7wwq
Crystal structure of human Ufd1-Npl4 complex
Structural highlights
FunctionNPL4_HUMAN The ternary complex containing UFD1, VCP and NPLOC4 binds ubiquitinated proteins and is necessary for the export of misfolded proteins from the ER to the cytoplasm, where they are degraded by the proteasome. The NPLOC4-UFD1-VCP complex regulates spindle disassembly at the end of mitosis and is necessary for the formation of a closed nuclear envelope (By similarity). Acts as a negative regulator of type I interferon production via the complex formed with VCP and UFD1, which binds to RIGI and recruits RNF125 to promote ubiquitination and degradation of RIGI (PubMed:26471729).[UniProtKB:Q9ES54][1] Publication Abstract from PubMedThe heterodimer of human ubiquitin fusion degradation 1 (hUfd1) and human nuclear protein localization 4 (hNpl4) is a major cofactor of human p97 adenosine triphosphatase (ATPase). The p97-Ufd1-Npl4 complex translocates the ubiquitin-conjugated proteins from the endoplasmic reticulum membrane to the cytoplasm. Ubiquitinated proteins are then degraded by the proteasome. The structures of Npl4 and Ufd1-Npl4 (UN) complex in Saccharomyces cerevisiae have been recently reported; however, the structures of hNpl4 and the human UN complex remain unknown. Here, we report the crystal structures of the human UN complex at a resolution of 2.7 A and hNpl4 at a resolution of 3.0 A. We also present atomic details and characterization of the human UN complex. Crystallographic studies and site-directed mutagenesis of the hUfd1 residues involved in the interaction with hNpl4 revealed the atomic details of the two proteins. Structural basis for the interaction between human Npl4 and Npl4-binding motif of human Ufd1.,Nguyen TQ, My Le LT, Kim DH, Ko KS, Lee HT, Kim Nguyen YT, Kim HS, Han BW, Kang W, Yang JK Structure. 2022 Nov 3;30(11):1530-1537.e3. doi: 10.1016/j.str.2022.08.005. Epub , 2022 Sep 9. PMID:36087575[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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