6D74

Direct Activation of the Executioner Domain of MLKL by a Select Repertoire of Inositol Phosphates


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Direct Activation of Human MLKL by a Select Repertoire of Inositol Phosphate Metabolites.

McNamara, D.E.Dovey, C.M.Hale, A.T.Quarato, G.Grace, C.R.Guibao, C.D.Diep, J.Nourse, A.Cai, C.R.Wu, H.Kalathur, R.C.Green, D.R.York, J.D.Carette, J.E.Moldoveanu, T.

(2019) Cell Chem Biol 26: 863

  • DOI: 10.1016/j.chembiol.2019.03.010
  • Primary Citation of Related Structures:  
    6D74

  • PubMed Abstract: 
  • Necroptosis is an inflammatory form of programmed cell death executed through plasma membrane rupture by the pseudokinase mixed lineage kinase domain-like (MLKL). We previously showed that MLKL activation requires metabolites of the inositol phosphate (IP) pathway ...

    Necroptosis is an inflammatory form of programmed cell death executed through plasma membrane rupture by the pseudokinase mixed lineage kinase domain-like (MLKL). We previously showed that MLKL activation requires metabolites of the inositol phosphate (IP) pathway. Here we reveal that I(1,3,4,6)P 4 , I(1,3,4,5,6)P 5 , and IP 6 promote membrane permeabilization by MLKL through directly binding the N-terminal executioner domain (NED) and dissociating its auto-inhibitory region. We show that IP 6 and inositol pentakisphosphate 2-kinase (IPPK) are required for necroptosis as IPPK deletion ablated IP 6 production and inhibited necroptosis. The NED auto-inhibitory region is more extensive than originally described and single amino acid substitutions along this region induce spontaneous necroptosis by MLKL. Activating IPs bind three sites with affinity of 100-600 μM to destabilize contacts between the auto-inhibitory region and NED, thereby promoting MLKL activation. We therefore uncover MLKL's activating switch in NED triggered by a select repertoire of IP metabolites.


    Related Citations: 
    • MLKL Requires the Inositol Phosphate Code to Execute Necroptosis.
      Dovey, C.M., Diep, J., Clarke, B.P., Hale, A.T., McNamara, D.E., Guo, H., Brown, N.W., Cao, J.Y., Grace, C.R., Gough, P.J., Bertin, J., Dixon, S.J., Fiedler, D., Mocarski, E.S., Kaiser, W.J., Moldoveanu, T., York, J.D., Carette, J.E.
      (2018) Mol Cell 70: 936

    Organizational Affiliation

    Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105, USA. Electronic address: tudor.moldoveanu@stjude.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mixed lineage kinase domain-like proteinA157Homo sapiensMutation(s): 0 
Gene Names: MLKL
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NB16 (Homo sapiens)
Explore Q8NB16 
Go to UniProtKB:  Q8NB16
PHAROS:  Q8NB16
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 6D74 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-15
    Type: Initial release
  • Version 1.1: 2019-07-03
    Changes: Data collection, Database references