Kinesin-8 effects on mitotic microtubule dynamics contribute to spindle function in fission yeast.

Abstract:

:Kinesin-8 motor proteins destabilize microtubules. Their absence during cell division is associated with disorganized mitotic chromosome movements and chromosome loss. Despite recent work studying effects of kinesin-8s on microtubule dynamics, it remains unclear whether the kinesin-8 mitotic phenotypes are consequences of their effect on microtubule dynamics, their well-established motor activity, or additional, unknown functions. To better understand the role of kinesin-8 proteins in mitosis, we studied the effects of deletion of the fission yeast kinesin-8 proteins Klp5 and Klp6 on chromosome movements and spindle length dynamics. Aberrant microtubule-driven kinetochore pushing movements and tripolar mitotic spindles occurred in cells lacking Klp5 but not Klp6. Kinesin-8-deletion strains showed large fluctuations in metaphase spindle length, suggesting a disruption of spindle length stabilization. Comparison of our results from light microscopy with a mathematical model suggests that kinesin-8-induced effects on microtubule dynamics, kinetochore attachment stability, and sliding force in the spindle can explain the aberrant chromosome movements and spindle length fluctuations seen.

journal_name

Mol Biol Cell

authors

Gergely ZR,Crapo A,Hough LE,McIntosh JR,Betterton MD

doi

10.1091/mbc.E15-07-0505

subject

Has Abstract

pub_date

2016-11-07 00:00:00

pages

3490-3514

issue

22

eissn

1059-1524

issn

1939-4586

pii

mbc.E15-07-0505

journal_volume

27

pub_type

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