Coordinated spindle assembly and orientation requires Clb5p-dependent kinase in budding yeast. Export

@article{citeulike:3024737, abstract = {The orientation of the mitotic spindle along a polarity axis is critical in asymmetric cell divisions. In the budding yeast, Saccharomyces cerevisiae, loss of the S-phase B-type cyclin Clb5p under conditions of limited cyclin-dependent kinase activity (cdc28-4 clb5Delta cells) causes a spindle positioning defect that results in an undivided nucleus entering the bud. Based on time-lapse digital imaging microscopy of microtubules labeled with green fluorescent protein fusions to either tubulin or dynein, we observed that the asymmetric behavior of the spindle pole bodies during spindle assembly was lost in the cdc28-4 clb5Delta cells. As soon as a spindle formed, both poles were equally likely to interact with the bud cell cortex. Persistent dynamic interactions with the bud ultimately led to spindle translocation across the bud neck. Thus, the mutant failed to assign one spindle pole body the task of organizing astral microtubules towards the mother cell. Our data suggest that Clb5p-associated kinase is required to confer mother-bound behavior to one pole in order to establish correct spindle polarity. In contrast, B-type cyclins, Clb3p and Clb4p, though partially redundant with Clb5p for an early role in spindle morphogenesis, preferentially promote spindle assembly.}, address = {Department of Molecular Biology, MB7, The Scripps Research Institute, La Jolla, California 92037, USA.}, author = {Segal, M. and Clarke, D. J. and Maddox, P. and Salmon, E. D. and Bloom, K. and Reed, S. I.}, citeulike-article-id = {3024737}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/10662771}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=10662771}, day = {7}, issn = {0021-9525}, journal = {The Journal of cell biology}, keywords = {cell, cycle, scerevisiae, spb}, month = {February}, number = {3}, pages = {441--452}, posted-at = {2008-07-21 16:40:43}, priority = {2}, title = {Coordinated spindle assembly and orientation requires Clb5p-dependent kinase in budding yeast.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/10662771}, volume = {148}, year = {2000} }

TY - JOUR ID - citeulike:3024737 L3 - citeulike-article-id:3024737 N2 - The orientation of the mitotic spindle along a polarity axis is critical in asymmetric cell divisions. In the budding yeast, Saccharomyces cerevisiae, loss of the S-phase B-type cyclin Clb5p under conditions of limited cyclin-dependent kinase activity (cdc28-4 clb5Delta cells) causes a spindle positioning defect that results in an undivided nucleus entering the bud. Based on time-lapse digital imaging microscopy of microtubules labeled with green fluorescent protein fusions to either tubulin or dynein, we observed that the asymmetric behavior of the spindle pole bodies during spindle assembly was lost in the cdc28-4 clb5Delta cells. As soon as a spindle formed, both poles were equally likely to interact with the bud cell cortex. Persistent dynamic interactions with the bud ultimately led to spindle translocation across the bud neck. Thus, the mutant failed to assign one spindle pole body the task of organizing astral microtubules towards the mother cell. Our data suggest that Clb5p-associated kinase is required to confer mother-bound behavior to one pole in order to establish correct spindle polarity. In contrast, B-type cyclins, Clb3p and Clb4p, though partially redundant with Clb5p for an early role in spindle morphogenesis, preferentially promote spindle assembly. IS - 3 JF - The Journal of cell biology SN - 0021-9525 AD - Department of Molecular Biology, MB7, The Scripps Research Institute, La Jolla, California 92037, USA. EP - 452 TI - Coordinated spindle assembly and orientation requires Clb5p-dependent kinase in budding yeast. VL - 148 SP - 441 KW - cell KW - cycle KW - scerevisiae KW - spb AU - Segal, M AU - Clarke, DJ AU - Maddox, P AU - Salmon, ED AU - Bloom, K AU - Reed, SI PY - 2000/02/07/ UR - http://view.ncbi.nlm.nih.gov/pubmed/10662771 ER -