4ae4

The UBAP1 subunit of ESCRT-I interacts with ubiquitin via a novel SOUBA domain

spinqualitylabelsall models 4ae4, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ae4 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.65Å Ligands: GOL, K, MSE, MSO, NA, NHE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function UBAP1_HUMAN Publication Abstract from PubMed The endosomal sorting complexes required for transport (ESCRTs) facilitate endosomal sorting of ubiquitinated cargo, MVB biogenesis, late stages of cytokinesis, and retroviral budding. Here we show that ubiquitin associated protein 1 (UBAP1), a subunit of human ESCRT-I, coassembles in a stable 1:1:1:1 complex with Vps23/TSG101, VPS28, and VPS37. The X-ray crystal structure of the C-terminal region of UBAP1 reveals a domain that we describe as a solenoid of overlapping UBAs (SOUBA). NMR analysis shows that each of the three rigidly arranged overlapping UBAs making up the SOUBA interact with ubiquitin. We demonstrate that UBAP1-containing ESCRT-I is essential for degradation of antiviral cell-surface proteins, such as tetherin (BST-2/CD317), by viral countermeasures, namely, the HIV-1 accessory protein Vpu and the Kaposi sarcoma-associated herpesvirus (KSHV) ubiquitin ligase K5. The UBAP1 Subunit of ESCRT-I Interacts with Ubiquitin via a SOUBA Domain.,Agromayor M, Soler N, Caballe A, Kueck T, Freund SM, Allen MD, Bycroft M, Perisic O, Ye Y, McDonald B, Scheel H, Hofmann K, Neil SJ, Martin-Serrano J, Williams RL Structure. 2012 Mar 7;20(3):414-28. PMID:22405001 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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