2i1a is a 4 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
DDI1_YEAST Acts as a linker between the 19S proteasome and polyubiquitinated proteins like the HO endonuclease and UFO1 via UBA domain interactions with ubiquitin for their subsequent degradation. Required for S-phase checkpoint control. Appears to act as negative regulator of constitutive exocytosis. May act at the level of secretory vesicle docking and fusion as a competitive inhibitor of SNARE assembly.[1][2][3][4][5][6][7]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
References
↑Lustgarten V, Gerst JE. Yeast VSM1 encodes a v-SNARE binding protein that may act as a negative regulator of constitutive exocytosis. Mol Cell Biol. 1999 Jun;19(6):4480-94. PMID:10330187
↑Clarke DJ, Mondesert G, Segal M, Bertolaet BL, Jensen S, Wolff M, Henze M, Reed SI. Dosage suppressors of pds1 implicate ubiquitin-associated domains in checkpoint control. Mol Cell Biol. 2001 Mar;21(6):1997-2007. PMID:11238935 doi:https://dx.doi.org/10.1128/MCB.21.6.1997-2007.2001
↑Saeki Y, Saitoh A, Toh-e A, Yokosawa H. Ubiquitin-like proteins and Rpn10 play cooperative roles in ubiquitin-dependent proteolysis. Biochem Biophys Res Commun. 2002 May 10;293(3):986-92. PMID:12051757 doi:https://dx.doi.org/10.1016/S0006-291X(02)00340-6
↑Marash M, Gerst JE. Phosphorylation of the autoinhibitory domain of the Sso t-SNAREs promotes binding of the Vsm1 SNARE regulator in yeast. Mol Biol Cell. 2003 Aug;14(8):3114-25. Epub 2003 May 3. PMID:12925750 doi:https://dx.doi.org/10.1091/mbc.E02-12-0804
↑Kaplun L, Tzirkin R, Bakhrat A, Shabek N, Ivantsiv Y, Raveh D. The DNA damage-inducible UbL-UbA protein Ddi1 participates in Mec1-mediated degradation of Ho endonuclease. Mol Cell Biol. 2005 Jul;25(13):5355-62. PMID:15964793 doi:https://dx.doi.org/25/13/5355
↑Diaz-Martinez LA, Kang Y, Walters KJ, Clarke DJ. Yeast UBL-UBA proteins have partially redundant functions in cell cycle control. Cell Div. 2006 Dec 4;1:28. PMID:17144915 doi:https://dx.doi.org/1747-1028-1-28
↑Ivantsiv Y, Kaplun L, Tzirkin-Goldin R, Shabek N, Raveh D. Unique role for the UbL-UbA protein Ddi1 in turnover of SCFUfo1 complexes. Mol Cell Biol. 2006 Mar;26(5):1579-88. PMID:16478980 doi:https://dx.doi.org/26/5/1579
