Crystal structure of type-I LOG from Pseudomonas aeruginosa PAO1

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 

Starting Model: experimental
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Structural insight into molecular mechanism of cytokinin activating protein from Pseudomonas aeruginosa PAO1.

Seo, H.Kim, K.J.

(2018) Environ Microbiol 20: 3214-3223

  • DOI: https://doi.org/10.1111/1462-2920.14287
  • Primary Citation of Related Structures:  
    5ZBJ, 5ZBK, 5ZBL

  • PubMed Abstract: 

    Cytokinin (CK)-activating enzyme, called LOG, is a phosphoribohydrolase that hydrolyzes nucleotides into nucleobases and phosphoriboses. This reaction is a fascinating target for regulation of cellular active CK. However, misannotation of LOG as a lysine decarboxylase and the lack of detailed catalytic and substrate-binding mechanisms have prevented studies of LOG at a protein-level. In this study, we determined the crystal structure of PA4923 from Pseudomonas aeruginosa PAO1. The overall structure of PA4923 resembles those of type-I LOGs, and it exhibited phosphoribohydrolase activity against AMP. These observations indicated that PA4923 functions as an LOG. We also determined the PaLOG structure in complex with AMP and elucidated the detailed binding mode of LOG against the AMP substrate. Interestingly, PaLOG undergoes an open/closed conformational change upon binding AMP, during which the Glu74 residue located on the β3-β4 connecting loop flips 180° and moves 13 Å towards the AMP molecule. Structural and amino acid sequence comparisons of LOGs suggest that this conformational change upon substrate binding might be a common phenomenon in LOGs. In addition, based on our structural studies and the reported catalytic mechanism of nucleoside hydrolases, we proposed a catalytic mechanism for LOG in which an oxocarbenium ion-like transition state is formed.

  • Organizational Affiliation

    School of Life Sciences, KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative cytokinin riboside 5'-monophosphate phosphoribohydrolase203Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA4923
EC: 3.2.2
Find proteins for P48636 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P48636 
Go to UniProtKB:  P48636
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP48636
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.931α = 90
b = 97.917β = 90
c = 71.665γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-06-27
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references
  • Version 1.2: 2020-09-16
    Changes: Structure summary
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description