Compact structure of ribosomal chromatin inXenopus laevis
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چکیده
منابع مشابه
Compact structure of ribosomal chromatin in Xenopus laevis.
Micrococcal nuclease digestion was used as a tool to study the organization of the ribosomal chromatin in liver, blood and embryo cells of X. laevis. It was found that in liver and blood cells, ribosomal DNA is efficiently protected from nuclease attack in comparison to bulk chromatin. Although ribosomal chromatin is fragmented in a typical nucleosomal pattern, a considerable portion of ribosom...
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Transcription of the major ribosomal RNAs by Pol I (RNA polymerase I) is a key determinant of ribosome biogenesis, driving cell growth and proliferation in eukaryotes. Hundreds of copies of rRNA genes are present in each cell, and there is evidence that the cellular control of Pol I transcription involves adjustments to the number of rRNA genes actively engaged in transcription, as well as to t...
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The structure of compact 30-nm chromatin fibres is still debated. We present here a novel unified model that reconciles all experimental observations into a single framework. We propose that compact fibres are formed by the interdigitation of the two nucleosome stacks in a 2-start crossed-linker structure to form a single stack. This process requires that the dyad orientation of successive nucl...
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In Xenopus laevis the coordinated synthesis of the over 80 ribosomal proteins (r-proteins) is attained by both post-transcriptional and translational level regulation (1, 2). Also several r-protein genes analyzed present structural similarities probably involved in the common regulatory mechanisms. Our understanding, however, of the structure and expression of these genes is based on the analys...
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The base sequence analysis of a Xenopus laevis ribosomal DNA repeat (7) has been extended to cover almost the entire non-transcribed and external transcribed spacer. A compilation of these sequences is presented. All the repetitive and non-repetitive sequence elements of the spacer are identified and their evolution discussed. Comparison of the X.laevis and S.cerevisiae (25,26) ribosomal DNAs s...
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ژورنال
عنوان ژورنال: Nucleic Acids Research
سال: 1984
ISSN: 0305-1048,1362-4962
DOI: 10.1093/nar/12.6.2691