2CCC

Complexes of Dodecin with Flavin and Flavin-like Ligands


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Dodecins: A Family of Lumichrome Binding Proteins.

Grininger, M.Zeth, K.Oesterhelt, D.

(2006) J Mol Biol 357: 842

  • DOI: https://doi.org/10.1016/j.jmb.2005.12.072
  • Primary Citation of Related Structures:  
    2CC6, 2CC7, 2CC8, 2CC9, 2CCB, 2CCC

  • PubMed Abstract: 

    Dodecin is a small dodecameric flavoprotein from Halobacterium salinarum that contains two flavins stacked between two tryptophan residues to form an aromatic tetrade. The functional properties of heterologously expressed dodecin were investigated by fluorescence spectroscopy, which allowed the determination of dissociation constants for a number of protein-ligand complexes. The values obtained were in the nanomolar to micromolar range and correlate positively with the ligand size. These data were supplemented by X-ray crystal structures of the apododecin and holocomplexes with lumichrome, lumiflavin, riboflavin and FMN at resolutions between 1.55 to 1.95 A to unravel a gating mechanism as the structural basis for the preferential binding of the small ligands lumichrome and lumiflavin. The detailed analysis of the dodecin manifold for preferential binding of lumichrome and lumiflavin provides insight on a subatom level into a protein's strategy to gain selectivity for low molecular mass compounds by steric restrictions rather than specific interactions. Investigations on the ligand composition of a wild-type dodecin crystal (1.32 A resolution) support conclusions of functional and structural investigations on heterologously expressed dodecin, and strongly suggest that lumichrome, a molecule associated with the flavin metabolism, is a ligand of dodecin in vivo. Studies on mutant protein and a Halorhodospira halophila homologue spread the idea of a lumichrome binding system as a possible "waste"-trapping device, widely distributed in prokaryotes.


  • Organizational Affiliation

    Max Planck Institute of Biochemistry, Department of Membrane Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
VNG1446H68Halobacterium salinarum R1Mutation(s): 0 
UniProt
Find proteins for B0R5M0 (Halobacterium salinarum (strain ATCC 29341 / DSM 671 / R1))
Explore B0R5M0 
Go to UniProtKB:  B0R5M0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB0R5M0
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LFN
Query on LFN

Download Ideal Coordinates CCD File 
F [auth A]LUMIFLAVIN
C13 H12 N4 O2
KPDQZGKJTJRBGU-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
CL
Query on CL

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D [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

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B [auth A],
E [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
C [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
LFN PDBBind:  2CCC Kd: 17.57 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: F 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.85α = 90
b = 142.85β = 90
c = 142.85γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
CCP4phasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-31
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description