6QZS

14-3-3 sigma in complex with FOXO1 pS256 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

AMPK and AKT protein kinases hierarchically phosphorylate the N-terminus of the FOXO1 transcription factor, modulating interactions with 14-3-3 proteins.

Saline, M.Badertscher, L.Wolter, M.Lau, R.Gunnarsson, A.Jacso, T.Norris, T.Ottmann, C.Snijder, A.

(2019) J Biol Chem 294: 13106-13116

  • DOI: 10.1074/jbc.RA119.008649
  • Primary Citation of Related Structures:  
    6QZR, 6QZS

  • PubMed Abstract: 
  • Forkhead box protein O1 (FOXO1) is a transcription factor involved in various cellular processes such as glucose metabolism, development, stress resistance, and tumor suppression. FOXO1's transcriptional activity is controlled by different environmen ...

    Forkhead box protein O1 (FOXO1) is a transcription factor involved in various cellular processes such as glucose metabolism, development, stress resistance, and tumor suppression. FOXO1's transcriptional activity is controlled by different environmental cues through a myriad of posttranslational modifications. In response to growth factors, the serine/threonine kinase AKT phosphorylates Thr 24 and Ser 256 in FOXO1 to stimulate binding of 14-3-3 proteins, causing FOXO1 inactivation. In contrast, low nutrient and energy levels induce FOXO1 activity. AMP-activated protein kinase (AMPK), a master regulator of cellular energy homeostasis, partly mediates this effect through phosphorylation of Ser 383 and Thr 649 in FOXO1. In this study, we identified Ser 22 as an additional AMPK phosphorylation site in FOXO1's N terminus, with Ser 22 phosphorylation preventing binding of 14-3-3 proteins. The crystal structure of a FOXO1 peptide in complex with 14-3-3 σ at 2.3 Å resolution revealed that this is a consequence of both steric hindrance and electrostatic repulsion. Furthermore, we found that AMPK-mediated Ser 22 phosphorylation impairs Thr 24 phosphorylation by AKT in a hierarchical manner. Thus, numerous mechanisms maintain FOXO1 activity via AMPK signaling. AMPK-mediated Ser 22 phosphorylation directly and indirectly averts binding of 14-3-3 proteins, whereas phosphorylation of Ser 383 and Thr 649 complementarily stimulates FOXO1 activity. Our results shed light on a mechanism that integrates inputs from both AMPK and AKT signaling pathways in a small motif to fine-tune FOXO1 transcriptional activity.


    Organizational Affiliation

    Discovery Biology, Discovery Sciences, R&D, AstraZeneca, Gothenburg, Sweden arjan.snijder@astrazeneca.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
14-3-3 protein sigmaA, B253Homo sapiensMutation(s): 0 
Gene Names: SFNHME1
Find proteins for P31947 (Homo sapiens)
Explore P31947 
Go to UniProtKB:  P31947
NIH Common Fund Data Resources
PHAROS  P31947
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
FOXO1 pS256 siteC, P12Homo sapiensMutation(s): 0 
Gene Names: FOXO1FKHRFOXO1A
Find proteins for Q12778 (Homo sapiens)
Explore Q12778 
Go to UniProtKB:  Q12778
NIH Common Fund Data Resources
PHAROS  Q12778
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
B3P
Query on B3P

Download CCD File 
A
2-[3-(2-HYDROXY-1,1-DIHYDROXYMETHYL-ETHYLAMINO)-PROPYLAMINO]-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C11 H26 N2 O6
HHKZCCWKTZRCCL-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A,BL-PEPTIDE LINKINGC3 H7 N O3 SCYS
SEP
Query on SEP
C,PL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.429α = 90
b = 104.619β = 90
c = 156.866γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European CommissionNetherlands--

Revision History 

  • Version 1.0: 2019-07-31
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Derived calculations
  • Version 1.2: 2019-09-11
    Changes: Data collection, Database references