methodology is presented for the large scale preparation and fractionation of high mobility group proteins from calf thymus chromatin. The total high mobility group protein from approx. 1 kg calf thymus tissue can be separated into five fractions by CM-Sephadex C25 ion-exchange chromatography. High mobility group proteins 1 and 2 comprise two fo the fractions. From a third fraction two more chromatin proteins, protein 3 and 17, can be isolated by trichloroacetic acid precipitation and CM-cellulose chromatography at pH 5.5. 2. The four proteins thus purified are lysine-rich proteins. Proteins 1 and 2 are additionally characterised by their high contents of acidic amino acids, as described previously (Goodwin, G. H. and Johns, E. W. (1973) Eur. J. Biochem. 40, 215-219). Proteins 3 and 17, having lower contents of acidic amino acids, are basic proteins similar to the histones. All four proteins exhibit single N-terminal amino acids; glycine is the N-terminal group of proteins 1, 2 and 3; protein 17 has a proline N-terminal amino acid. The proteins are not highly phosphorylated nor are they associated with appreciable quantities of nucleic acid.

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