JCB logo
Accuri Cytometers
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published 24 June 2002. doi:10.1083/jcb.200111052
This Article
Right arrow Full Text
Right arrow Full Text (PDF, 558K)
Right arrow PPT slides of all figures
Right arrow Alert me when this article is cited
Right arrow Citation Map
Services
Right arrow Email this article
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new content in the JCB
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Mollinari, C.
Right arrow Articles by Margolis, R. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Mollinari, C.
Right arrow Articles by Margolis, R. L.
Right arrowPubmed/NCBI databases
*Gene*GEO Profiles
*HomoloGene*Protein
*UniGene
*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*TAXOL
Related Collections
Right arrowRelated Article
Social Bookmarking
 Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati  
What's this?

© The Rockefeller University Press, 0021-9525/2002/6/1175 $5.00
The Journal of Cell Biology, Volume 157, Number 7, June 24, 2002 1175-1186


Article

PRC1 is a microtubule binding and bundling protein essential to maintain the mitotic spindle midzone



Cristiana Mollinari1, Jean-Philippe Kleman1, Wei Jiang2, Guy Schoehn3, Tony Hunter4 and Robert L. Margolis1

1 Institut de Biologie Structurale J-P Ebel (CEA-CNRS), 38027 Grenoble cedex 1, France
2 Department of Biochemistry, New York University Medical Center, New York, NY 10016
3 EMBL Grenoble Outstation, 38042 Grenoble cedex, France
4 The Salk Institute, La Jolla, CA 92037

Address correspondence to Robert L. Margolis, Institut de Biologie Structurale J-P Ebel (CEA-CNRS), 41 rue Jules Horowitz, 38027 Grenoble cedex 1, France. Tel.: 33-43-878-9616. Fax: 33-43-878-5494. E-mail: margolis{at}ibs.fr

Midzone microtubules of mammalian cells play an essential role in the induction of cell cleavage, serving as a platform for a number of proteins that play a part in cytokinesis. We demonstrate that PRC1, a mitotic spindle-associated Cdk substrate that is essential to cell cleavage, is a microtubule binding and bundling protein both in vivo and in vitro. Overexpression of PRC1 extensively bundles interphase microtubules, but does not affect early mitotic spindle organization. PRC1 contains two Cdk phosphorylation motifs, and phosphorylation is possibly important to mitotic suppression of bundling, as a Cdk phosphorylation-null mutant causes extensive bundling of the prometaphase spindle. Complete suppression of PRC1 by siRNA causes failure of microtubule interdigitation between half spindles and the absence of a spindle midzone. Truncation mutants demonstrate that the NH2-terminal region of PRC1, rich in {alpha}-helical sequence, is important for localization to the cleavage furrow and to the center of the midbody, whereas the central region, with the highest sequence homology between species, is required for microtubule binding and bundling activity. We conclude that PRC1 is a microtubule-associated protein required to maintain the spindle midzone, and that distinct functions are associated with modular elements of the primary sequence.

Key Words: mitosis; Cdk; cytokinesis; microtubule-associated protein; cytoskeleton


Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?

Related Article

Bundle up for cytokinesis
Nicole LeBrasseur
J. Cell Biol. 2002 157: 1100. [Full Text] [PDF]



This article has been cited by other articles:



  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents