2G8U

B. halodurans RNase H catalytic domain D132N mutant in complex with Mg2+ and RNA/DNA hybrid (non-P nick at the active site)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Stepwise analyses of metal ions in RNase H catalysis from substrate destabilization to product release.

Nowotny, M.Yang, W.

(2006) Embo J. 25: 1924-1933

  • DOI: 10.1038/sj.emboj.7601076
  • Primary Citation of Related Structures:  2G8F, 2G8H, 2G8I, 2G8K, 2G8V, 2G8W

  • PubMed Abstract: 
  • In two-metal catalysis, metal ion A has been proposed to activate the nucleophile and metal ion B to stabilize the transition state. We recently reported crystal structures of RNase H-RNA/DNA substrate complexes obtained at 1.5-2.2 Angstroms. We have ...

    In two-metal catalysis, metal ion A has been proposed to activate the nucleophile and metal ion B to stabilize the transition state. We recently reported crystal structures of RNase H-RNA/DNA substrate complexes obtained at 1.5-2.2 Angstroms. We have now determined and report here structures of reaction intermediate and product complexes of RNase H at 1.65-1.85 Angstroms. The movement of the two metal ions suggests how they may facilitate RNA hydrolysis during the catalytic process. Firstly, metal ion A may assist nucleophilic attack by moving towards metal ion B and bringing the nucleophile close to the scissile phosphate. Secondly, metal ion B transforms from an irregular coordination in the substrate complex to a more regular geometry in the product complex. The exquisite sensitivity of Mg(2+) to the coordination environment likely destabilizes the enzyme-substrate complex and reduces the energy barrier to form product. Lastly, product release probably requires dissociation of metal ion A, which is inhibited by either high concentrations of divalent cations or mutation of an assisting protein residue.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease H
A
142Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125)Gene Names: rnhA
EC: 3.1.26.4
Find proteins for Q9KEI9 (Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125))
Go to UniProtKB:  Q9KEI9
Entity ID: 1
MoleculeChainsLengthOrganism
5'-R(*UP*CP*GP*AP*CP*A)-3'B6N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*AP*TP*GP*TP*CP*G)-3'C6N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.223 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 83.878α = 90.00
b = 35.412β = 98.66
c = 63.839γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-03-03 
  • Released Date: 2006-04-25 
  • Deposition Author(s): Nowotny, M., Yang, W.

Revision History 

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance