The crystal structure of mouse PK38

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

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The Structures of the Kinase Domain and Uba Domain of Mpk38 Suggest the Activation Mechanism for Kinase Activity.

Cho, Y.S.Yoo, J.Park, S.Cho, H.S.

(2014) Acta Crystallogr D Biol Crystallogr 70: 514

  • DOI: https://doi.org/10.1107/S1399004713027806
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Murine protein serine/threonine kinase 38 (MPK38) is the murine orthologue of human maternal embryonic leucine-zipper kinase (MELK), which belongs to the SNF1/AMPK family. MELK is considered to be a promising drug target for anticancer therapy because overexpression and hyperactivation of MELK is correlated with several human cancers. Activation of MPK38 requires the extended sequence (ExS) containing the ubiquitin-associated (UBA) linker and UBA domain and phosphorylation of the activation loop. However, the activation mechanism of MPK38 is unknown. This paper reports the crystal structure of MPK38 (T167E), which mimics a phosphorylated state of the activation loop, in complex with AMP-PNP. In the MPK38 structure, the UBA linker forces an inward movement of the αC helix. Phosphorylation of the activation loop then induces movement of the activation loop towards the C-lobe and results in interlobar cleft closure. These processes generate a fully active state of MPK38. This structure suggests that MPK38 has a similar molecular mechanism regulating activation as in other kinases of the SNF1/AMPK family.

  • Organizational Affiliation

    Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q61846 (Mus musculus)
Explore Q61846 
Go to UniProtKB:  Q61846
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ61846
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.799α = 90
b = 75.711β = 90
c = 128.088γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-12
    Type: Initial release
  • Version 1.1: 2014-02-26
    Changes: Database references
  • Version 2.0: 2023-12-20
    Changes: Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description