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CD1a and MHC class I follow a similar endocytic recycling pathway

Barral, D. C. and Cavallari, M. and McCormick, P. J. and Garg, S. and Magee, A. I. and Bonifacino, J. S. and De Libero, G. and Brenner, M. B.. (2008) CD1a and MHC class I follow a similar endocytic recycling pathway. Traffic, Vol. 9. pp. 1446-1457.

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Official URL: http://edoc.unibas.ch/dok/A6004252

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Abstract

CD1 proteins are a family of major histocompatibility complex (MHC) class I-like antigen-presenting molecules that present lipids to T cells. The cytoplasmic tails (CTs) of all human CD1 isoforms, with the exception of CD1a, contain tyrosine-based sorting motifs, responsible for the internalization of proteins by the clathrin-mediated pathway. The role of the CD1a CT, which does not possess any sorting motifs, as well as its mode of internalization are not known. We investigated the internalization and recycling pathways followed by CD1a and the role of its CT. We found that CD1a can be internalized by a clathrin- and dynamin-independent pathway and that it follows a Rab22a- and ADP ribosylation factor (ARF)6-dependent recycling pathway, similar to other cargo internalized independent of clathrin. We also found that the CD1a CT is S-acylated. However, this posttranslational modification does not determine the rate of internalization or recycling of the protein or its localization to detergent-resistant membrane microdomains (DRMs) where we found CD1a to be enriched. We also show that plasma membrane DRMs are essential for efficient CD1a-mediated antigen presentation. These findings place CD1a closer to MHC class I in its trafficking and potential antigen-loading compartments among CD1 isoforms. Furthermore, we identify CD1a as a new marker for the clathrin- and dynamin-independent and DRM-dependent pathway of internalization as well as the Rab22a- and ARF6-dependent recycling pathway.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Experimental Immunology (De Libero)
UniBasel Contributors:De Libero, Gennaro
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Blackwell
ISSN:1398-9219
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2012 16:22
Deposited On:08 Nov 2012 16:09

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