By A. A. Bayev, K. G. Skryabin, V. M. Zaharyev, A. S. Krayev, P. M. Rubtsov (auth.), Francesco Salvatore, Gennaro Marino, Pietro Volpe (eds.)
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Acad. Sci. USA zg, 1007 (1975). 35. , and Blobel, G. J. Cell Biol. ZQ, 581 (1976). 36. , and Chi-Bom Chae Biochemistry 12, 180 (1976). 37. C. Biochemistry 12, 180 (1976). 38. B. J. Cell Biol. 22, 406a (1977). 39. Y. Ultrastruktura Kletochnogo Yadra (Ultrastructure of the Cell Nucleus), Nauka, Moscow, 1974. 40. N. Tsitologiya 18, 261 (1976). 41. , and Parfenov, V,N. J. Cell Sci. 28, 1 (1977). THE PHYSICAL MAP OF THE VARIOUS TRANSCRIPTS OF RAT LIVER MITOCHONDRIAL DNA + + x + C. Saccone, G. Pepe , H.
I - • - . rRNA +t RNA Figure 3. Hybridization of high molecular weight mtRNA with various restriction fragments of mtDNA. Strip-filters containing thg denatured restriction fragments of rat liver mtDNA were incubated with l25r-iodinated mtRNA (14xlO cpm/~g). The positions of the various fragments visible on the autoradiograms are indicated by the black lines. The experiments were performed either in absence or in the presence of cold mt rRNA (40 pg) and/or tRNA (80 pg) as competitor. I I; I' . rR"A rRNA +tRNA CJ) » !
The latter is in a good agreement with a high accessibility of the minor groove of DNA in chromatin to a reporter molecule (13) and to the antibiotics netropsin and distamycin A (I4,I5). This shielding is hardly related to the organization of histones in nucleosomes since the same shielding of the major groove by I5-I8% has been demonstrated in the complexes of DNA reconstituted with individual histone fractions H2A, H2B, H3, H4. On the contrary, histone HI is unlikely to shield any DNA grooves (16).
