3ISM

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 

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This is version 1.1 of the entry. See complete history. 

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

  • 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 ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CG8862
A, B
267Drosophila melanogasterMutation(s): 0 
Gene Names: EndoG (dEndoG, Dmel\CG8862, endoG)
Find proteins for Q7JXB9 (Drosophila melanogaster)
Go to UniProtKB:  Q7JXB9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CG4930
C
359Drosophila melanogasterMutation(s): 1 
Gene Names: EndoGI (BG:DS07473.2, dEndoGI, Dmel\CG4930, endoGI)
EC: 3.6.-.-
Find proteins for Q9V3V9 (Drosophila melanogaster)
Go to UniProtKB:  Q9V3V9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG
Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
TRS
Query on TRS
Download SDF File 
Download CCD File 
A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 70.790α = 90.00
b = 109.150β = 90.00
c = 121.080γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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