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Nucleic Acids Research, 1985, Vol. 13, No. 2 355-367
© 1985

Articles

Complexes of viroids with histones and other proteins

Petra Wolff, Ruth Gilz, Jurgen Schumacher and Detlev Riesner

Institut für Physikalische Biologie, University Düsseldorf, Universitätsstrasse 1, D-4000 Düsseldorf 1, FRG

Received November 22, 1984. Accepted January 3, 1985.

Complexes of potato spindle tuber viroid (PSTV) with nuclear proteins have been studied by in vitro reconstitution of the complexes and by isolation and characterization of in vivo complexes under non-dissociating conditions. For in vitro reconstitution, nuclear proteins were separated by SDS-gelelectro-phoresis, renatured and blotted onto nitrocellulose filters, and incubated with viroid. The viroid-protein complexes were crosslinked covalently, and the viroid containing protein bands were detected by northern hybridization with a radioactive cONA probe. The histones, a 41,000 dalton protein and to a small extent a 31,000 dalton protein were found in complexes with viroids. Raising the strength to 0.4 M NaCl destroys the complexes with the 41,000 dalton proteins but not those with the histones.

From nucleoli, which are known to obtain the majority of viroids under non-dissociating conditions (Schumacher et al., (1983) EMBO 3. 2, 1549–1555), a nucleosomal fraction was prepared. Viroids were found predominantly in this nucleosomal fraction. They are bound in a complex of 12–15 svedberg units.


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