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J. Cell Biol.,
Volume 141, Number 4, May 18, 1998 967-977


* Medical Research Council (MRC) Laboratory of Molecular Biology, Cambridge CB2 2QH, United Kingdom; and A highly enriched spindle pole preparation
was prepared from budding yeast and fractionated by
SDS gel electrophoresis. Forty-five of the gel bands
that appeared enriched in this fraction were analyzed
by high-mass accuracy matrix-assisted laser desorption/ ionization (MALDI) peptide mass mapping combined
with sequence database searching. This identified twelve of
the known spindle pole components and an additional
eleven gene products that had not previously been localized to the spindle pole. Immunoelectron microscopy localized eight of these components to different
parts of the spindle. One of the gene products, Ndc80p,
shows homology to human HEC protein (Chen, Y.,
D.J. Riley, P-L. Chen, and W-H. Lee. 1997. Mol. Cell
Biol. 17:6049-6056) and temperature-sensitive mutants
show defects in chromosome segregation. This is the first report of the identification of the components of a large
cellular organelle by MALDI peptide mapping alone.
European
Molecular Biology Laboratory (EMBL), D 69117 Heidelberg, Germany
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