Crystal Structure Of The tRNA Processing Enzyme Rnase pH From Pseudomonas Aeruginosa In Complex With Phosphate

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

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This is version 1.2 of the entry. See complete history


Probing the functional importance of the hexameric ring structure of RNase PH

Choi, J.M.Park, E.Y.Kim, J.H.Chang, S.K.Cho, Y.

(2004) J Biol Chem 279: 755-764

  • DOI: https://doi.org/10.1074/jbc.M309628200
  • Primary Citation of Related Structures:  
    1R6L, 1R6M

  • PubMed Abstract: 

    RNase PH is a phosphate-dependent exoribonuclease that catalyzes the removal of nucleotides at the 3' end of the tRNA precursor, leading to the release of nucleoside diphosphate, and generates the CCA end during the maturation process. The 1.9-A crystal structures of the apo and the phosphate-bound forms of RNase PH from Pseudomonas aeruginosa reveal a monomeric RNase PH with an alpha/beta-fold tightly associated into a hexameric ring structure in the form of a trimer of dimers. A five ion pair network, Glu-63-Arg-74-Asp-116-Arg-77-Asp-118 and an ion-pair Glu-26-Arg-69 that are positioned symmetrically in the trimerization interface play critical roles in the formation of a hexameric ring. Single or double mutations of Arg-69, Arg-74, or Arg-77 in these ion pairs leads to the dissociation of the RNase PH hexamer into dimers without perturbing the overall monomeric structure. The dissociated RNase PH dimer completely lost its binding affinity and catalytic activity against a precursor tRNA. Our structural and mutational analyses of RNase PH demonstrate that the hexameric ring formation is a critical feature for the function of members of the RNase PH family.

  • Organizational Affiliation

    National Creative Research Initiative Center for Structural Biology and Department of Life Science, Pohang University of Science and Technology, Hyo-ja dong, San31, Pohang, KyungBook 790-784, South Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuclease PH239Pseudomonas aeruginosaMutation(s): 0 
Gene Names: RPH
Find proteins for P50597 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P50597 
Go to UniProtKB:  P50597
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP50597
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PO4

Download Ideal Coordinates CCD File 
O4 P
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.202α = 90
b = 110.202β = 90
c = 116.284γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-17
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance