Human 14-3-3 sigma CLU3 mutant complexed with short HSPB6 phosphopeptide

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

Starting Model: experimental
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Structural Basis for the Interaction of a Human Small Heat Shock Protein with the 14-3-3 Universal Signaling Regulator.

Sluchanko, N.N.Beelen, S.Kulikova, A.A.Weeks, S.D.Antson, A.A.Gusev, N.B.Strelkov, S.V.

(2017) Structure 25: 305-316

  • DOI: https://doi.org/10.1016/j.str.2016.12.005
  • Primary Citation of Related Structures:  
    5LTW, 5LU1, 5LU2, 5LUM

  • PubMed Abstract: 

    By interacting with hundreds of protein partners, 14-3-3 proteins coordinate vital cellular processes. Phosphorylation of the small heat shock protein, HSPB6, within its intrinsically disordered N-terminal domain activates its interaction with 14-3-3, ultimately triggering smooth muscle relaxation. After analyzing the binding of an HSPB6-derived phosphopeptide to 14-3-3 using isothermal calorimetry and X-ray crystallography, we have determined the crystal structure of the complete assembly consisting of the 14-3-3 dimer and full-length HSPB6 dimer and further characterized this complex in solution using fluorescence spectroscopy, small-angle X-ray scattering, and limited proteolysis. We show that selected intrinsically disordered regions of HSPB6 are transformed into well-defined conformations upon the interaction, whereby an unexpectedly asymmetric structure is formed. This structure provides the first atomic resolution snapshot of a human small HSP in functional state, explains how 14-3-3 proteins sequester their regulatory partners, and can inform the design of small-molecule interaction modifiers to be used as myorelaxants.

  • Organizational Affiliation

    Laboratory of Structural Biochemistry of Proteins, A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences, 119071 Moscow, Russia. Electronic address: nikolai.sluchanko@mail.ru.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
14-3-3 protein sigma
A, B, E, F
234Homo sapiensMutation(s): 3 
Gene Names: SFNHME1
UniProt & NIH Common Fund Data Resources
Find proteins for P31947 (Homo sapiens)
Explore P31947 
Go to UniProtKB:  P31947
GTEx:  ENSG00000175793 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31947
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock protein beta-6
C, D, G, H
8Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O14558 (Homo sapiens)
Explore O14558 
Go to UniProtKB:  O14558
GTEx:  ENSG00000004776 
Entity Groups  
UniProt GroupO14558
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.61α = 90
b = 104.01β = 93.89
c = 123.07γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-02-01
    Type: Initial release
  • Version 1.1: 2017-02-15
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description