Abstract |
DNGR-1 is receptor expressed by certain dendritic cell (DC) subsets and by DC precursors in mouse. It possesses a C-type lectin-like domain (CTLD) followed by a poorly characterized neck region coupled to a transmembrane region and short intracellular tail. The CTLD of DNGR-1 binds F-actin exposed by dead cell corpses and causes the receptor to signal and potentiate cross-presentation of dead cell-associated antigens by DCs. Here, we describe a conformational change that occurs in the neck region of DNGR-1 in a pH- and ionic strength-dependent manner and that controls cross-presentation of dead cell-associated antigens. We identify residues in the neck region that, when mutated, lock DNGR-1 in one of the two conformational states to potentiate cross-presentation. In contrast, we show that chimeric proteins in which the neck region of DNGR-1 is replaced by that of unrelated C-type lectin receptors fail to promote cross-presentation. Our results suggest that the neck region of DNGR-1 is an integral receptor component that senses receptor progression through the endocytic pathway and has evolved to maximize extraction of antigens from cell corpses, coupling DNGR-1 function to its cellular localization.
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Authors | Pavel Hanč, Oliver Schulz, Hanna Fischbach, Stephen R Martin, Svend Kjær, Caetano Reis e Sousa |
Journal | The EMBO journal
(EMBO J)
Vol. 35
Issue 22
Pg. 2484-2497
(11 15 2016)
ISSN: 1460-2075 [Electronic] England |
PMID | 27753620
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | © 2016 The Authors. Published under the terms of the CC BY 4.0 license. |
Chemical References |
- Clec9a protein, mouse
- Lectins, C-Type
- Receptors, Immunologic
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Topics |
- Allosteric Regulation
- Animals
- DNA Mutational Analysis
- Dendritic Cells
(metabolism)
- Hydrogen-Ion Concentration
- Lectins, C-Type
(chemistry, genetics, metabolism)
- Mice
- Osmolar Concentration
- Protein Conformation
(drug effects)
- Receptors, Immunologic
(chemistry, genetics, metabolism)
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