Publication — IRIC

The nucleotide-binding domain of NLRC5 is critical for nuclear import and transactivation activity.

Major histocompatibility complex (MHC) class I and class II are crucial for the function of the human adaptive immune system. A member of the NLR (nucleotide-binding domain, leucine-rich repeat) protein family, NLRC5, has recently been identified as a transcriptional regulator of MHC class I and related genes. While a ‘master regulator’ of MHC class II genes, CIITA, has long been known, NLRC5 specifically associates with and transactivates the proximal promoters of MHC class I genes. In this study, we analyzed the molecular requirements of NLRC5 nuclear import and transactivation activity. We show that NLRC5-mediated MHC class I gene induction requires an intact nuclear localization signal and nuclear distribution of NLRC5. In addition, we find that the nucleotide-binding domain (NBD) of NLRC5 is critical not only for nuclear translocation but also for the transactivation of MHC class I genes. Changing the cellular localization of NLRC5 is likely to immediately impact MHC class I expression as well as MHC class I-mediated antigen presentation. NLRC5 may thus provide a promising target for the modulation of MHC class I antigen presentation, especially in the setting of transplant medicine.

Date de publication
24 février 2012
Meissner TB, Li A, Liu YJ, Gagnon E, Kobayashi KS
Référence PubMed
Biochem. Biophys. Res. Commun. 2012;418(4):786-91
ID PubMed
Department of Cancer Immunology & AIDS, Dana-Farber Cancer Institute, Boston, MA 02215, United States.