4NON

Crystal structure of GDP-bound A143S mutant of the S. thermophilus FeoB G-domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 

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This is version 1.5 of the entry. See complete history


Literature

Structural and functional analysis of a FeoB A143S G5 loop mutant explains the accelerated GDP release rate.

Guilfoyle, A.P.Deshpande, C.N.Vincent, K.Pedroso, M.M.Schenk, G.Maher, M.J.Jormakka, M.

(2014) FEBS J 281: 2254-2265

  • DOI: https://doi.org/10.1111/febs.12779
  • Primary Citation of Related Structures:  
    4NON

  • PubMed Abstract: 

    GTPases (G proteins) hydrolyze the conversion of GTP to GDP and free phosphate, comprising an integral part of prokaryotic and eukaryotic signaling, protein biosynthesis and cell division, as well as membrane transport processes. The G protein cycle is brought to a halt after GTP hydrolysis, and requires the release of GDP before a new cycle can be initiated. For eukaryotic heterotrimeric Gαβγ proteins, the interaction with a membrane-bound G protein-coupled receptor catalyzes the release of GDP from the Gα subunit. Structural and functional studies have implicated one of the nucleotide binding sequence motifs, the G5 motif, as playing an integral part in this release mechanism. Indeed, a Gαs G5 mutant (A366S) was shown to have an accelerated GDP release rate, mimicking a G protein-coupled receptor catalyzed release state. In the present study, we investigate the role of the equivalent residue in the G5 motif (residue A143) in the prokaryotic membrane protein FeoB from Streptococcus thermophilus, which includes an N-terminal soluble G protein domain. The structure of this domain has previously been determined in the apo and GDP-bound states and in the presence of a transition state analogue, revealing conformational changes in the G5 motif. The A143 residue was mutated to a serine and analyzed with respect to changes in GTPase activity, nucleotide release rate, GDP affinity and structural alterations. We conclude that the identity of the residue at this position in the G5 loop plays a key role in the nucleotide release rate by allowing the correct positioning and hydrogen bonding of the nucleotide base.


  • Organizational Affiliation

    Structural Biology Program, Centenary Institute, Sydney, New South Wales, Australia; Faculty of Medicine, Central Clinical School, University of Sydney, New South Wales, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferrous iron uptake transporter protein B
A, B
260Streptococcus thermophilus LMG 18311Mutation(s): 1 
Gene Names: feoB
UniProt
Find proteins for Q5M586 (Streptococcus thermophilus (strain ATCC BAA-250 / LMG 18311))
Explore Q5M586 
Go to UniProtKB:  Q5M586
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5M586
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.684α = 90
b = 120.768β = 93.99
c = 49.291γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
PHENIXrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-02
    Type: Initial release
  • Version 1.1: 2014-04-23
    Changes: Database references
  • Version 1.2: 2014-05-14
    Changes: Database references
  • Version 1.3: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.4: 2019-08-14
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-02-28
    Changes: Data collection, Database references, Derived calculations