6DOQ

Crystal Structure of Bacillus Halodurans Ribonuclease H1 in Complex with an RNA/DNA Hybrid: Reaction in 2 mM Mg2+ and 200 mM K+ for 120 s at 21 C (dataset 2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.422 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.149 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Cation trafficking propels RNA hydrolysis.

Samara, N.L.Yang, W.

(2018) Nat. Struct. Mol. Biol. 25: 715-721

  • DOI: 10.1038/s41594-018-0099-4
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Catalysis by members of the RNase H superfamily of enzymes is generally believed to require only two Mg <sup>2+ </sup> ions that are coordinated by active-site carboxylates. By examining the catalytic process of Bacillus halodurans RNase H1 in crysta ...

    Catalysis by members of the RNase H superfamily of enzymes is generally believed to require only two Mg 2+ ions that are coordinated by active-site carboxylates. By examining the catalytic process of Bacillus halodurans RNase H1 in crystallo, however, we found that the two canonical Mg 2+ ions and an additional K + failed to align the nucleophilic water for RNA cleavage. Substrate alignment and product formation required a second K + and a third Mg 2+ , which replaced the first K + and departed immediately after cleavage. A third transient Mg 2+ has also been observed for DNA synthesis, but in that case it coordinates the leaving group instead of the nucleophile as in the case of the RNase H1 hydrolysis reaction. These transient cations have no contact with the enzymes. Other DNA and RNA enzymes that catalyze consecutive cleavage and strand-transfer reactions in a single active site may similarly require cation trafficking coordinated by the substrate.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), US National Institutes of Health (NIH), Bethesda, MD, USA.,Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), US National Institutes of Health (NIH), Bethesda, MD, USA. wei.yang@nih.gov.,Section on Biological Chemistry, National Institute of Dental and Craniofacial Research (NIDCR), US National Institutes of Health, Bethesda, MD, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease H
A
142Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125)Mutation(s): 0 
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: 2
MoleculeChainsLengthOrganism
RNA (5'-R(*AP*CP*AP*U)-3')B4synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
RNA (5'-R(P*CP*G)-3')b2synthetic construct
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*GP*AP*TP*GP*T)-3')C6synthetic construct
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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A, C
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
IOD
Query on IOD

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A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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C
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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A
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.422 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.149 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 81.377α = 90.00
b = 37.862β = 96.02
c = 61.835γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXphasing
HKL-2000data reduction
PDB_EXTRACTdata extraction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2018-06-09 
  • Released Date: 2018-08-15 
  • Deposition Author(s): Samara, N.L., Yang, W.

Revision History 

  • Version 1.0: 2018-08-15
    Type: Initial release