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The tripartite motif-containing (TRIM) proteins are involved in a wide range of cellular processes, and the role of TRIM1 in immunity has been explored. However, fundamental studies on fish TRIM1 are lacking. In this study, we cloned and characterized TRIM1 cDNA from the Korean rose bitterling, Rhodeus uyekii (RuTRIM1). Two RuTRIM1 isoforms (RuTRIM1-X1 and RuTRIM1-X2) were identified. The coding sequence (CDS) of RuTRIM1-X1 comprised 2157 bp encoding a 718-aa protein, and the CDS of RuTRIM1-X2 comprised 1929 bp encoding a 642-aa protein. Both RuTRIM1 isoforms contained a RING finger domain, B-box 1, B-box 2, coiled-coil domain, COS box, FN3 motif, and PRY/SPRY domain. The deduced RuTRIM1-X1 and RuTRIM1-X2 proteins had high amino acid identity (76.27-98.89%) with orthologs from various other species, and a phylogenetic tree was constructed. RuTRIM1-X1 and RuTRIM1-X2 mRNA were expressed in all tissues examined, with the highest expression levels detected in the hepatopancreas. During early development, RuTRIM1-X1 and RuTRIM1-X2 mRNA levels changed differently from the gastrula period to the first feeding stage. An in vivo ubiquitination assay showed that RuTRIM1 exhibited RING-dependent E3 ubiquitin ligase activity, mainly by comparing RuTRIM1-X2 to RuTRIM1-X1. The subcellular localization of the two RuTRIM1 protein isoforms was characterized, revealing that they formed aggregates in cytoplasmic bodies in Raw264.7 cells. Interferon-γ/lipopolysaccharide-induced nuclear factor-κB signaling was negatively regulated by RuTRIM1-X1 and RuTRIM1-X2, and the negative effect was reversed in RING deletion mutants. To our knowledge, this is the first study to characterize fish TRIM1, which may play a role in the inflammatory response.
This article was published in the following journal.
Name: Fish & shellfish immunology
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A tripartite motif protein consisting of an N-terminal RING finger, two B-box type ZINC FINGERS, and C-terminal PHD domain. It functions as a transcriptional repressor by associating with Kruppel-association box domain (KRAB domain) transcription factors and has E3-SUMO-ligase activity towards itself and also sumoylates INTERFERON REGULATORY FACTOR-7 to reduce its activity as a transcriptional activator. It can also function as a ubiquitin protein ligase towards TUMOR SUPPRESSOR PROTEIN P53.
A tripartite motif protein that contains three ZINC FINGERS, including a RING FINGER DOMAIN, at its N-terminal. Several nuclear and one cytoplasmic isoforms result from alternative splicing of the PML gene; most nuclear isoforms localize to subnuclear structures (PML nuclear bodies) that are disrupted in ACUTE PROMYELOCYTIC LEUKEMIA cells.
A protein interaction domain that is characterized by a bent "beta-sandwich" consisting of two antiparallel beta-sheets. It occurs in eukaryotic proteins, including many TRIPARTITE MOTIF PROTEINS, which function in a variety of cellular processes.
A protein family defined by the presence of three ZINC FINGER domains, one of which is a RING FINGER DOMAIN, a coiled-coil region, and a highly variable C-terminal region. They function in many cellular processes including APOPTOSIS and CELL CYCLE regulation.
A tripartite motif protein that consists of an N-terminal pyrin domain, a central coiled-coil region and B-box type ZINC FINGER, and C-terminal regions that mediate homotrimerization and interactions with other proteins (the B30.2/SPRY DOMAIN). It is expressed primarily by mature GRANULOCYTES and associates with the cytoskeleton in the perinuclear area as well as AUTOPHAGOSOMES, where it co-ordinates the assembly of AUTOPHAGY-RELATED PROTEINS and degradation of INFLAMMASOME components. It functions in INNATE IMMUNITY and INFLAMMATION; mutations in the Pyrin protein (MEFV) gene are associated with FAMILIAL MEDITERRANEAN FEVER.
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