5DUI

Identification of a new FoxO1 binding site that precludes CREB binding at the glucose-6-phosphatase catalytic subunit gene promoter

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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Literature

Crystal structures reveal a new and novel FoxO1 binding site within the human glucose-6-phosphatase catalytic subunit 1 gene promoter.

Singh, P., Han, E.H., Endrizzi, J.A., O'Brien, R.M., Chi, Y.I.

(2017) J Struct Biol 198: 54-64

  • DOI: 10.1016/j.jsb.2017.02.006
  • Primary Citation of Related Structures:  
    5DUI

  • PubMed Abstract: 

    • Human glucose-6-phosphatase plays a vital role in blood glucose homeostasis and holds promise as a therapeutic target for diabetes. Expression of its catalytic subunit gene 1 (G6PC1) is tightly regulated by metabolic-response transcription factors such as FoxO1 and CREB ...

    Human glucose-6-phosphatase plays a vital role in blood glucose homeostasis and holds promise as a therapeutic target for diabetes. Expression of its catalytic subunit gene 1 (G6PC1) is tightly regulated by metabolic-response transcription factors such as FoxO1 and CREB. Although at least three potential FoxO1 binding sites (insulin response elements, IREs) and one CREB binding site (cAMP response element, CRE) within the proximal region of the G6PC1 promoter have been identified, the interplay between FoxO1 and CREB and between FoxO1 bound at multiple IREs has not been well characterized. Here we present the crystal structures of the FoxO1 DNA binding domain in complex with the G6PC1 promoter. These complexes reveal the presence of a new non-consensus FoxO1 binding site that overlaps the CRE, suggesting a mutual exclusion mechanism for FoxO1 and CREB binding at the G6PC1 promoter. Additional findings include (i) non-canonical FoxO1 recognition sites, (ii) incomplete FoxO1 occupancies at the available IRE sites, and (iii) FoxO1 dimeric interactions that may play a role in stabilizing DNA looping. These findings provide insight into the regulation of G6PC1 gene transcription by FoxO1, and demonstrate a high versatility of target gene recognition by FoxO1 that correlates with its diverse roles in biology.

    Organizational Affiliation: 

    Section of Structural Biology, Hormel Institute, University of Minnesota, Austin, MN 55912, United States. Electronic address: ychi@hi.umn.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Forkhead box protein O1A, B111Homo sapiensMutation(s): 0 
Gene Names: FOXO1, FKHR, FOXO1A
UniProt & NIH Common Fund Data Resources
Find proteins for Q12778 (Homo sapiens)
Explore Q12778 
Go to UniProtKB:  Q12778
PHAROS:  Q12778
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ12778
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*TP*TP*TP*CP*TP*AP*TP*TP*TP*TP*AP*CP*GP*TP*AP*AP*AP*TP*CP*A)-3')C21Homo sapiens
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*TP*GP*AP*TP*TP*TP*AP*CP*GP*TP*AP*AP*AP*AP*TP*AP*GP*AP*AP*A)-3')D21Homo sapiens
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.61α = 90
b = 79.026β = 90.79
c = 48.266γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-21
    Type: Initial release
  • Version 1.1: 2017-12-20
    Changes: Database references, Derived calculations