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The Journal of Cell Biology, Vol 95, 648-653, Copyright © 1982 by The Rockefeller University Press
ARTICLES |
RA Milligan and PN Unwin
A new two-dimensional ribosome crystal, having the tetragonal space group P42(1)2 (a = 593 A), has been grown from ribosome tetramers extracted from hypothermic chick embryos. It is of particular interest because of its larger size (up to 3 x 3 micron2) and greater stability compared to other related polymorphic forms, and because it can easily be grown in large amounts. X-ray diffraction shows the order in the crystal to extend to a resolution of at least 60 A. The crystalline ribosomes appear to contain a full complement of small and large ribosomal subunit proteins and an additional four proteins not characteristic of chick embryo polysomes.
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