6DC0

Tribbles (TRIB1) pseudokinase fused to CCAAT-enhancer binding protein (C/EBPalpha) degron


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Substrate binding allosterically relieves autoinhibition of the pseudokinase TRIB1.

Jamieson, S.A.Ruan, Z.Burgess, A.E.Curry, J.R.McMillan, H.D.Brewster, J.L.Dunbier, A.K.Axtman, A.D.Kannan, N.Mace, P.D.

(2018) Sci Signal 11

  • DOI: 10.1126/scisignal.aau0597
  • Primary Citation of Related Structures:  
    6DC0

  • PubMed Abstract: 
  • The Tribbles family of pseudokinases recruits substrates to the ubiquitin ligase COP1 to facilitate ubiquitylation. CCAAT/enhancer-binding protein (C/EBP) family transcription factors are crucial Tribbles substrates in adipocyte and myeloid cell developm ...

    The Tribbles family of pseudokinases recruits substrates to the ubiquitin ligase COP1 to facilitate ubiquitylation. CCAAT/enhancer-binding protein (C/EBP) family transcription factors are crucial Tribbles substrates in adipocyte and myeloid cell development. We found that the TRIB1 pseudokinase was able to recruit various C/EBP family members and that the binding of C/EBPβ was attenuated by phosphorylation. To explain the mechanism of C/EBP recruitment, we solved the crystal structure of TRIB1 in complex with C/EBPα, which revealed that TRIB1 underwent a substantial conformational change relative to its substrate-free structure and bound C/EBPα in a pseudosubstrate-like manner. Crystallographic analysis and molecular dynamics and subsequent biochemical assays showed that C/EBP binding triggered allosteric changes that link substrate recruitment to COP1 binding. These findings offer a view of pseudokinase regulation with striking parallels to bona fide kinase regulation-by means of the activation loop and αC helix-and raise the possibility of small molecules targeting either the activation "loop-in" or "loop-out" conformations of Tribbles pseudokinases.


    Organizational Affiliation

    Biochemistry Department, School of Biomedical Sciences, University of Otago, P.O. Box 56, 710 Cumberland Street, Dunedin 9054, New Zealand. peter.mace@otago.ac.nz.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tribbles homolog 1,CCAAT/enhancer-binding protein alpha AB292Homo sapiensMutation(s): 0 
Gene Names: TRIB1C8FWGIG2TRB1CEBPACEBP
Find proteins for Q96RU8 (Homo sapiens)
Explore Q96RU8 
Go to UniProtKB:  Q96RU8
NIH Common Fund Data Resources
PHAROS:  Q96RU8
Find proteins for P49715 (Homo sapiens)
Explore P49715 
Go to UniProtKB:  P49715
NIH Common Fund Data Resources
PHAROS:  P49715
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.223 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.809α = 90
b = 98.809β = 90
c = 332.705γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Health Research Council (HRC)New Zealand--
Royal Society of New ZealandNew ZealandRutherford Discovery Fellowship

Revision History 

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence, Structure summary