title: Identification of the 190 kD microtubule-associated protein in cultured fibroblasts and its association with interphase and mitotic microtubules.
abstract: We previously investigated the biochemical characteristics of microtubule-associated proteins (MAPs) of the adrenal medulla and adrenal cortex and found that they contain a new kind of MAP with a molecular weight of 190,000 (190 kD MAP) as a major species (Kotani, S., H. Murofushi, S. Maekawa, C. Sato, and H. Sakai. Eur. J. Biochem. 156, 23-29, 1986). We now have used an affinity purified anti-(190 kD MAP) antibody and show by indirect immunofluorescent microscopy the association of this MAP with microtubules in situ in TIG-3 cells (human embryonic lung fibroblasts). The 190 kD MAP was present along the interphase and mitotic microtubules, and there was no marked difference between the staining pattern with anti-tubulin and that with anti-(190 kD MAP) antibodies, evidence that the localization of 190 kD MAP is not restricted to the subset of microtubules. We also isolated MAPs from TIG-3 cells and identified their 190 kD MAP as a major heat-stable component. Several other unidentified polypeptides were recovered in the MAP fraction specifically.
mesh_terms: D005347:Fibroblasts / Q000032:analysis / Q000648:ultrastructure; D005455:Fluorescent Antibody Technique; D006801:Humans; D008869:Microtubule-Associated Proteins / Q000302:isolation & purification* / Q000502:physiology; D008870:Microtubules / Q000378:metabolism*; D008970:Molecular Weight; D008941:Spindle Apparatus / Q000378:metabolism*
chemical_list: D008869:Microtubule-Associated Proteins