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J. Biochem, 1988, Vol. 103, No. 6 928-937
© 1988 Japanese Biochemical Society

research-article

Purification and Characterization of a 400-kDa Nonhistone Chromatin Protein That Serves as an Effective Phosphate Acceptor for Casein Kinase II from Ehrlich Ascites Tumor Cells1

Tsuneaki Koike2 and Kenzo Ohtsuki3

Department of Bacteriology, Tohoku University School of Medicine Sendai, Miyagi 980

3To whom correspondence should be addressed at: Department of Bio-Science, School of Hygienic Sciences, Kitasato University, Sagamihara, Kanagawa 228.

A nonhistone chromatin protein (NHCP) has been purified to homogeneity from a 0.5 M NaCl extract of Ehrlich ascites tumor cell (EAT cell) nuclei as a phosphate acceptor for casein kinase II using ion-exchange column chromatographies and Sephacryl S300 gel filtration. The purified NHCP (approximate Mr= 400,000) was found to be a tetramer of an Mr = 98,000 polypeptide (pI = 6.9) and to have high contents of glycine (15%) and serine (11.6%). This protein (designated as 400-kDa NHCP) was highly phosphorylated by casein kinase II (Mr = 130,000), but not by histone kinase. Casein kinase II phosphorylated only seryl residues of the purified 400-kDa NHCP. The NHCP bound with DNA, but not with RNAs, and the DNA binding ability of the protein was reduced when it was phosphorylated by casein kinase II. Moreover, we found that (a) the 400-kDa NHCP is present in large quantities in malignant mouse cells, such as EAT, EL-4, and Meth-A cells, but only slightly in normal tissues and cells; (b) the protein level is rapidly increased when mouse lymphocytes are treated with recombinant interleukin 2 (T cell growth factor) or concanavalin A; and (c) the kinase responsible for the 400-kDa NHCP phosphorylation in the chromatin of various mouse cells is a casein kinase II. These experimental results suggest that the 400-kDa NHCP acts as an effective phosphate acceptor for casein kinase II at the chromatin level and that an increased phosphorylation of the protein by the kinase may be implicated in the progress of cell differentiation and proliferation.

1This work was supported in part by grants from the Ministry of Education, Science and Culture of Japan (1985) and from the Sendai Microbiology Institute.

2Present address: Chugai Biomedical Institute, Toshima-ku, Tokyo 171.


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