3ISM

Crystal structure of the EndoG/EndoGI complex: Mechanism of EndoG inhibition

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

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Literature

Crystal structure of the EndoG/EndoGI complex: mechanism of EndoG inhibition.

Loll, B., Gebhardt, M., Wahle, E., Meinhart, A.

(2009) Nucleic Acids Res 37: 7312-7320

  • DOI: 10.1093/nar/gkp770
  • Primary Citation of Related Structures:  
    3ISM

  • PubMed Abstract: 

    • EndoG is a ubiquitous nuclease that is translocated into the nucleus during apoptosis to participate in DNA degradation. The enzyme cleaves double- and single-stranded DNA and RNA. Related nucleases are found in eukaryotes and prokaryotes, which have evolved sophisticated mechanisms for genome protection against self-antagonizing nuclease activity ...

    EndoG is a ubiquitous nuclease that is translocated into the nucleus during apoptosis to participate in DNA degradation. The enzyme cleaves double- and single-stranded DNA and RNA. Related nucleases are found in eukaryotes and prokaryotes, which have evolved sophisticated mechanisms for genome protection against self-antagonizing nuclease activity. Common mechanisms of inhibition are secretion, sequestration into a separate cellular compartment or by binding to protein inhibitors. Although EndoG is silenced by compartmentalization into the mitochondrial intermembrane space, a nucleus-localized protein inhibitor protects cellular polynucleotides from degradation by stray EndoG under non-apoptotic conditions in Drosophila. Here, we report the first three-dimensional structure of EndoG in complex with its inhibitor EndoGI. Although the mechanism of inhibition is reminiscent of bacterial protein inhibitors, EndoGI has evolved independently from a generic protein-protein interaction module. EndoGI is a two-domain protein that binds the active sites of two monomers of EndoG, with EndoG being sandwiched between EndoGI. Since the amino acid sequences of eukaryotic EndoG homologues are highly conserved, this model is valid for eukaryotic dimeric EndoG in general. The structure indicates that the two active sites of EndoG occupy the most remote spatial position possible at the molecular surface and a concerted substrate processing is unlikely.

    Organizational Affiliation: 

    Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CG8862A, B267Drosophila melanogasterMutation(s): 0 
Gene Names: CG8862, Dmel_CG8862, endoG, EndoG, dEndoG, Dmel\CG8862
EC: 3.1.30
Find proteins for Q7JXB9 (Drosophila melanogaster)
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Go to UniProtKB:  Q7JXB9
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CG4930C359Drosophila melanogasterMutation(s): 1 
Gene Names: endoGI, BG:DS07473.2, CG4930, Dmel_CG4930, EndoGI, dEndoGI, Dmel\CG4930
EC: 3.6.1.3 (PDB Primary Data), 3.6 (UniProt)
Find proteins for Q9V3V9 (Drosophila melanogaster)
Explore Q9V3V9 
Go to UniProtKB:  Q9V3V9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TRS
Query on TRS
Download Ideal Coordinates CCD File 
 E [auth A]2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
 D [auth A], F [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.79α = 90
b = 109.15β = 90
c = 121.08γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-09-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance