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Vol. 12, Issue 11, 3340-3352, November 2001
-Tubulin Complex



§
and
*Departments of Biological Sciences and Genetics, Stanford
University, Stanford, California 94305-5020; The
Genentech,
Inc., South San Francisco, California 94080; and
Department of Biochemistry and Biophysics,
§Howard Hughes Medical Institute, University of
California, San Francisco, California 94143
-tubulin complex is a large multiprotein complex that is
required for microtubule nucleation at the centrosome. Here we report
the purification and characterization of the human
-tubulin complex
and the identification of its subunits. The human
-tubulin complex
is a ring of ~25 nm, has a subunit structure similar to that reported
for
-tubulin complexes from other species, and is able to nucleate
microtubule polymerization in vitro. Mass spectrometry analysis of the
human
-tubulin complex components confirmed the presence of four
previously identified components (
-tubulin and
-tubulin complex
proteins [GCPs] 2, 3, and 4) and led to the identification of two new
components, GCP5 and GCP6. Sequence analysis revealed that the GCPs
share five regions of sequence similarity and define a novel protein
superfamily that is conserved in metazoans. GCP5 and GCP6, like other
components of the
-tubulin complex, localize to the centrosome and
associate with microtubules, suggesting that the entire
-tubulin
complex takes part in both of these interactions. Stoichiometry
experiments revealed that there is a single copy of GCP5 and multiple
copies of
-tubulin, GCP2, GCP3, and GCP4 within the
-tubulin
complex. Thus, the
-tubulin complex is conserved in structure and
function, suggesting that the mechanism of microtubule nucleation is conserved.
Corresponding author. E-mail address:
stearns{at}stanford.edu.
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