Crystal structure of Cbl-b TKB domain in complex with Cblin

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.204 

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Structural analysis of the TKB domain of ubiquitin ligase Cbl-b complexed with its small inhibitory peptide, Cblin

Ohno, A.Ochi, A.Maita, N.Ueji, T.Bando, A.Nakao, R.Hirasaka, K.Abe, T.Teshima-Kondo, S.Nemoto, H.Okumura, Y.Higashibata, A.Yano, S.Tochio, H.Nikawa, T.

(2016) Arch Biochem Biophys 594: 1-7

  • DOI: https://doi.org/10.1016/j.abb.2016.02.014
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cbl-b is a RING-type ubiquitin ligase. Previously, we showed that Cbl-b-mediated ubiquitination and proteosomal degradation of IRS-1 contribute to muscle atrophy caused by unloading stress. The phospho-pentapeptide DGpYMP (Cblin) mimics Tyr612-phosphorylated IRS-1 and inhibits the Cbl-b-mediated ubiquitination and degradation of IRS-1 in vitro and in vivo. In this study, we confirmed the direct interaction between Cblin and the TKB domain of Cbl-b using NMR. Moreover, we showed that the shortened tripeptide GpYM also binds to the TKB domain. To elucidate the inhibitory mechanism of Cblin, we solved the crystal structure of the TKB-Cblin complex at a resolution of 2.5 Å. The pY in Cblin inserts into a positively charged pocket in the TKB domain via hydrogen-bond networks and hydrophobic interactions. Within this complex, the Cblin structure closely resembles the TKB-bound form of another substrate-derived phosphopeptide, Zap-70-derived phosphopeptide. These peptides lack the conserved intrapeptidyl hydrogen bond between pY and a conserved residue involved in TKB-domain binding. Instead of the conserved interaction, these peptides specifically interact with the TKB domain. Based on this binding mode of Cblin to the TKB domain, we can design drugs against unloading-mediated muscle atrophy.

  • Organizational Affiliation

    Departments of Nutritional Physiology, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima, 770-8503, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase CBL-B
A, B, C
307Mus musculusMutation(s): 0 
Gene Names: Cblb
EC: 6.3.2
Find proteins for Q3TTA7 (Mus musculus)
Explore Q3TTA7 
Go to UniProtKB:  Q3TTA7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3TTA7
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CblinD [auth E]5Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P35569 (Mus musculus)
Explore P35569 
Go to UniProtKB:  P35569
IMPC:  MGI:99454
Entity Groups  
UniProt GroupP35569
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.144α = 90
b = 94.091β = 90
c = 133.949γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
Cootmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-02
    Type: Initial release
  • Version 1.1: 2016-03-09
    Changes: Database references
  • Version 1.2: 2020-02-26
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection