JCB logo
Sign up for e-mail content alerts
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

This Article
Right arrow Full Text (PDF, 3733K)
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 Felix, M. A.
Right arrow Articles by Maro, B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Felix, M. A.
Right arrow Articles by Maro, B.
Right arrowPubmed/NCBI databases
*Compound via MeSH
*Substance via MeSH
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 Journal of Cell Biology, Vol 124, 19-31, Copyright © 1994 by The Rockefeller University Press


ARTICLES

Centrosome assembly in vitro: role of gamma-tubulin recruitment in Xenopus sperm aster formation

MA Felix, C Antony, M Wright and B Maro
Departement de Biologie du Developpement, Institut J. Monod, Centre National de la Recherche Scientifique-Paris 7, France.

Centrioles organize microtubules in two ways: either microtubules elongate from the centriole cylinder itself, forming a flagellum or a cilium ("template elongation"), or pericentriolar material assembles and nucleates a microtubule aster ("astral nucleation"). During spermatogenesis in most species, a motile flagellum elongates from one of the sperm centrioles, whereas after fertilization a large aster of microtubules forms around the sperm centrioles in the egg cytoplasm. Using Xenopus egg extracts we have developed an in vitro system to study this change in microtubule-organizing activity. An aster of microtubules forms around the centrioles of permeabilized frog sperm in egg extracts, but not in pure tubulin. However, when the sperm heads are incubated in the egg extract in the presence of nocodazole, they are able to nucleate a microtubule aster after isolation and incubation with pure calf brain tubulin. This provides a two-step assay that distinguishes between centrosome assembly and subsequent microtubule nucleation. We have studied several centrosomal antigens during centrosome assembly. The CTR2611 antigen is present in the sperm head in the peri-centriolar region. gamma-tubulin and certain phosphorylated epitopes appear in the centrosome only after incubation in the egg extract. gamma-tubulin is recruited from the egg extract and associated with electron-dense patches dispersed in a wide area around the centrioles. Immunodepletion of gamma-tubulin and associated molecules from the egg extract before sperm head incubation prevents the change in microtubule-organizing activity of the sperm heads. This suggests that gamma-tubulin and/or associated molecules play a key role in centrosome formation and activity.
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?


This article has been cited by other articles:



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