The E3 Ubiquitin Ligase RNF7 Negatively Regulates CARD14/CARMA2sh Signaling.

ABSTRACT: The three CARD-containing MAGUK (CARMA) proteins function as scaffolding molecules that regulate activation of the pro-inflammatory transcription factor NF-?B. Recently, mutations in CARMA2 have been linked to psoriasis susceptibility due to their acquired altered capacity to activate NF-?B. By means of two-hybrid screening with yeast, we identified RING finger protein 7 (RNF7) as an interactor of CARMA2. We present evidence that RNF7 functions as a negative regulator of the NF-?B-activating capacity of CARMA2. Mechanistically, RNF7 influences CARMA2 signaling by regulating the ubiquitination state of MALT1 and the NF-?B-regulatory molecule NEMO. Interestingly, CARMA2short (CARMA2sh) mutants associated with psoriasis susceptibility escape the negative control exerted by RNF7. In conclusion, our findings identify a new mechanism through which the ability of CARMA2 to activate NF-?B is regulated, which could have significant implications for our understanding of why mutations of this protein trigger human psoriasis.

SUBMITTER: Telesio G 

PROVIDER: S-EPMC5751184 | biostudies-other | 2017 Dec

REPOSITORIES: biostudies-other