9mux

Structural highlights

Disease

UBR1_HUMAN Johanson-Blizzard syndrome. The disease is caused by mutations affecting the gene represented in this entry.

Function

UBR1_HUMAN E3 ubiquitin-protein ligase which is a component of the N-end rule pathway. Recognizes and binds to proteins bearing specific N-terminal residues that are destabilizing according to the N-end rule, leading to their ubiquitination and subsequent degradation. May be involved in pancreatic homeostasis. Binds leucine and is a negative regulator of the leucine-mTOR signaling pathway, thereby controlling cell growth.^{[1] [2] [3] [4]}

References

1. ↑ Kwak KS, Zhou X, Solomon V, Baracos VE, Davis J, Bannon AW, Boyle WJ, Lacey DL, Han HQ. Regulation of protein catabolism by muscle-specific and cytokine-inducible ubiquitin ligase E3alpha-II during cancer cachexia. Cancer Res. 2004 Nov 15;64(22):8193-8. PMID:15548684 doi:http://dx.doi.org/64/22/8193
2. ↑ Zenker M, Mayerle J, Lerch MM, Tagariello A, Zerres K, Durie PR, Beier M, Hulskamp G, Guzman C, Rehder H, Beemer FA, Hamel B, Vanlieferinghen P, Gershoni-Baruch R, Vieira MW, Dumic M, Auslender R, Gil-da-Silva-Lopes VL, Steinlicht S, Rauh M, Shalev SA, Thiel C, Ekici AB, Winterpacht A, Kwon YT, Varshavsky A, Reis A. Deficiency of UBR1, a ubiquitin ligase of the N-end rule pathway, causes pancreatic dysfunction, malformations and mental retardation (Johanson-Blizzard syndrome). Nat Genet. 2005 Dec;37(12):1345-50. Epub 2005 Nov 20. PMID:16311597 doi:http://dx.doi.org/10.1038/ng1681
3. ↑ Kume K, Iizumi Y, Shimada M, Ito Y, Kishi T, Yamaguchi Y, Handa H. Role of N-end rule ubiquitin ligases UBR1 and UBR2 in regulating the leucine-mTOR signaling pathway. Genes Cells. 2010 Apr 1;15(4):339-49. doi: 10.1111/j.1365-2443.2010.01385.x. Epub, 2010 Mar 16. PMID:20298436 doi:http://dx.doi.org/10.1111/j.1365-2443.2010.01385.x
4. ↑ Matta-Camacho E, Kozlov G, Li FF, Gehring K. Structural basis of substrate recognition and specificity in the N-end rule pathway. Nat Struct Mol Biol. 2010 Oct;17(10):1182-7. Epub 2010 Sep 12. PMID:20835242 doi:10.1038/nsmb.1894