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Tripartite motif (TRIM) protein TRIM5 of the primate species restricts replication of HIV and other retroviruses. Whereas primates have a single TRIM5 gene, the corresponding locus in the mouse has expanded during evolution, now containing more than eight related genes. Owing to the complexity of the genomic organization, a mouse homolog of TRIM5 has not been fully studied thus far. In the present study, we report that Trim12c (formerly Trim12-2) encodes a TRIM5-like protein with a ubiquitin ligase activity. Similar to the primate TRIM5, TRIM12c is expressed in the cytoplasm as a punctate structure and induced upon IFN and pathogen stimulation in macrophages and dendritic cells. We show that TRIM12c interacts with TRAF6, a key protein in the pathogen recognition receptor signaling, and reciprocally enhances their ubiquitination, leading to cooperative activation of IFN and NF-κB pathways. This study identifies TRIM12c as a mouse TRIM5 equivalent, critical for host innate immunity.

the journal of immunology/the journal of immunology

Tripartite Motif (TRIM) 12c, a Mouse Homolog of TRIM5, Is a Ubiquitin Ligase That Stimulates Type I IFN and NF-κB Pathways along with TNFR-Associated Factor 6