8fxf
From Proteopedia
Crystal structure of the coiled-coil domain of TRIM56
Structural highlights
FunctionTRI56_MOUSE E3 ubiquitin-protein ligase that plays a key role in innate antiviral immunity by mediating ubiquitination of CGAS and STING1 (PubMed:21074459, PubMed:29426904). In response to pathogen- and host-derived double-stranded DNA (dsDNA), targets STING1 to 'Lys-63'-linked ubiquitination, thereby promoting its homodimerization, a step required for the production of type I interferon IFN-beta (PubMed:21074459). Also mediates monoubiquitination of CGAS, thereby promoting CGAS oligomerization and subsequent activation (PubMed:29426904). Independently of its E3 ubiquitin ligase activity, positive regulator of TLR3 signaling (By similarity). Potentiates extracellular double stranded RNA (dsRNA)-induced expression of IFNB1 and interferon-stimulated genes ISG15, IFIT1/ISG56, CXCL10, OASL and CCL5/RANTES (By similarity).[UniProtKB:Q9BRZ2][1] [2] Publication Abstract from PubMedProtein ubiquitination is a post-translation modification mediated by E3 ubiquitin ligases. The RING domain E3 ligases are the largest family of E3 ubiquitin ligases, they act as a scaffold, bringing the E2-ubiquitin complex and its substrate together to facilitate direct ubiquitin transfer. However, the quaternary structures of RING E3 ligases that perform ubiquitin transfer remain poorly understood. In this study, we solved the crystal structure of TRIM56, a member of the RING E3 ligase. The structure of the coiled-coil domain indicated that the two anti-parallel dimers bound together to form a tetramer at a small crossing angle. This tetramer structure allows two RING domains to exist on each side to form an active homodimer in supporting ubiquitin transfer from E2 to its nearby substrate recruited by the C-terminal domains on the same side. These findings suggest that the coiled-coil domain-mediated tetramer is a feasible scaffold for facilitating the recruitment and transfer of ubiquitin to accomplish E3 ligase activity. TRIM56 coiled-coil domain structure provides insights into its E3 ligase functions.,Lou X, Ma B, Zhuang Y, Xiao X, Minze LJ, Xing J, Zhang Z, Li XC Comput Struct Biotechnol J. 2023 Apr 23;21:2801-2808. doi: , 10.1016/j.csbj.2023.04.022. eCollection 2023. PMID:37168870[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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Categories: Large Structures | Mus musculus | Li XC | Lou XH | Ma BB | Zhuang Y
