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The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement

In kinetochores, the Ndc80 complex couples the energy in a depolymerizing microtubule to perform the work of moving chromosomes. The complex directly binds microtubules using an unstructured, positively charged N-terminal tail located on Hec1/Ndc80. Hec1/Ndc80 also contains a calponin homology domai...

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Autores principales: Tooley, John G., Miller, Stephanie A., Stukenberg, P. Todd
Formato: Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078066/
https://www.ncbi.nlm.nih.gov/pubmed/21325630
http://dx.doi.org/10.1091/mbc.E10-07-0626
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author Tooley, John G.
Miller, Stephanie A.
Stukenberg, P. Todd
author_facet Tooley, John G.
Miller, Stephanie A.
Stukenberg, P. Todd
author_sort Tooley, John G.
collection PubMed
description In kinetochores, the Ndc80 complex couples the energy in a depolymerizing microtubule to perform the work of moving chromosomes. The complex directly binds microtubules using an unstructured, positively charged N-terminal tail located on Hec1/Ndc80. Hec1/Ndc80 also contains a calponin homology domain (CHD) that increases its affinity for microtubules in vitro, yet whether it is required in cells and how the tail and CHD work together are critical unanswered questions. Human kinetochores containing Hec1/Ndc80 with point mutations in the CHD fail to align chromosomes or form productive microtubule attachments. Kinetochore architecture and spindle checkpoint protein recruitment are unaffected in these mutants, and the loss of CHD function cannot be rescued by removing Aurora B sites from the tail. The interaction between the Hec1/Ndc80 CHD and a microtubule is facilitated by positively charged amino acids on two separate regions of the CHD, and both are required for kinetochores to make stable attachments to microtubules. Chromosome congression in cells also requires positive charge on the Hec1 tail to facilitate microtubule contact. In vitro binding data suggest that charge on the tail regulates attachment by directly increasing microtubule affinity as well as driving cooperative binding of the CHD. These data argue that in vertebrates there is a tripartite attachment point facilitating the interaction between Hec1/Ndc80 and microtubules. We discuss how such a complex microtubule-binding interface may facilitate the coupling of depolymerization to chromosome movement.
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spelling pubmed-30780662011-06-30 The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement Tooley, John G. Miller, Stephanie A. Stukenberg, P. Todd Mol Biol Cell Articles In kinetochores, the Ndc80 complex couples the energy in a depolymerizing microtubule to perform the work of moving chromosomes. The complex directly binds microtubules using an unstructured, positively charged N-terminal tail located on Hec1/Ndc80. Hec1/Ndc80 also contains a calponin homology domain (CHD) that increases its affinity for microtubules in vitro, yet whether it is required in cells and how the tail and CHD work together are critical unanswered questions. Human kinetochores containing Hec1/Ndc80 with point mutations in the CHD fail to align chromosomes or form productive microtubule attachments. Kinetochore architecture and spindle checkpoint protein recruitment are unaffected in these mutants, and the loss of CHD function cannot be rescued by removing Aurora B sites from the tail. The interaction between the Hec1/Ndc80 CHD and a microtubule is facilitated by positively charged amino acids on two separate regions of the CHD, and both are required for kinetochores to make stable attachments to microtubules. Chromosome congression in cells also requires positive charge on the Hec1 tail to facilitate microtubule contact. In vitro binding data suggest that charge on the tail regulates attachment by directly increasing microtubule affinity as well as driving cooperative binding of the CHD. These data argue that in vertebrates there is a tripartite attachment point facilitating the interaction between Hec1/Ndc80 and microtubules. We discuss how such a complex microtubule-binding interface may facilitate the coupling of depolymerization to chromosome movement. The American Society for Cell Biology 2011-04-15 /pmc/articles/PMC3078066/ /pubmed/21325630 http://dx.doi.org/10.1091/mbc.E10-07-0626 Text en © 2011 Tooley et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,“ “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology.
spellingShingle Articles
Tooley, John G.
Miller, Stephanie A.
Stukenberg, P. Todd
The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title_full The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title_fullStr The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title_full_unstemmed The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title_short The Ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
title_sort ndc80 complex uses a tripartite attachment point to couple microtubule depolymerization to chromosome movement
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3078066/
https://www.ncbi.nlm.nih.gov/pubmed/21325630
http://dx.doi.org/10.1091/mbc.E10-07-0626
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