MCL, Mincle and Dectin‐2 are C‐type lectin receptors expressed by subsets of myeloid cells, and their genes cluster together in the APLEC/Dectin‐2 gene complex. We have previously shown that MCL and Mincle form a heterodimer in the rat, and others have shown that MCL and Dectin‐2 form a heterodimer in the mouse. In the rat, Dectin‐2 is a pseudogene, but here, we examine the association of the three receptors in human. In co‐transfection experiments analyzed with flow cytometry and immunoprecipitation, we here show that human MCL and Mincle form a disulphide‐linked heterodimer that associates with the signalling adaptor molecule FcεRIγ, in accordance with our previous findings in the rat. In contrast to previous findings in the rat, data in this paper indicate a direct association of MCL with FcεRIγ, as previously shown for mouse MCL. We were unable to demonstrate the formation of a heterodimer between human MCL and Dectin‐2. Thus, despite similarities, there may be important differences in the conformation of these receptors between rat, mouse and human, and this may have functional consequences.
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