2BMV

Apoflavodoxin from Helicobacter pylori


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Common Conformational Changes in Flavodoxins Induced by Fmn and Anion Binding: The Structure of Helicobacter Pylori Apoflavodoxin.

Martinez-Julvez, M.Cremades, N.Bueno, M.Perez-Dorado, I.Maya, C.Cuesta-Lopez, S.Prada, D.Falo, F.Hermoso, J.A.Sancho, J.

(2007) Proteins 69: 581

  • DOI: 10.1002/prot.21410
  • Primary Citation of Related Structures:  
    2BMV

  • PubMed Abstract: 
  • Flavodoxins, noncovalent complexes between apoflavodoxins and flavin mononucleotide (FMN), are useful models to investigate the mechanism of protein/flavin recognition. In this respect, the only available crystal structure of an apoflavodoxin (that f ...

    Flavodoxins, noncovalent complexes between apoflavodoxins and flavin mononucleotide (FMN), are useful models to investigate the mechanism of protein/flavin recognition. In this respect, the only available crystal structure of an apoflavodoxin (that from Anabaena) showed a closed isoalloxazine pocket and the presence of a bound phosphate ion, which posed many questions on the recognition mechanism and on the potential physiological role exerted by phosphate ions. To address these issues we report here the X-ray structure of the apoflavodoxin from the pathogen Helicobacter pylori. The protein naturally lacks one of the conserved aromatic residues that close the isoalloxazine pocket in Anabaena, and the structure has been determined in a medium lacking phosphate. In spite of these significant differences, the isoallozaxine pocket in H. pylori apoflavodoxin appears also closed and a chloride ion is bound at a native-like FMN phosphate site. It seems thus that it is a general characteristic of apoflavodoxins to display closed, non-native, isoalloxazine binding sites together with native-like, rather promiscuous, phosphate binding sites that can bear other available small anions present in solution. In this respect, both binding energy hot spots of the apoflavodoxin/FMN complex are initially unavailable to FMN binding and the specific spot for FMN recognition may depend on the dynamics of the two candidate regions. Molecular dynamics simulations show that the isoalloxazine binding loops are intrinsically flexible at physiological temperatures, thus facilitating the intercalation of the cofactor, and that their mobility is modulated by the anion bound at the phosphate site.


    Related Citations: 
    • Towards a Nwe Therapeutic Target: Helicobacter Pylori Flavodoxin
      Cremades, N., Buen, M., Toja, M., Sancho, J.
      (2005) Biophys Chem 115: 267

    Organizational Affiliation

    Biocomputation and Complex Systems Physics Institute (BiFi), Universidad de Zaragoza, Unidad Asociada al IQFR-CSIC, Zaragoza, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FLAVODOXINA164Helicobacter pyloriMutation(s): 0 
Find proteins for O25776 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25776 
Go to UniProtKB:  O25776
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BEN
Query on BEN

Download CCD File 
A
BENZAMIDINE
C7 H8 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BENKd :  10000000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.61α = 90
b = 45.712β = 90
c = 86.652γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2018-05-30
    Changes: Data collection, Structure summary