Characterization of mononucleosomes and associated glycoproteins from Ehrlich ascites tumour cells.

Mononucleosomes generated by the digestion of ascites nuclei with micrococcal nuclease were resolved into three types by polyacrylamide gel electrophoresis. All three types were present in early and late digest and a precursor-product relationship was not apparent. Each mononucleosome type was associated with a unique pattern of subnucleosome DNA fragments and differences were apparent in histone and nonhistone proteins. On the basis of reactivity ot 125I-labelled concanavalin A and labelling with [3H]glucosamine, glycoproteins were identified as components of two of the mononucleosome types. The principal glycoprotein species associated with mononucleosomes had an apparent molecular weight of 130 000.