The function of ENSG00000167378 (IRGQ, immunity related GTPase Q) is as follows. Autophagy receptor that specifically promotes clearance of misfolded MHC class I molecules by targeting them to the lysosome for degradation (PubMed:39481378). Acts as a molecular adapter that specifically recognizes and binds (1) misfolded MHC class I molecules following their ubiquitination, as well as (2) autophagy-related proteins, promoting the recruitment of misfolded MHC class I molecules to autophagy machinery for degradation (PubMed:39481378). Degradation of misfolded MHC class I molecules is essential to prevent accumulation of defective MHC class I complexes at the surface of CD8(+) T-cells and prevent a stronger T-cell-mediated response (PubMed:39481378). In contrast to other members of the family, does not show GTPase activity (PubMed:39481378). .