DSpace

Digital.CSIC > Biología y Biomedicina > Centro de Biología Molecular Severo Ochoa (CBM) > (CBM) Artículos >

Share

EndNote

Impact

Closed Access item MAL Protein Controls Protein Sorting at the Supramolecular Activation Cluster of Human T Lymphocytes

Authors:Antón, Olga M.
Andrés-Delgado, Laura
Reglero-Real, Natalia
Batista, Alicia
Alonso, Miguel A.
Keywords:Immunological synapse, T cell membrane receptors, Supramolecular activation cluster, Jurkat T cell
Issue Date:25-May-2011
Publisher:American Association of Immunologists
Citation:Journal of Immunology 186 (11): 6345-6356 (2011)
Abstract:T cell membrane receptors and signaling molecules assemble at the immunological synapse (IS) in a supramolecular activation cluster (SMAC), organized into two differentiated subdomains: the central SMAC (cSMAC), with the TCR, Lck, and linker for activation of T cells (LAT), and the peripheral SMAC (pSMAC), with adhesion molecules. The mechanism of protein sorting to the SMAC subdomains is still unknown. MAL forms part of the machinery for protein targeting to the plasma membrane by specialized mechanisms involving condensed membranes or rafts. In this article, we report our investigation of the dynamics of MAL during the formation of the IS and its role in SMAC assembly in the Jurkat T cell line and human primary T cells. We observed that under normal conditions, a pool of MAL rapidly accumulates at the cSMAC, where it colocalized with condensed membranes, as visualized with the membrane fluorescent probe Laurdan. Mislocalization of MAL to the pSMAC greatly reduced membrane condensation at the cSMAC and redistributed machinery involved in docking microtubules or transport vesicles from the cSMAC to the pSMAC. As a consequence of these alterations, the raft-associated molecules Lck and LAT, but not the TCR, were missorted to the pSMAC. MAL, therefore, regulates membrane order and the distribution of microtubule and transport vesicle docking machinery at the IS and, by doing so, ensures correct protein sorting of Lck and LAT to the cSMAC.
Publisher version (URL):http://dx.doi.org/10.4049/jimmunol.1003771
URI:http://hdl.handle.net/10261/57645
ISSN:0022-1767
E-ISSNmetadata.dc.identifier.doi = DOI:1550-660
Appears in Collections:(CBM) Artículos

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.