5W46

Structure of S65D Phosphomimetic Ubiquitin Refined at 1.2 Angstroms Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.18 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Impact of different ionization states of phosphorylated Serine-65 on ubiquitin structure and interactions.

Kazansky, Y.Lai, M.Y.Singh, R.K.Fushman, D.

(2018) Sci Rep 8: 2651-2651

  • DOI: 10.1038/s41598-018-20860-w

  • PubMed Abstract: 
  • The covalent attachment of ubiquitin (Ub) or Ub chains to cellular proteins is a versatile post-translational modification involved in a variety of eukaryotic cellular events. Recently, the post-translational modification of Ub itself by phosphorylat ...

    The covalent attachment of ubiquitin (Ub) or Ub chains to cellular proteins is a versatile post-translational modification involved in a variety of eukaryotic cellular events. Recently, the post-translational modification of Ub itself by phosphorylation has emerged as an important component of the Ub-signaling system. Specifically, Ub phosphorylation at serine-65 was shown to activate parkin-mediated mitochondrial quality control. However, the impact of phosphorylation on Ub structure and interactions is poorly understood. Here we investigate the recently reported structural changes in Ub upon serine-65 phosphorylation, namely, the equilibrium between a native-like and a novel, alternate conformer of phosphorylated Ub (pUb). We show that this equilibrium is pH-dependent, and the two pUb conformers are linked to the different charge states of the phosphate group. We examined pUb binding to a known Ub-receptor and found that the alternate conformer is binding incompetent. Furthermore, serine-65 phosphorylation affects the conformational equilibrium of K48-linked Ub dimers. Lastly, our crystal structure of S65D Ub and NMR data indicate that phosphomimetic mutations do not adequately reproduce the salient features of pUb. Our results suggest that the pH-dependence of the conformations and binding properties of phosphorylated Ub and polyUb could provide an additional level of modulation in Ub-mediated signaling.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD, 20742, USA.,Department of Chemistry and Biochemistry, Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD, 20742, USA. fushman@umd.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Polyubiquitin-B
A, B
76Homo sapiensMutation(s): 1 
Gene Names: UBB
Find proteins for P0CG47 (Homo sapiens)
Go to Gene View: UBB
Go to UniProtKB:  P0CG47
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.18 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 33.456α = 90.00
b = 48.248β = 99.03
c = 41.707γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
Cootmodel building
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM065334

Revision History 

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence
  • Version 1.2: 2019-01-16
    Type: Data collection, Database references