PMID- 32719056 OWN - NLM STAT- MEDLINE DCOM- 20210618 LR - 20210618 IS - 1477-9137 (Electronic) IS - 0021-9533 (Linking) VI - 133 IP - 14 DP - 2020 Jul 21 TI - The ubiquitin-like modifier FAT10 - much more than a proteasome-targeting signal. LID - jcs246041 [pii] LID - 10.1242/jcs.246041 [doi] AB - Human leukocyte antigen (HLA)-F adjacent transcript 10 (FAT10) also called ubiquitin D (UBD) is a member of the ubiquitin-like modifier (ULM) family. The FAT10 gene is localized in the MHC class I locus and FAT10 protein expression is mainly restricted to cells and organs of the immune system. In all other cell types and tissues, FAT10 expression is highly inducible by the pro-inflammatory cytokines interferon (IFN)-gamma and tumor necrosis factor (TNF). Besides ubiquitin, FAT10 is the only ULM which directly targets its substrates for degradation by the 26S proteasome. This poses the question as to why two ULMs sharing the proteasome-targeting function have evolved and how they differ from each other. This Review summarizes the current knowledge of the special structure of FAT10 and highlights its differences from ubiquitin. We discuss how these differences might result in differential outcomes concerning proteasomal degradation mechanisms and non-covalent target interactions. Moreover, recent insights about the structural and functional impact of FAT10 interacting with specific non-covalent interaction partners are reviewed. CI - (c) 2020. Published by The Company of Biologists Ltd. FAU - Aichem, Annette AU - Aichem A AD - Biotechnology Institute Thurgau at the University of Konstanz, CH-8280 Kreuzlingen, Switzerland. AD - Division of Immunology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany. FAU - Groettrup, Marcus AU - Groettrup M AUID- ORCID: 0000-0002-5423-6399 AD - Biotechnology Institute Thurgau at the University of Konstanz, CH-8280 Kreuzlingen, Switzerland Marcus.Groettrup@uni-konstanz.de. AD - Division of Immunology, Department of Biology, University of Konstanz, D-78457 Konstanz, Germany. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20200721 PL - England TA - J Cell Sci JT - Journal of cell science JID - 0052457 RN - 0 (Tumor Necrosis Factor-alpha) RN - 0 (Ubiquitin) RN - 0 (Ubiquitins) RN - EC 3.4.25.1 (Proteasome Endopeptidase Complex) SB - IM MH - Humans MH - *Proteasome Endopeptidase Complex/genetics MH - Tumor Necrosis Factor-alpha MH - *Ubiquitin MH - Ubiquitins/genetics OTO - NOTNLM OT - Autophagy OT - FAT10 OT - Proteasome OT - Proteostasis OT - Ubiquitin OT - Ubiquitin-like modifier OT - VCP COIS- Competing interestsThe authors declare no competing or financial interests. EDAT- 2020/07/29 06:00 MHDA- 2021/06/22 06:00 CRDT- 2020/07/29 06:00 PHST- 2020/07/29 06:00 [entrez] PHST- 2020/07/29 06:00 [pubmed] PHST- 2021/06/22 06:00 [medline] AID - 133/14/jcs246041 [pii] AID - 10.1242/jcs.246041 [doi] PST - epublish SO - J Cell Sci. 2020 Jul 21;133(14):jcs246041. doi: 10.1242/jcs.246041.