Mitotic control of kinetochore-associated dynein and spindle orientation by human Spindly.
Mitotic spindle formation and chromosome segregation depend critically on kinetochore-microtubule (KT-MT) interactions. A new protein, termed Spindly in Drosophila and SPDL-1 in C. elegans, was recently shown to regulate KT localization of dynein, but depletion phenotypes revealed striking differences, suggesting evolutionarily diverse roles of mitotic dynein. By characterizing the function of Spindly in human cells, we identify specific functions for KT dynein. We show that localization of human Spindly (hSpindly) to KTs is controlled by the Rod/Zw10/Zwilch (RZZ) complex and Aurora B. hSpindly depletion results in reduced inter-KT tension, unstable KT fibers, an extensive prometaphase delay, and severe chromosome misalignment. Moreover, depletion of hSpindly induces a striking spindle rotation, which can be rescued by co-depletion of dynein. However, in contrast to Drosophila, hSpindly depletion does not abolish the removal of MAD2 and ZW10 from KTs. Collectively, our data reveal hSpindly-mediated dynein functions and highlight a critical role of KT dynein in spindle orientation.
Chan
Ying Wai
YW
Department of Cell Biology, Max Planck Institute of Biochemistry, D-82152 Martinsried, Germany.
Fava
Luca L
LL
Uldschmid
Andreas
A
Schmitz
Michael H A
MH
Gerlich
Daniel W
DW
Nigg
Erich A
EA
Santamaria
Anna
A
D064107:Aurora Kinase B; D064127:Aurora Kinases; D002877:Chromosomes, Human / Q000378:metabolism / Q000648:ultrastructure; D003598:Cytoskeletal Proteins; D000072159:Dynactin Complex; D004398:Dyneins / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D018386:Kinetochores / Q000378:metabolism*; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D008938:Mitosis; D009687:Nuclear Proteins / Q000378:metabolism; D017239:Paclitaxel / Q000494:pharmacology; D017346:Protein Serine-Threonine Kinases / Q000502:physiology; D015398:Signal Transduction; D008941:Spindle Apparatus / Q000378:metabolism* / Q000648:ultrastructure
D003598:Cytoskeletal Proteins; D000072159:Dynactin Complex; D008869:Microtubule-Associated Proteins; C120529:NDC80 protein, human; D009687:Nuclear Proteins; C576921:AURKB protein, human; D064107:Aurora Kinase B; D064127:Aurora Kinases; D017346:Protein Serine-Threonine Kinases; D004398:Dyneins; D017239:Paclitaxel