| Structural highlights
Function
[VPS27_YEAST] Component of the ESCRT-0 complex which is the sorting receptor for ubiquitinated cargo proteins at the multivesicular body (MVB) and recruits ESCRT-I to the MVB outer membrane. Controls exit from the prevacuolar compartment (PVC) in both the forward direction to the vacuole and the return to the Golgi. Allows VPS10 to return to the (trans-Golgi network) TGN from the PVC. Might also function as an alternate adapter in the COPIb clathrin-like coat.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
Publication Abstract from PubMed
We previously described structural and functional characterization of the first ubiquitin variant (UbV), UbV.v27.1, engineered by phage display to bind with high affinity to a specific ubiquitin interacting motif (UIM). We identified two substitutions relative to ubiquitin (Gly10Val/His68Tyr) that were critical for enhancing binding affinity but could only rationalize the mechanism of action of the Tyr68 substitution. Here we extend our characterization and uncover the mechanism by which the Val10 substitution enhances binding affinity. We show that Val10 in UbV.v27.1 drives UbV dimerization through an intermolecular beta-strand exchange. Dimerization serves to increase the contact surface between the UIM and UbV and also affords direct contacts between two UIMs through an overall 2:2 binding stoichiometry. Our identification of the role of Val10 in UbV dimerization suggests a general means for the development of dimeric UbVs with improved affinity and specificity relative to their monomeric UbV counterparts. This article is protected by copyright. All rights reserved.
Dimerization of a ubiquitin variant leads to high affinity interactions with a ubiquitin interacting motif.,Manczyk N, Veggiani G, Gish GD, Yates BP, Ernst A, Sidhu SS, Sicheri F Protein Sci. 2019 Feb 21. doi: 10.1002/pro.3593. PMID:30793400[17]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Bilodeau PS, Winistorfer SC, Kearney WR, Robertson AD, Piper RC. Vps27-Hse1 and ESCRT-I complexes cooperate to increase efficiency of sorting ubiquitinated proteins at the endosome. J Cell Biol. 2003 Oct 27;163(2):237-43. PMID:14581452 doi:10.1083/jcb.200305007
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- ↑ Eugster A, Pecheur EI, Michel F, Winsor B, Letourneur F, Friant S. Ent5p is required with Ent3p and Vps27p for ubiquitin-dependent protein sorting into the multivesicular body. Mol Biol Cell. 2004 Jul;15(7):3031-41. Epub 2004 Apr 23. PMID:15107463 doi:10.1091/mbc.E03-11-0793
- ↑ Bowers K, Lottridge J, Helliwell SB, Goldthwaite LM, Luzio JP, Stevens TH. Protein-protein interactions of ESCRT complexes in the yeast Saccharomyces cerevisiae. Traffic. 2004 Mar;5(3):194-210. PMID:15086794 doi:10.1111/j.1600-0854.2004.00169.x
- ↑ Gabriely G, Kama R, Gerst JE. Involvement of specific COPI subunits in protein sorting from the late endosome to the vacuole in yeast. Mol Cell Biol. 2007 Jan;27(2):526-40. Epub 2006 Nov 13. PMID:17101773 doi:MCB.00577-06
- ↑ Curtiss M, Jones C, Babst M. Efficient cargo sorting by ESCRT-I and the subsequent release of ESCRT-I from multivesicular bodies requires the subunit Mvb12. Mol Biol Cell. 2007 Feb;18(2):636-45. Epub 2006 Nov 29. PMID:17135292 doi:E06-07-0588
- ↑ Manczyk N, Veggiani G, Gish GD, Yates BP, Ernst A, Sidhu SS, Sicheri F. Dimerization of a ubiquitin variant leads to high affinity interactions with a ubiquitin interacting motif. Protein Sci. 2019 Feb 21. doi: 10.1002/pro.3593. PMID:30793400 doi:http://dx.doi.org/10.1002/pro.3593
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