Chromokinesin Kid and kinetochore kinesin CENP-E differentially support chromosome congression without end-on attachment to microtubules

Nat Commun. 2015 Mar 6:6:6447. doi: 10.1038/ncomms7447.

Abstract

Chromosome congression is the alignment of chromosomes at the spindle equator, and is a prerequisite for faithful chromosome segregation. Recent data suggest that before kinetochores attach to the end of microtubules (end-on attachment), chromosomes can move along microtubules towards the spindle equator through attachment of kinetochores to the lateral surface of microtubules (lateral attachment). Here we address this mechanism, focusing on the contribution of two mitotic motors, Kid and CENP-E. In cells depleted of Hec1, which is essential for end-on attachment, chromosomes show partial and transient congression. This transient congression is further perturbed by co-depletion of Kid, suggesting its role in chromosome congression. In comparison, CENP-E suppresses chromosome congression, probably by tethering kinetochores to short, unstable microtubules, and works in congression only when microtubules are stabilized. Our results may reflect the differential contributions of Kid and CENP-E in chromosome congression in physiological conditions where stabilized microtubules are becoming increased.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Blotting, Western
  • Chromosomal Proteins, Non-Histone / metabolism*
  • Chromosome Pairing / physiology*
  • DNA-Binding Proteins / metabolism*
  • Fluorescent Antibody Technique
  • HeLa Cells
  • Humans
  • Kinesins / metabolism*
  • Kinetochores / physiology
  • Mice
  • Microtubules / metabolism*
  • Molecular Motor Proteins / metabolism*
  • Oligonucleotides / genetics
  • Plasmids / genetics
  • RNA Interference
  • Statistics, Nonparametric

Substances

  • Chromosomal Proteins, Non-Histone
  • DNA-Binding Proteins
  • KIF22 protein, human
  • Molecular Motor Proteins
  • Oligonucleotides
  • centromere protein E
  • Kinesins