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Published online 30 October 2000. doi:10.1083/jcb.151.3.613
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© The Rockefeller University Press, 0021-9525/2000/10/613/ $5.00
The Journal of Cell Biology, Volume 151, Number 3, October 30, 2000 613-626


Original Article

Pds5p Is an Essential Chromosomal Protein Required for both Sister Chromatid Cohesion and Condensation in Saccharomyces cerevisiae

Theresa Hartmana, Kristen Steada, Douglas Koshlandb, and Vincent Guaccia
a Fox Chase Cancer Center, Basic Science Division, Philadelphia, Pennsylvania 19111
b Carnegie Institution of Washington, Department of Embryology, Baltimore, Maryland 21210

Correspondence to: Vincent Guacci, Fox Chase Cancer Center, Basic Science Division, Room W462, 7701 Burholme Avenue, Philadelphia, PA 19111. Tel:(215) 728-5632 Fax:(215) 728-3616

The PDS5 gene (precocious dissociation of sisters) was identified in a genetic screen designed to identify genes important for chromosome structure. PDS5 is an essential gene and homologues are found from yeast to humans. Pds5p function is important for viability from S phase through mitosis and localizes to chromosomes during this cell cycle window, which encompasses the times when sister chromatid cohesion exists. Pds5p is required to maintain cohesion at centromere proximal and distal sequences. These properties are identical to those of the four cohesion complex members Mcd1p/Scc1p, Smc1p, Smc3p, and Scc3p/Irr1p (Guacci, V., D. Koshland, and A. Strunnikov. 1997. Cell. 91:47–57; Michaelis, C., R. Ciosk, and K. Nasmyth. 1997. Cell. 91:35–45; Toth, A., R. Ciosk, F. Uhlmann, M. Galova, A. Schleiffer, and K. Nasmyth. 1999. Genes Dev. 13:307–319). Pds5p binds to centromeric and arm sequences bound by Mcd1p. Furthermore, Pds5p localization to chromosomes is dependent on Mcd1p. Thus, Pds5p, like the cohesin complex members, is a component of the molecular glue that mediates sister chromatid cohesion. However, Mcd1p localization to chromosomes is independent of Pds5p, which may reflect differences in their roles in cohesion. Finally, Pds5p is required for condensation as well as cohesion, which confirms the link between these processes revealed through analysis of Mcd1p (Guacci, V., D. Koshland, and A. Strunnikov. 1997. Cell. 91:47–57). Therefore, the link between cohesion and condensation is a general property of yeast chromosomes.

Key Words: mitosis, chromosomes, cohesion, condensation, yeast


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