Abstract:
:During spindle pole body (SPB) duplication, the new SPB is assembled at a distinct site adjacent to the old SPB. Using quantitative fluorescence methods, we studied the assembly and dynamics of the core structural SPB component Spc110p. The SPB core exhibits both exchange and growth in a cell cycle-dependent manner. During G1/S phase, the old SPB exchanges approximately 50% of old Spc110p for new Spc110p. In G2 little Spc110p is exchangeable. Thus, Spc110p is dynamic during G1/S and becomes stable during G2. The SPB incorporates additional Spc110p in late G2 and M phases; this growth is followed by reduction in the next G1. Spc110p addition to the SPBs (growth) also occurs in response to G2 and mitotic arrests but not during a G1 arrest. Our results reveal several dynamic features of the SPB core: cell cycle-dependent growth and reduction, growth in response to cell cycle arrests, and exchange of Spc110p during SPB duplication. Moreover, rather than being considered a conservative or dispersive process, the assembly of Spc110p into the SPB is more readily considered in terms of growth and exchange.
journal_name
Mol Biol Celljournal_title
Molecular biology of the cellauthors
Yoder TJ,Pearson CG,Bloom K,Davis TNdoi
10.1091/mbc.e02-10-0655keywords:
subject
Has Abstractpub_date
2003-08-01 00:00:00pages
3494-505issue
8eissn
1059-1524issn
1939-4586pii
E02-10-0655journal_volume
14pub_type
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