3MTN | pdb_00003mtn

Usp21 in complex with a ubiquitin-based, USP21-specific inhibitor

• PDB DOI: https://doi.org/10.2210/pdb3MTN/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2010-04-30 Released: 2010-06-09 
• Deposition Author(s): Walker, J.R., Avvakumov, G.V., Xue, S., Li, Y., Ernst, A., Sidhu, S., Weigelt, J., Bountra, C., Edwards, A.M., Arrowsmith, C.H., Bochkarev, A., Dhe-Paganon, S., Structural Genomics Consortium (SGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 
  0.273 (Depositor), 0.257 (DCC) 
• R-Value Work: 
  0.218 (Depositor) 
• R-Value Observed: 
  0.220 (Depositor) 

Starting Model: experimental

Literature

A strategy for modulation of enzymes in the ubiquitin system.

Ernst, A., Avvakumov, G., Tong, J., Fan, Y., Zhao, Y., Alberts, P., Persaud, A., Walker, J.R., Neculai, A.M., Neculai, D., Vorobyov, A., Garg, P., Beatty, L., Chan, P.K., Juang, Y.C., Landry, M.C., Yeh, C., Zeqiraj, E., Karamboulas, K., Allali-Hassani, A., Vedadi, M., Tyers, M., Moffat, J., Sicheri, F., Pelletier, L., Durocher, D., Raught, B., Rotin, D., Yang, J., Moran, M.F., Dhe-Paganon, S., Sidhu, S.S.

(2013) Science 339: 590-595

• PubMed: 23287719 
• DOI: https://doi.org/10.1126/science.1230161
• Primary Citation Related Structures: 
  3I3T, 3MTN, 3N3K, 3V6E, 4I6L


• PubMed Abstract: 
  

  The ubiquitin system regulates virtually all aspects of cellular function. We report a method to target the myriad enzymes that govern ubiquitination of protein substrates. We used massively diverse combinatorial libraries of ubiquitin variants to develop inhibitors of four deubiquitinases (DUBs) and analyzed the DUB-inhibitor complexes with crystallography. We extended the selection strategy to the ubiquitin conjugating (E2) and ubiquitin ligase (E3) enzymes and found that ubiquitin variants can also enhance enzyme activity. Last, we showed that ubiquitin variants can bind selectively to ubiquitin-binding domains. Ubiquitin variants exhibit selective function in cells and thus enable orthogonal modulation of specific enzymatic steps in the ubiquitin system.

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Organizational Affiliation: 
• Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, 160 College Street, Toronto, Ontario, Canada.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 103.04 kDa 
• Atom Count: 6,349 
• Modeled Residue Count: 784 
• Deposited Residue Count: 916 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ubiquitin carboxyl-terminal hydrolase 21	A, C	373	Homo sapiens	Mutation(s): 0  Gene Names: PP1490, USP21, USP23 EC: 3.1.2.15 (PDB Primary Data), 3.4.19.12 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UK80 (Homo sapiens) Explore Q9UK80  Go to UniProtKB:  Q9UK80
PHAROS:  Q9UK80 GTEx:  ENSG00000143258

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
UBIQUITIN VARIANT UBV.21.4	B, D	85	Homo sapiens	Mutation(s): 3  Gene Names: RPS27A, UBA52, UBA80, UBB, UBC, UBCEP1, UBCEP2, UBQ
UniProt & NIH Common Fund Data Resources
Find proteins for P0CG48 (Homo sapiens) Explore P0CG48  Go to UniProtKB:  P0CG48
PHAROS:  P0CG48 GTEx:  ENSG00000150991

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	H [auth A], L [auth C]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN	E [auth A], J [auth C]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL	F [auth A], G [auth A], I [auth A], K [auth C]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free:  0.273 (Depositor), 0.257 (DCC) 
• R-Value Work:  0.218 (Depositor) 
• R-Value Observed: 0.220 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 169.065	α = 90
b = 58.235	β = 121.19
c = 133.596	γ = 90

Software Package:

Software Name	Purpose
StructureStudio	data collection
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-06-09 
Deposition Author(s): Walker, J.R., Avvakumov, G.V., Xue, S., Li, Y., Ernst, A., Sidhu, S., Weigelt, J., Bountra, C., Edwards, A.M., Arrowsmith, C.H., Bochkarev, A., Dhe-Paganon, S., Structural Genomics Consortium (SGC)

Revision History  

• Version 1.0: 2010-06-09
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2013-02-27
  Changes: Database references
• Version 1.3: 2023-09-06
  Changes: Data collection, Database references, Derived calculations, Refinement description