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On the universality of nuclear pore complex structure

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Summary

Substructural details of the nuclear pore complex were studied in diverse plant and animal cells with both section technique and negative staining of isolated nuclear envelope pieces. The structures observed after the different techniques, including a variety of fixation procedures, are compared and their significance is discussed. It is shown that, down to the 15–20 Å level, the architecture of the nuclear pore complex is universal among such diverse cell types as from, e. g., onion root tips, bean leaves, mammalian liver parenchyma, HeLa cell cultures, and amphibian germ material. The fundamental substructures of the pore complex such as (1) the annular granules, (2) the fibrils attached to the annuli, (3) the central granules, (4) the fibrils in the pore interior including those which make up the “inner ring” and/or those which connect the central granule to the pore margin, are recognized in all cell types studied. The dynamic variability of the central granule morphology is emphasized and observations are presented which suggest that the view of such centrally located material as representing ribonucleoproteins in a transitory state of nucleocytoplasmic migration can be extended to generality. General concepts of the nuclear pore complex structure are presented as alternative model views revealing either a more compact, predominantly granular, or a more fibrillar aspect.

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  1. Department of Cell Biology, Institute of Biology II, University of Freiburg i. Br., Deutschland

    Werner W. Franke

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The author gratefully acknowledges the frequent discussions and cooperation with his team-colleagues Drs. H. Falk (in the work on leaf material) and U. Scheer (in working with amphibian oocytes) as well as the skillful technical assistance of Miss Marianne Winter and Miss Sigrid Krien. The work was supported by the Deutsche Forschungsgemeinschaft.

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Franke, W.W. On the universality of nuclear pore complex structure. Z. Zellforsch. 105, 405–429 (1970). https://doi.org/10.1007/BF00335464

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