Nucleic Acids Research, 1988, Vol. 16, No. 10 4525-4538
© 1988
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ProteinDNA crosslinking in reconstituted nucleohistone, nuclei and whole cells by picosecond UV laser irradiation
Institute of Molecular Biology Bulgarian Academy of Sciences 1113 Sofia, Bulgaria 1Institute of Solid State Physics, Bulgarian Academy of Sciences 1113 Sofia, Bulgaria
* To whom correspondence should be addressed
Received December 11, 1987. Revised April 14, 1988. Accepted April 14, 1988.
A picosecond UV laser was used to cross-link proteins to DNA in nuclei, whole cells and reconstituted nucleohistone. Irradiation of the nucleohistone resulted in crosslinking 1520% of bound histones to DNA in a very short time (one or several picosecond pulses), the efficiency of crosslinking to single stranded DNA being higher than to double stranded DNA. All histones as well as high mobility group 1 proteins were identified in the covalently linked protein-DNA complexes upon irradiation of isolated nuclei and whole cells. A method is suggested for isolation of crosslinked material from cells and nuclei in amounts sufficient for further analysis. Experiments with reconstituted nucleohistones showed that upon irradiation at a constant dose the efficiency of crosslinking depended on the intensity of the light, thus suggesting a two-quantum process is involved in the reaction.
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