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Journal of Cell Science, Vol 98, Issue 4 577-588, Copyright © 1991 by Company of Biologists
JOURNAL ARTICLES |
DD Vandre, VE Centonze, J Peloquin, RM Tombes and GG Borisy
Laboratory of Molecular Biology, University of Wisconsin, Madison 53706.
The phosphoprotein composition of isolated CHO spindles was analyzed using the MPM-1 and MPM-2 antibodies, which are reactive with a phosphorylated epitope enriched in mitotic cells and present on the centrosome, kinetochores, midbody and fibers of the mitotic spindle. Several high molecular weight phosphorylated spindle proteins were detected on immunoblots, including species of 410 x 10(3) Mr, 350 x 10(3) Mr, a 230-240 X 10(3) Mr doublet, 210 x 10(3) Mr and 120 x 10(3) Mr. The temporal and spatial distribution of the MPM-reactive phosphoproteins was determined by examining spindle structures isolated from cells at various stages of mitosis. The susceptibility of the staining pattern to extraction with salt, a procedure known to remove most microtubule-associated proteins (MAPs), was also examined. The phosphorylated 210 x 10(3) Mr species was identified as MAP-4 and localized to the spindle fibers using (1) a polyclonal antibody raised against this species, that reacted with known MAPs, and (2) established MAP-4 antibodies that reacted with the spindle 210 x 10(3) Mr MPM-reactive proteins. The comparative immunoblot and immunofluorescence analysis establishes a cycle of phosphorylation/dephosphorylation of MAP-4 upon entry and exit from mitosis. Regarding the other MPM-reactive proteins, comparative immunofluorescence staining and immunoblot analysis of isolated spindle samples before and after salt extraction indicate that they may be constituents of the centrosome, kinetochores or midbody, but their definitive identification awaits the production of monospecific antibodies.
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