2VXA

H. halophila dodecin in complex with riboflavin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Dodecin is the Key Player in Flavin Homeostasis of Archaea.

Grininger, M.Staudtb, H.Johansson, P.Wachtveitl, J.Oesterhelt, D.

(2009) J.Biol.Chem. 284: 13068

  • DOI: 10.1074/jbc.M808063200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Flavins are employed to transform physical input into biological output signals. In this function, flavins catalyze a variety of light-induced reactions and redox processes. However, nature also provides flavoproteins with the ability to uncouple the ...

    Flavins are employed to transform physical input into biological output signals. In this function, flavins catalyze a variety of light-induced reactions and redox processes. However, nature also provides flavoproteins with the ability to uncouple the mediation of signals. Such proteins are the riboflavin-binding proteins (RfBPs) with their function to store riboflavin for fast delivery of FMN and FAD. Here we present in vitro and in vivo data showing that the recently discovered archaeal dodecin is an RfBP, and we reveal that riboflavin storage is not restricted to eukaryotes. However, the function of the prokaryotic RfBP dodecin seems to be adapted to the requirement of a monocellular organism. While in eukaryotes RfBPs are involved in trafficking riboflavin, and dodecin is responsible for the flavin homeostasis of the cell. Although only 68 amino acids in length, dodecin is of high functional versatility in neutralizing riboflavin to protect the cellular environment from uncontrolled flavin reactivity. Besides the predominant ultrafast quenching of excited states, dodecin prevents light-induced riboflavin reactivity by the selective degradation of riboflavin to lumichrome. Coordinated with the high affinity for lumichrome, the directed degradation reaction is neutral to the cellular environment and provides an alternative pathway for suppressing uncontrolled riboflavin reactivity. Intriguingly, the different structural and functional properties of a homologous bacterial dodecin suggest that dodecin has different roles in different kingdoms of life.


    Organizational Affiliation

    Department of Membrane Biochemistry, Max Planck Institute of Biochemistry, Martinsried, Germany. grininge@biochem.mpg.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DODECIN
A, B, C, D, E, F, G, H, I, J, K, L
72Halorhodospira halophila (strain DSM 244 / SL1)Mutation(s): 0 
Find proteins for A1WUH0 (Halorhodospira halophila (strain DSM 244 / SL1))
Go to UniProtKB:  A1WUH0
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
RBF
Query on RBF

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
RIBOFLAVIN
RIBOFLAVINE; VITAMIN B2
C17 H20 N4 O6
AUNGANRZJHBGPY-SCRDCRAPSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
RBFKd: 2500 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.251 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 85.760α = 90.00
b = 100.510β = 90.00
c = 100.470γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-05-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-10-30
    Type: Advisory, Data collection, Derived calculations, Other