3EFR

Biotin protein ligase R40G mutant from Aquifex aeolicus in complex with biotin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and functional studies of the biotin protein ligase from Aquifex aeolicus reveal a critical role for a conserved residue in target specificity

Tron, C.M.McNae, I.W.Nutley, M.Clarke, D.J.Cooper, A.Walkinshaw, M.D.Baxter, R.L.Campopiano, D.J.

(2009) J.Mol.Biol. 387: 129-146

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Biotin protein ligase (BPL; EC 6.3.4.15) catalyses the formation of biotinyl-5'-AMP from biotin and ATP, and the succeeding biotinylation of the biotin carboxyl carrier protein. We describe the crystal structures, at 2.4 A resolution, of the class I ...

    Biotin protein ligase (BPL; EC 6.3.4.15) catalyses the formation of biotinyl-5'-AMP from biotin and ATP, and the succeeding biotinylation of the biotin carboxyl carrier protein. We describe the crystal structures, at 2.4 A resolution, of the class I BPL from the hyperthermophilic bacteria Aquifex aeolicus (AaBPL) in its ligand-free form and in complex with biotin and ATP. The solvent-exposed beta- and gamma-phosphates of ATP are located in the inter-subunit cavity formed by the N- and C-terminal domains. The Arg40 residue from the conserved GXGRXG motif is shown to interact with the carboxyl group of biotin and to stabilise the alpha- and beta-phosphates of the nucleotide. The structure of the mutant AaBPL R40G in both the ligand-free and biotin-bound forms reveals that the mutated loop has collapsed, thus hindering ATP binding. Isothermal titration calorimetry indicated that the presence of biotin is not required for ATP binding to wild-type AaBPL in the absence of Mg(2+), and the binding of biotin and ATP has been determined to occur via a random but cooperative process. The affinity for biotin is relatively unaffected by the R40G mutation. In contrast, the thermodynamic data indicate that binding of ATP to AaBPL R40G is very weak in the absence or in the presence of biotin. The AaBPL R40G mutant remains catalytically active but shows poor substrate specificity; mass spectrometry and Western blot studies revealed that the mutant biotinylates both the target A. aeolicus BCCPDelta67 fragment and BSA, and is subject to self-biotinylation.


    Organizational Affiliation

    School of Chemistry, EaStCHEM, The University of Edinburgh, West Mains Road, King's Buildings, Edinburgh, Scotland, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Biotin [acetyl-CoA-carboxylase] ligase
A, B
233Aquifex aeolicus (strain VF5)Mutation(s): 1 
Gene Names: birA
Find proteins for O66837 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O66837
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
BTN
Query on BTN

Download SDF File 
Download CCD File 
A, B
BIOTIN
C10 H16 N2 O3 S
YBJHBAHKTGYVGT-ZKWXMUAHSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BTNKd: 8300 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.235 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.251α = 90.00
b = 79.928β = 90.00
c = 140.173γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-2000data collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance