3f92

Crystal structure of ubiquitin-conjugating enzyme E2-25kDa (Huntington Interacting Protein 2) M172A mutant crystallized at pH 8.5

spinqualitylabelsall models 3f92, resolution 2.23Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3f92 is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BME, CA, PG4, TRS Related: 3e46, 1yla, 1jbb Activity: E2 ubiquitin-conjugating enzyme, with EC number 2.3.2.23 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [UBE2K_HUMAN] Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro, in the presence or in the absence of BRCA1-BARD1 E3 ubiquitin-protein ligase complex, catalyzes the synthesis of 'Lys-48'-linked polyubiquitin chains. Does not transfer ubiquitin directly to but elongates monoubiquitinated substrate protein. Mediates the selective degradation of short-lived and abnormal proteins, such as the endoplasmic reticulum-associated degradation (ERAD) of misfolded lumenal proteins. Ubiquitinates huntingtin. May mediate foam cell formation by the suppression of apoptosis of lipid-bearing macrophages through ubiquitination and subsequence degradation of p53/TP53. Proposed to be involved in ubiquitination and proteolytic processing of NF-kappa-B; in vitro supports ubiquitination of NFKB1. In case of infection by cytomegaloviruses may be involved in the US11-dependent degradation of MHC class I heavy chains following their export from the ER to the cytosol. In case of viral infections may be involved in the HPV E7 protein-dependent degradation of RB1. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The ubiquitin-conjugating enzyme E2-25K has been identified as a huntingtin (the key protein in Huntington's disease) interacting protein and has been shown to play a role in mediating the toxicity of Abeta, the principal protein involved in Alzheimer's disease pathogenesis. E2-25K is a dual-domain protein with an ubiquitin-associated (UBA) domain as well as a conserved ubiquitin-conjugating (UBC) domain which catalyzes the formation of a covalent bond between the C-terminal glycine of an ubiquitin molecule and the -amine of a lysine residue on the acceptor protein as part of the ubiquitin-proteasome pathway. The crystal structures of E2-25K M172A mutant protein at pH 6.5 and pH 8.5 were determined to 1.9 and 2.2 A resolution, respectively. Examination of the structures revealed domain-domain interactions between the UBC and UBA domains which have not previously been reported. Structure of full-length ubiquitin-conjugating enzyme E2-25K (huntingtin-interacting protein 2).,Wilson RC, Hughes RC, Flatt JW, Meehan EJ, Ng JD, Twigg PD Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 May 1;65(Pt, 5):440-4. Epub 2009 Apr 24. PMID:19407372 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ubiquitin conjugating enzyme

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