Unformatted text preview: c. See Table 2-4 Assembly/disassembly of Tubulin dimers
in Microtubules occur VERY dynamically -constantly happening.
THE LUMENS IN MICROTUBULES
HAVE NO KNOWN FXN! (quite variable) Keratin important for EPITHELIAL CELLS. MUCH MORE STABLE THAN THE OTHER 2 IN THE CYTOPLASM!
ONCE ASSEMBLED, SLOW TO DISASSABLE. MAKE CELL STRONG. Integral membrane proteins called integrins serve to link indirectly the actin
filaments to protein fibers outside the cell. INTEGRINS… KNOW THIS!!!!!!!!!!!! cytoskeleton often showed in immunohistochemistry staining. Figs. 2-22 & 2-27 All cytoskeletal elements are
best seen by TEM (a) or immunohistochemistry (b). Shown in b
are microfilaments and microtubules with the actin filaments in
red and microtubules in green.
(The nucleus is blue, with a blue
fluorescent dye binding the DNA.)
Intermediate filaments made of
keratin are abundant in most
epithelial cells as shown in c (TEM). c Centrioles, which
organize MTs to form
the mitotic spindle
during cell division,
each have 9 sets of MT...
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- Spring '14