3QHT

Crystal Structure of the Monobody ySMB-1 bound to yeast SUMO

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 

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This is version 1.2 of the entry. See complete history. 


Literature

Isoform-specific monobody inhibitors of small ubiquitin-related modifiers engineered using structure-guided library design.

Gilbreth, R.N., Truong, K., Madu, I., Koide, A., Wojcik, J.B., Li, N.S., Piccirilli, J.A., Chen, Y., Koide, S.

(2011) Proc Natl Acad Sci U S A 108: 7751-7756

  • DOI: 10.1073/pnas.1102294108
  • Primary Citation of Related Structures:  
    3QHT

  • PubMed Abstract: 

    • Discriminating closely related molecules remains a major challenge in the engineering of binding proteins and inhibitors. Here we report the development of highly selective inhibitors of small ubiquitin-related modifier (SUMO) family proteins. SUMOyl ...

    Discriminating closely related molecules remains a major challenge in the engineering of binding proteins and inhibitors. Here we report the development of highly selective inhibitors of small ubiquitin-related modifier (SUMO) family proteins. SUMOylation is involved in the regulation of diverse cellular processes. Functional differences between two major SUMO isoforms in humans, SUMO1 and SUMO2/3, are thought to arise from distinct interactions mediated by each isoform with other proteins containing SUMO-interacting motifs (SIMs). However, the roles of such isoform-specific interactions are largely uncharacterized due in part to the difficulty in generating high-affinity, isoform-specific inhibitors of SUMO/SIM interactions. We first determined the crystal structure of a "monobody," a designed binding protein based on the fibronectin type III scaffold, bound to the yeast homolog of SUMO. This structure illustrated a mechanism by which monobodies bind to the highly conserved SIM-binding site while discriminating individual SUMO isoforms. Based on this structure, we designed a SUMO-targeted library from which we obtained monobodies that bound to the SIM-binding site of human SUMO1 with K(d) values of approximately 100 nM but bound to SUMO2 400 times more weakly. The monobodies inhibited SUMO1/SIM interactions and, unexpectedly, also inhibited SUMO1 conjugation. These high-affinity and isoform-specific inhibitors will enhance mechanistic and cellular investigations of SUMO biology.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-like protein SMT3A, B98Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SMT3, YDR510W, D9719.15
Find proteins for Q12306 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12306 
Go to UniProtKB:  Q12306
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Monobody ySMB-1C, D97synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.637α = 90
b = 175.462β = 90
c = 52.83γ = 90
Software Package:
Software NamePurpose
MD2data collection
MAR345data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-05-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description