JCB logo
R&D Systems
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published 4 August 2003. doi:10.1083/jcb.200302131
This Article
Right arrow Full Text
Right arrow PDF (Full Text)
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 Bache, K. G.
Right arrow Articles by Stenmark, H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bache, K. G.
Right arrow Articles by Stenmark, H.
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, 0021-9525/2003/8/435 $5.00
The Journal of Cell Biology, Volume 162, Number 3, 435-442


Article

Hrs regulates multivesicular body formation via ESCRT recruitment to endosomes

Kristi G. Bache, Andreas Brech, Anja Mehlum and Harald Stenmark

Department of Biochemistry, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway

Address correspondence to Harald Stenmark, Dept. of Biochemistry, The Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway. Tel.: 47-22934951. Fax: 47-22508692. email: stenmark{at}ulrik.uio.no

Hrs and the endosomal sorting complexes required for transport, ESCRT-I, -II, and -III, are involved in the endosomal sorting of membrane proteins into multivesicular bodies and lysosomes or vacuoles. The ESCRT complexes are also required for formation of intraluminal endosomal vesicles and for budding of certain enveloped RNA viruses such as HIV. Here, we show that Hrs binds to the ESCRT-I subunit Tsg101 via a PSAP motif that is conserved in Tsg101-binding viral proteins. Depletion of Hrs causes a reduction in membrane-associated ESCRT-I subunits, a decreased number of multivesicular bodies and an increased size of late endosomes. Even though Hrs mainly localizes to early endosomes and Tsg101 to late endosomes, the two proteins colocalize on a subpopulation of endosomes that contain lyso-bisphosphatidic acid. Overexpression of Hrs causes accumulation of Tsg101 on early endosomes and prevents its localization to late endosomes. We conclude that Hrs mediates the initial recruitment of ESCRT-I to endosomes and, thereby, indirectly regulates multivesicular body formation.

Key Words: endocytosis; lysosome; membrane traffic; Tsg101; protein sorting


Abbreviations used in this paper: ESCRT, endosomal sorting complex required for transport; LBPA, lyso-bisphosphatidic acid; MVB, multivesicular body; siRNA, small interfering RNA; UIM, ubiquitin-interacting motif; Vps, vacuolar protein sorting.


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