5K28

Structure of the unbound SH3 domain of MLK3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Identification of two distinct peptide-binding pockets in the SH3 domain of human mixed-lineage kinase 3.

Kokoszka, M.E.Kall, S.L.Khosla, S.McGinnis, J.E.Lavie, A.Kay, B.K.

(2018) J Biol Chem 293: 13553-13565

  • DOI: https://doi.org/10.1074/jbc.RA117.000262
  • Primary Citation of Related Structures:  
    5K26, 5K28, 6AQB

  • PubMed Abstract: 

    Mixed-lineage kinase 3 (MLK3; also known as MAP3K11) is a Ser/Thr protein kinase widely expressed in normal and cancerous tissues, including brain, lung, liver, heart, and skeletal muscle tissues. Its Src homology 3 (SH3) domain has been implicated in MLK3 autoinhibition and interactions with other proteins, including those from viruses. The MLK3 SH3 domain contains a six-amino-acid insert corresponding to the n-Src insert, suggesting that MLK3 may bind additional peptides. Here, affinity selection of a phage-displayed combinatorial peptide library for MLK3's SH3 domain yielded a 13-mer peptide, designated "MLK3 SH3-interacting peptide" (MIP). Unlike most SH3 domain peptide ligands, MIP contained a single proline. The 1.2-Å crystal structure of the MIP-bound SH3 domain revealed that the peptide adopts a β-hairpin shape, and comparison with a 1.5-Å apo SH3 domain structure disclosed that the n-Src loop in SH3 undergoes an MIP-induced conformational change. A 1.5-Å structure of the MLK3 SH3 domain bound to a canonical proline-rich peptide from hepatitis C virus nonstructural 5A (NS5A) protein revealed that it and MIP bind the SH3 domain at two distinct sites, but biophysical analyses suggested that the two peptides compete with each other for SH3 binding. Moreover, SH3 domains of MLK1 and MLK4, but not MLK2, also bound MIP, suggesting that the MLK1-4 family may be differentially regulated through their SH3 domains. In summary, we have identified two distinct peptide-binding sites in the SH3 domain of MLK3, providing critical insights into mechanisms of ligand binding by the MLK family of kinases.


  • Organizational Affiliation

    From the Departments of Biological Sciences and.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitogen-activated protein kinase kinase kinase 11
A, B
64Homo sapiensMutation(s): 0 
Gene Names: MAP3K11MLK3PTK1SPRK
EC: 2.7.11.25
UniProt & NIH Common Fund Data Resources
Find proteins for Q16584 (Homo sapiens)
Explore Q16584 
Go to UniProtKB:  Q16584
PHAROS:  Q16584
GTEx:  ENSG00000173327 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16584
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.892α = 90
b = 57.892β = 90
c = 76.122γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-13
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Data collection, Database references
  • Version 1.2: 2023-09-27
    Changes: Data collection, Database references, Refinement description