ISSN:
0886-1544
Keywords:
microtubule
;
microtubule-associated protein (MAP)
;
RNA
;
RNP
;
mitotic spindle
;
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
,
Medicine
Notes:
Microtubules were purified from unfertilized eggs of the sea urchins Arbacia punctulata, Lytechinus pictus, Lytechinus variegatus, and Strongylocentrotus purpuratus. Numerous densely stained particles (24 × 26 nm) are associated with microtubules isolated from each of these sea urchins. The most striking aspect of this structure is an extended, slightly curved arm that appears to attach the particles to the microtubule. Morphologically similar particles are associated with microtubules of the isolated first cleavage mitotic apparatus. The particles are attached to the microtubules by ionic interactions and contain large amounts of extractable RNA. Based upon their size and density, RNA and protein composition, and sedimentation in sucrose gradients, the microtubule-associated particles are identified as ribosomes.
Additional Material:
12 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cm.970140310