Crystal structure of RsgA from Pseudomonas aeruginosa

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.250 

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Structural and functional investigation of the Small Ribosomal Subunit Biogenesis GTPase A (RsgA) from Pseudomonas aeruginosa.

Rocchio, S.Santorelli, D.Rinaldo, S.Franceschini, M.Malatesta, F.Imperi, F.Federici, L.Travaglini-Allocatelli, C.Di Matteo, A.

(2019) FEBS J 286: 4245-4260

  • DOI: https://doi.org/10.1111/febs.14959
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Small Ribosomal Subunit Biogenesis GTPase A (RsgA) is a bacterial assembly factor involved in the late stages of the 30S subunit maturation. It is a multidomain GTPase in which the central circularly permutated GTPase domain is flanked by an OB domain and a Zn-binding domain. All three domains participate in the interaction with the 30S particle thus ensuring an efficient coupling between catalytic activity and biological function. In vivo studies suggested the relevance of rsgA in bacterial growth and cellular viability, but other pleiotropic roles of RsgA are also emerging. Here, we report the 3D structure of RsgA from Pseudomonas aeruginosa (PaRsgA) in the GDP-bound form. We also report a biophysical and biochemical characterization of the protein in both the GDP-bound and its nucleotide-free form. In particular, we report a kinetic analysis of the RsgA binding to GTP and GDP. We found that PaRsgA is able to bind both nucleotides with submicromolar affinity. The higher affinity towards GDP (K D  = 0.011 μm) with respect to GTP (K D  = 0.16 μm) is mainly ascribed to a smaller GDP dissociation rate. Our results confirm that PaRsgA, like most other GTPases, has a weak intrinsic enzymatic activity (k CAT  = 0.058 min -1 ). Finally, the biological role of RsgA in P. aeruginosa was investigated, allowing us to conclude that rsgA is dispensable for P. aeruginosa growth but important for drug resistance and virulence in an animal infection model. DATABASES: Coordinates and structure factors for the protein structure described in this manuscript have been deposited in the Protein Data Bank (https://www.rcsb.org) with the accession code 6H4D.

  • Organizational Affiliation

    Dipartimento di Scienze Biochimiche, "A Rossi Fanelli"- Sapienza Università di Roma, Italy.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Small ribosomal subunit biogenesis GTPase RsgA339Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: rsgAPA4952
EC: 3.6.1
Find proteins for Q9HUL3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HUL3 
Go to UniProtKB:  Q9HUL3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HUL3
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GDP

Download Ideal Coordinates CCD File 
C10 H15 N5 O11 P2
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.250 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 146.405α = 90
b = 146.405β = 90
c = 146.405γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-26
    Type: Initial release
  • Version 1.1: 2020-01-15
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description