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. 1983 Nov;80(22):6735–6739. doi: 10.1073/pnas.80.22.6735

Inhibition of transcription in somatic cells by microinjection of antibodies to chromosomal proteins.

L Einck, M Bustin
PMCID: PMC390060  PMID: 6196774

Abstract

The in vivo function of defined chromosomal proteins was examined by microinjecting purified antibody and antibody fragments into living fibroblasts. The involvement of histones and chromosomal high mobility group proteins HMG-1, 2, and 17 in transcription was visualized by studying the [3H]uridine incorporation in KD human fibroblasts after microinjection of fluoresceinated antibodies to these proteins. Nuclear uridine incorporation was not affected by microinjection of control antibodies or by the presence of immune complexes formed after microinjection of antibodies to chromosomal proteins that are not involved in transcription. In contrast, injection of anti-histone IgG, F(ab')2, or Fab and anti-HMG-17 IgG causes a significant reduction in transcription. The reduction is proportional to the amount of antibody introduced into the cell. We conclude that histones and protein HMG-17 are present on transcribed regions of the genome and that passage of RNA polymerase along the chromatin fiber is prevented by antibody binding to these proteins.

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Selected References

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